1. In commercial vehicle layouts engine is located forward, rear or under floor mainly to
A. Better utilization of space
B. Increase fuel economy
C. Better weight distribution
D. Reduce the weight of chassis Answer: C
2. The type of air cycle used in diesel engine is called
A. Otto cycle
B. Carnot cycle
C. Diesel cycle
D. Rankine cycle Answer: C
3. During suction stroke the pressure inside the cylinder is
A. Equal to atmospheric pressure
B. Above atmospheric pressure
C. Above or below atmospheric pressure
D. Below atmospheric pressure Answer: D
4. During compression stroke the air is compressed according to
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Constant pressure process Answer: C
5. The heat is added in the cycle at
A. Constant pressure
B. Constant volume
C. Approximately constant pressure and constant volume Answer: C
6. The fuel injected when pressure in the cylinder reaches the point ……….. on the curve
A. 1
B. 2
C. 3
D. 4 Answer: C
7. The crankcase scavenging the the crankcase or underside of the piston acts as
A. An air compressor
B. A blower
C. A ventilator
D. A breather Answer: A.
8. The two-stroke engine has valve ports in the
A. Pistons
B. Cylinder walls
C. Piston rings Answer: B
9. The temperature of the piston will be more at
A. The piston walls
B. The crown of the piston
C. The skirt of the piston
D. The piston pin Answer: B
10. Connecting rods are generally of the following from
A. Forged round section steel
B. Cast steel triangular section
C. Forged square section steel
D. Forged I section steel Answer: D
11. For petrol engines the nominal compression ratio will vary between
A. 1 to 2:1
B. 18 to 21:1
C. 1 to 5:1
D. 7.5 to 8.5:1 Answer: D
12. For diesel engines the nominal compression ratio is from
A. 17 to 21:1
B. 7.5 to 8.5:1
C. 30 to 40:1
D. 1 to 5:1 Answer: A.
13. One of the major causes of FHP in an engine is
A. High speed
B. High volumetric efficiency
C. Piston-ring friction Answer: C
14. Engine torque is highest at
A. Low speed
B. Intermediate speed
C. High speed Answer: B
15. The maximum pressure of air fuel mixture at the end of compression in petrol engines varies from
A. 10-30 Kg/cm2 B. 30-100 Kg/cm2
C. 6-10 Kg/cm2
D. 100-1000 Kg/cm2 Answer: A.
16. When we lift a 10 kg weight, 3 metre we would be doing
A. 300 m kg of work
B. 3 m kg of work
C. 30 m kg of work Answer: C
17. The characteristic of an object which makes it resist any tendency to change its direction of motion is called
A. Inertia
B. Power
C. Internal energy Answer: A.
18. The maximum pressure of air at the end of compression in diesel engines is about
A. 10 Kg/cm2
B. 100 Kg/cm2
C. 300 Kg/cm2
D. 30 Kg/cm2 Answer: D
19. As the number of cylinders in multi cylinder engines increases the power to weight ratio ………
A. Remains the same
B. Increases
C. Becomes zero
D. Decreases Answer: B
20. The type of friction generally present in an automotive engine is
A. Viscous friction
B. Greasy friction
C. Dry friction Answer: A.
21. The fit of the piston to the cylinder is measured at the
A. Piston skirt
B. Piston head
C. Point of minimum diameter Answer: B
22. Vibration damper ……….
A. controls the torsional vibrations
B. drives the pulley
C. dampens the engine speed
D. reduces the speed of the flywheel Answer: A.
23. In a six cylinder engine there is balance of
A. Primary forces only
B. Secondary forces only
C. Both primary and secondary forces Answer: C
24. If the connecting rod longer, the side thrust of the piston is
A. Increased
B. Constant
C. Decreased Answer: C
25. In general the design of the current regulator is such that its main actuating winding carries full
A. Generator voltage
B. Generator output
C. Field current
D. Battery voltage Answer: B
26. Immediately after ignition, combustion chamber temperatures may reach a value of
A. 15000C
B. 55000C
C. 25000C
D. 75000C Answer: A.
27. The compression ratio in a diesel engine is as high as
A. 25:1
B. 20:1
C. 10:1
D. 5:1 Answer: B
28. The temperature of the compressed air should be ………….. of the fuel
A. Below the flash point
B. Above the flash point
C. Above the fire point
D. Between the fire and flash point Answer: C
29. The compression pressure in diesel engine is around
A. 30 Kg/cm2
B. 10 Kg/cm2
C. 20 Kg/cm2
D. 40 Kg/cm2 Answer: A.
30. The combustion process in a diesel engine is
A. Constant pressure process
B. Isothermal process
C. Constant volume process
D. Adiabatic process Answer: A.
31. Which type of valve arrangements require the use of rocket arms?
A. H – head
B. T – head
C. I – head
D. L – head Answer: C
32. The conventional mechanical type fuel pump develops …………. pressure
A. 0.15 Kg/cm2
B. 1.0 Kg/cm2
C. 0.5 Kg/cm2
D. 0.3 Kg/cm2 Answer: B
33. As compression ratio in an engine goes up, the octane requirements of the fuel
A. Goes down
B. Goes up
C. Stay about the same Answer: B
34. The metering rod is designed to vary the size of which jets
A. High speed jets
B. Accelerating jets
C. Float level jets
D. Idle jets Answer: A.
35. The turbulence in diesel engines ensures to
A. Increase the volumetric efficiency
B. Increase the compression ratio
C. Bring the fuel quickly in contact with the air
D. Increase the specific fuel consumption Answer: C
36. If compression ratio is increased
A. Thermal efficiency will be increased
B. Volumetric efficiency will be increased
C. Air standard efficiency will be decreased
D. Air standard efficiency will be increased Answer: D
37. In ‘V’ type engines the included angle between two banks of cylinders is
A. 450
B. 600
C. 1300
D. 900 Answer: D
38. The duration of the fuel injection at full load in a diesel engine running at 1800 rpm when it has 200 of crank travel is
A. 1/600 sec
B. 1/640 sec
C. 1/540 sec
D. 1/530 sec Answer: C
39. Comparing a Four wheel drive with Two wheel drive system either at front or rear and assuming an equal division of weight between the two axes
A. From the point of view of traction front wheel drive is better than rear wheel drive
B. Front wheel and rear wheel drive are equal
C. Four wheel drive can always give more traction than either rear or front wheel drive
D. Four wheel drive can utilize all the weight of the vehicle only at a particular road friction Answer: C
40. The range of gear ratios in a vehicle depends on
A. The ratio of engine h.p to laden weight of vehicle
B. Max. engine torque / wt. of vehicle
C. Only on the laden weight of vehicle
D. The power to weight ratio of engine Answer: B
41. Most of the mopeds in India have capacity of
A. 10 cc
B. 250 cc
C. 50 cc
D. 175 cc
e. 150 cc Answer: C
42. Which motor cycle has maximum power rating
A. Rajdoot
B. Jawa
C. Yamaha
D. Bullet Answer: C
43. During a collision the front parts of an automobile are subjected to a deceleration of about ……… at about 50 mphr
A. 100g
B. 1000g
C. 1g
D. 10g Answer: C
44. Piston displacement is calculated from the
A. Cylinder diameter and length
B. Piston length and diameter
C. Bore and stroke Answer: C
45. The power used in overcoming friction in the engine is called
A. FHP
B. BHP
C. IHP Answer: A.
46. During combustion the pressure in the cylinder may increase to as much as
A. 50 Kg/cm2
B. 400 Kg/cm2
C. 10 Kg/cm2 Answer: A.
47. The size of intake valve is
A. Smaller than that of the exhaust valve
B. Equal to that of the exhaust valve
C. Larger than that of the exhaust valve
D. Not depending upon the size of exhaust valve Answer: C
48. A negative loop in the P.V diagram of an I.C engine is due to
A. Pre ignition in the engine
B. Suction of air for engine
C. Pre opening of the exhaust valve
D. High pressure in the cylinder Answer: B
49. Two stoke engine is preferred for small vehicles because
A. Fuel consumption is low
B. Shock and vibrations are less
C. Its size is small
D. It is easy to control Answer: C
50. Knowing the speed at which an engine is running and the torque it is developing, we can calculate
A. FHP
B. IHP
C. BHP Answer: A.
51. The radiator tubes are manufactured by using
A. Cast iron tubes
B. Aluminum tubes
C. Brass tubes
d .Steel tubes Answer: C
52. If we know the engine speed, bore, stroke, number of cylinders and m.e.p in the cylinders, we can calculate
A. FHP
B. IHP
C. BHP Answer: B
53. Knowing the IHP and FHP of an engine, we can calculate
A. Compression ratio
B. rpm
C. SAF
D. BHP Answer: D
54. Which one of the following is not a trade name of tractor in India
A. Kirloskar
B. Escort
C. Standard
D. HMT Answer: C
55. The ratio between the power output of an engine and the energy in the fuel burned to produce that power is called
A. Volumetric efficiency
B. Thermal efficiency
C. Mechanical efficiency Answer: B
56. The air volume in the cylinder with the piston at B.D.C divided by the clearance volume is called
A. Compression ratio
B. Piston displacement
C. Cylinder ratio Answer: A
57. The power used in overcoming friction in the engine is called
A. BHP
B. IHP
C. FHP Answer: C
58. The average pressure during the power stroke minus the average pressure during the intake, compression and exhaust strokes is called
A. IHP
B. Compression ratio
C. BHP
D. m.e.p Answer: D
59. IHP minus FHP equals
A. BHP
B. SAF HP
C. m.e.p Answer: A
60. Engine torque is highest at
A. High speed
B. Low speed
C. Intermediate speed Answer: C
61. BHP divided by IHP is
A. Thermal efficiency
B. Mechanical efficiency
C. Volumetric efficiency Answer: B
62. The percentage of the energy in the petrol burnt in the engine which is actually utilized in propelling the car is as little as
A. 25%
B. 60%
B. 35%
D. 15% Answer: A
63. In the diesel engine, the compression ratio is as high as
A. 10:1
B. 15:1
C. 5:1 Answer: B
64. The device for smoothing out the power impulses from the engine is called the
A. Flywheel
B. Camshaft
C. Crankshaft
D. Clutch Answer: A
65. The amount of air fuel mixture taken in by the engine on the suction stroke is a measure of the engine’s
A. Compression ratio
B. Volumetric efficiency
C. Clearance volume Answer: B
66. The size of an engine cylinder is referred to in terms of its
A. Diameter and bore
B. Bore and length
C. Bore and stroke Answer: C
67. In an operating engine, the hottest part of the piston is the
A. Head
B. Ring grooves
C. Skirt
D. Pin bosses Answer: A
68. In normal operation the part of the exhaust valve that gets the hottest is
A. Face
B. Middle of Stem
C. Centre of head
D. Edge of margin Answer: C
69. The power developed inside the engine cylinder is called
A. IHP
B. FHP
C. BHP Answer: A
70. The ratio of the cylinder volume at BDC and the clearance volume is called
A. Clearance ratio
B. Volumetric ratio
C. Compression ratio Answer: C
71. As a rule when comparing the front and rear wheel cylinder pistons, it will be found that the pistons in the front wheel cylinders are
A. The same size
B. Larger in diameter
C. Smaller in diameter Answer: B
72. Twisting and untwisting of the crankshaft is called
A. Torsional vibration
B. Power impulsion
C. Torsional balance Answer: A
73. The rotating effect of the connecting rod on the connecting rod bearing produces
A. Pressure load
B. Inertia load
C. Centrifugal load Answer: C
74. Important bearing characteristics include
A. Embeddability, compression and fatigue
B. Exbeddability, conformability and fatigue resistance Answer: B
75. In the engine there must be relative motion between the piston and the connecting rod
A. Atmospheric pressure, inertia and torsional vibration
B. Centrifugal force, inertia and combustion pressure
C. Inertia, engine speed and centrifugal force Answer: B
76. Two of the three connecting rod bearing loads that increase as engine speeds increase are
A. Centrifugal and inertia loads
B. Torsional and pressure loads
C. Pressure and inertia loads
D. Pressure and centrifugal loads Answer: A
77. When different forces act at angles on connecting rod bearing, the combining of these forces produces a
A. Remaining force
B. Canceling force
C. Resultant force Answer: C
78. The active material in a charged negative plate is
A. Lead sulphate
B. Lead peroxide
C. Lead metal
D. Lead per chloride Answer: C
79. The tree general types of friction bearings are
A. Journal, ball and roller
B. Journal, guide and thrust
C. Journal, shaft and thrust Answer: B
80. Petrol and Gasoline is called a hydrocarbon because it consists essentially of
A. Carbon and Hydrogen
B. Oxygen and Hydrogen
C. Carbon and Oxygen Answer: A
81. Almost all bearing used in automotive engines are
A. Guide bearings
B. Friction bearings
C. Antifriction bearings Answer: B
82. The brake shoes are curved to conform to the inner diameter of the
A. Tyre
B. Wheel
C. Pedal
D. Brake drum Answer: D
83. It is cheaper if we use gaskets of
A. Rubber asbestos type
B. Copper asbestos type
C. Steel asbestos type Answer: A
84. With an increase in temperature the resistance of carbon is
A. Unchanged
B. Decreased
C. Increased Answer: C
85. When petrol burns completely, two of the compounds that are formed are
A. Carbon dioxide and water
B. Water and oxygen
C. Hydrocarbon and oxygen Answer: A
86. Due to heat of combustion, with increase in temperature the molecules
A. Move slower
B. Vaporize
C. Move faster Answer: C
87. When air is heated, it
A. Contracts and becomes heavier
B. Expands and becomes heavier
C. Expands and becomes lighter Answer: C
88. Changing position of an object against an opposing force is called
A. Power
B. Torque
C. Energy
D. Work Answer: D
89. A liquid that boils at a relatively high temperature is said to have
A. A low viscosity
B. A high viscosity
C. A high volatility
D. A low volatility Answer: D
90. The ease with which a liquid changes to a vapour is called its
A. Vapourability
B. Boiling point
C. Viscosity
D. Volatility Answer: D
91. The pump part that rotates and causes water circulation between the radiator and engine is called
A. Impeller
B. Fan
C. Bypass Answer: A
92. The bearing having the least friction is the
A. Sleeve bearing
B. Antifriction bearing
C. Friction bearing Answer: B
93. Conform ability of an engine bearing is
A. Ability of a bearing to withstand the wear and tear
B. Resistivity to corrosion
C. Ability of the bearing to adjust itself to variations in shaft alignment and journal shape
D. Ability of a bearing to permit foreign particles to embed in it Answer: C
94. The most commonly used material for tyre tubes is
A. Butyl
B. Natural rubber
C. Butane Answer: A
95. When the plates of battery cell are made larger in size, we get increased …………
A. Current
B. Voltage
C. Cell resistance Answer: A
96. When preparing electrolyte, it is important to remember that
A. Acid and water should be poured together
B. Water should be poured into acid
C. Acid should be poured into water Answer: C
97. Aluminium alloy pistons are preferred because
A. They are good absorbers of shock
B. They are having less weight
C. They have good water resistance
D. They are very strong in tension Answer: B
98. The material used for the piston of modern passenger cars are
A. Brass pistons
B. Cast iron pistons
C. Aluminiun alloy pistons
D. Steel pistons Answer: C
99. Piston compression rings are manufactured by
A. Aluminium
B. Cast iron
C. Steel
D. Bronze Answer: B
100. Gudgeon pins or piston pins are made by
A. Piston material itself
B. Cork
C. Cast iron
D. Hardened and ground steel Answer: D
101. The brake pipe in hydraulic brakes is made up of
A. PVC
B. Steel
C. Rubber
D. Copper Answer: B
102. The ease with which a liquid vapourizes is called its
A. Volatility
B. Octane rating
C. Vapourability Answer: A
103. As the battery is discharged, the active materials in both negative and positive plates are changed to
A. Spongy lead
B. Sulphuric acid
C. Lead oxide
D. Lead sulphate Answer: D
104. The pipes used in diesel engines from pump to nozzle is made up of
A. PVC
B. Rubber
C. Steel
D. Copper Answer: C
105. Two types of antifreeze are
A. Iso octane and ethylene glycol
B. Alcohol base and ethylene glycol
C. Ethylene glycol and propylene glycol Answer: B
106. The substance added to the oil which helps to keep the engine clean is called
A. Grease
B. Thickening agent
C. Soap
D. Detergent Answer: D
107. One advantage of using an exhaust valve as insert is that the ring
A. Withstands high exhaust gas temperature better
B. Is more easily machined
C. Wears in more quickly Answer: A
108. The crankshafts are usually forged to get
A. Minimum friction effects
B. A good mechanical design
C. Good grain structure
D. Improved corrosion structure Answer: B
109. The number of parallel paths in a lap winding of the armature of a DC generator is equal to
A. Half the number of poles
B. Number of poles
C. Two Answer: B
110. The unsprung mass in a vehicle system is mainly composed of
A. The frame assembly
B. Gear box and propeller shaft
C. Axle and the parts attached to it
D. Engine and associated parts Answer: C
111. Parts of the shock absorber include
A. Valves
B. Coupler
C. Valve springs
D. Pistons Answer: A
112. The automobile chassis consists of the engine, frame, power train, wheels, steering and …………..
A. The doors
B. Luggage boot
C. Wind shield
D. Braking system Answer: D
113. The frame provides support for the engine body, power train members and …….
A. Wheels
B. Jack
C. Road Answer: A
114. The engine is usually supported by the frame
A. Four or five
B. One or two
C. Three or four
D. One or two Answer: C
115. The central part of the axle beam is offset downwards to
A. Give improved resistance to end thrusts during cornering
B. Give better bending strength
C. Give improved torsional strength during brake application
D. Clear the engine sump and lower vehicle centre of gravity Answer: D
116. X – member of a car frame ensures improved
A. Resistance to side force due to transverse wind load
B. Bending strength of side members
C. Resistance to vertical shock loads acting simultaneously on both front wheels
D. Resistance of weaving and torsional strength of front end of frame Answer: A
117. The purpose of the shock absorbers is to
A. Strengthen frame
B. Damp spring oscillations
C. Improve rigidity of spring mountings Answer: B
118. The rear end suspension arrangement in which rear end torque is absorbed by the spring is called the
A. Torque tube drive
B. Hooks drive
C. Differential drive
D. Hotchkiss drive Answer: D
119. On rebound, in the direct acting shock absorber, fluid flows out of the upper part of the cylinder and also ………..
A. Out of the dust shield
B. Out of the reservoir
C. Into the reservoir
D. Into the dust shield Answer: B
120. The weight or pressure required to deflect a spring in mm is called the spring
A. Weight
B. Deflection
C. Rate
D. Rebound Answer: C
121. Leaf spring for vehicles are nipped to
A. To vary the effective length of the spring
B. To increase the interleaf friction
C. Improve the load carrying capacity of spring
D. Ensure that all leaves are uniformly stressed during loading Answer: D
122. The device that permits variation in the distance between the spring eyes of a leaf spring as the spring flexes is called
A. Spring shackle
B. Spring U – bolt
C. Spring hanger
D. Spring leaf Answer: A
123. When the direct acting shock absorber is compressed or telescoped fluid passes through the piston orifices into the upper part of the cylinder and also
A. Into the dust shield
B. Out of the dust shield
C. Into the reservoir
D. Out of the reservoir Answer: C
124. The clips placed at intervals along some leaf spring to prevent spring leaf separation on rebound, are called
A. Rebound clips
B. Separation clips
C. Interval clips
D. Relief clips Answer: A
125. In a vehicle with torque tube drive, the rear suspension spring
A. Takes up driving thrust and torque reaction
B. Supports load and takes up end thrust
C. Takes up braking thrust and torque reaction
D. Takes up end thrust and torque reaction Answer: B
126. With a leaf spring type of suspension, interference between steering and suspension system can be reduced to minimum when
A. Front end of the spring is pin joined and the rear end is shackled
B. Front end of the spring is shackled and rear end is pin jointed
C. Both end of the spring are shackled
D. Both ends of the springs are pin jointed Answer: B
127. The laminated spring, which is in common use, is of the type
A. Full elliptic
B. Semi elliptic
C. One quarter elliptic
D. Three quarter elliptic Answer: B
128. A double acting shock absorber usually has
A. Unequal pressure acting on either sides
B. Equal pressure on either side
C. Pressure acting only on one side Answer: A
129. Hotchkiss drive is the name associated with
A. A type of automatic transmission
B. The kind of drive for independent suspension axles
C. A means of taking up torque and thrust by leaf springs
D. A type of gear box Answer: B
130. The part of the vehicle holds the passengers and the cargo to be transported is known as
A. Hull
B. Chassis
C. Cabin
D. Sedan Answer: A
131. The power train includes the clutch, propeller shaft, differential and …………….
A. Steering gear
B. Front axles
C. Chassis
D. Transmission Answer: D
132. In gear systems, speed reduction means torque
A. Stabilization
B. Increase
C. Reduction Answer: B
133. Clutch slippage while clutch is engaged is particularly noticeable
A. When starting the engine
B. During acceleration
C. During idle
D. At low speed Answer: B
134. Clutch chattering or grabbing is noticeable
A. At low speed
B. When engaging the clutch
C. When accelerating
D. During idle Answer: D
135. Clutch noises are usually most noticeable when the engine is
A. Being started
B. Decelerating
C. Idling
D. Accelerating Answer: C
136. Synchronizing devices are designed to prevent gear clash when shifting into
A. First and second
B. Second and high
C. First and reverse Answer: B
137. The overdrive is located between the
A. Transmission and the propeller shaft
B. Planetary gears and clutch
C. Transmission and clutch Answer: B
138. The sun gear in the planetary gear system meshes with the
A. Pinion cage
B. Ring gear
C. Clutch gear
D. Planet pinions Answer: D
139. Pressing down on clutch pedal causes the release levers to move the pressure plate away from
A. Friction disc
B. Clutch cover
C. Pressure plate baffle
D. Throw out bearing Answer: A
140. In coil spring type of clutch the cover is separated by
A. Removing three screws or nuts
B. Unhooking three retainer springs
C. Removing wire coil springs
D. Detaching three lever springs Answer: A
141. In the high gear in the transmission, main shaft turns at the same speed as the
A. Idler shaft
B. Counter shaft
C. Clutch shaft Answer: C
142. The purpose of the fluid coupling is to act as a
A. Automatic gear changer
B. Flexible power transmitting coupling
C. Synchronizing device Answer: B
143. In the fluid coupling oil passes from the driving to the
A. Gear
B. Coupling
C. Vanes
D. Driven member Answer: D
144. Braking is produced by the frictional effect between the brake drum and the
A. Wheel studs
B. Wheel rim
C. Brake shoes
D. Wheel cylinder pistons Answer: C
145. The drive pinion in the over running clutch is moved into mesh for cranking action by
A. A shaft lever
B. Sleeve turning in pinion
C. Pinion inertia Answer: C
146. The function of a torque converter or fluid converter is similar to that of a
A. Gear box
B. Clutch
C. Shock absorber
D. Torsion box Answer: A
147. In the transmission system, the provision of slip joints allows a change in the
A. Angle of drive
B. Length of shaft
C. Speed of rotation Answer: B
148. In the torque converter, oil leaving the turbine is changed into a helping direction by curved
A. Pump vanes
B. Stator vanes
C. Turbine vanes Answer: B
149. In a fluid coupling the greater the difference between the speeds of the driving and the driven member
A. Higher the coupling efficiency
B. The lower the turbulence
C. The lower the coupling efficiency Answer: C
150. The ratio between the speed of the camshaft and the speed of the crankshaft is
A. 1:1
B. 1:4
C. 1:2
D. 1:1/4 Answer: B
151. The free wheeling mechanism contains
A. A planetary gear
B. A transmission
C. An over running clutch
D. A propeller shaft Answer: C
152. For each crankshaft revolution, the cam shaft revolves
A. one half-turn
B. one turn
C. two turns
D. four turns Answer: A
153. The overdrive is located between
A. Gear box and clutch
B. Gear box and propeller shaft
C. Planetary gears and clutch Answer: B
154. The synchronizing device used in the transmission uses
A. Cone braking surfaces
B. Flat braking surfaces
C. Synchronizing pins Answer: A
155. The second movement of the gear shift lever produces
A. The correct gears to mesh
B. The movement of the drive gear
C. Release of clutch Answer: A
156. There are two separate movements of the gear shift lever for changing the gears.
The first movement selects
A. The shaft to be moved
B. The shaft pedal to be moved
C. Shifter fork which operates gear assembly to be moved Answer: C
157. The standard transmission has
A. One shifter fork
B. Two shifter forks
C. Three shifter forks
D. Four shifter forks Answer: C
158. The conventional motor car has
A. Two forward speeds
B. Three forward speeds
C. Four forward speeds Answer: C
159. In the transmission, the reverse idler gear always mesh with
A. Counter shaft drive gear
B. Counter shaft low gear
C. Main shaft reverse gear
D. Counter shaft reverse gear Answer: D
160. In transmission reduction of speed is always used to obtain
A. Reduction of torque
B. Constant torque to drive the wheels
C. Increase of torque Answer: C
161. The device that produces different gear ratios in the power train is called
A. Differential
B. Transmission
C. Speed Changer Answer: B
162. In the automobile, the power train carries the engine power from the engine to the rear wheels. The power train includes the clutch propeller shaft, differential and
A. Front axis
B. Steering gear
C. Gear box
D. Chassis Answer: C
163. In the coil spring type of clutch when the pressure plate and cover are separated, the spring pressure must be held by
A. Hand
B. An arbor press
C. A lever
D. A heavy weight Answer: B
164. Parts of the clutch that should not be cleaned in solvent include the
A. Friction disc and throw out bearing
B. Friction disc cover
C. Throw out bearing and springs
D. Release levers and springs Answer: A
165. On diaphragm spring clutch, pressing down on the clutch pedal moves throw out bearing in against the
A. Release levers
B. Diaphragm
C. Pressure plate
D. Friction disc Answer: A
166. As a general rule in facings on the friction disc are worn down to the rivet heads
A. Rivets should be
replaced
B. The friction disc should be replaced
C. The clutch should be replaced
D. The linkage should be adjusted Answer: B
167. The front end of the clutch shaft is supported in a pilot bearing in the
A. Throw out bearing
B. Friction disc
C. Crankshaft
D. Transmission Answer: C
168. The three forward speed and the reverse transmission consists of three shafts and
A. Three gears
B. Five gears
C. Eight gears
D. Ten gears Answer: C
169. Synchromesh devices in the transmission synchronize the gears about to be
A. Meshed
B. De-meshed
C. Stopped Answer: A
170. In the transmission the counter shaft drive gear is meshed with a gear on the
A. Output shaft
B. Main shaft
C. Clutch shaft Answer: B
171. The fluid coupling is most efficient as drive ratio approaching to
A. 1:1
B. 2:1
C. 1:5:1
D. 1:3 Answer: A
172. In the fluid coupling speed reduction means
A. torque reduction
B. torque increase
C. power increase Answer: A
173. When the clutch is engaged, spring pressure clamps the friction disc between the pressure plate and the
A. Flywheel
B. Differential
C. Reaction plate
D. Clutch pedal Answer: A
174. The free travel of the medal, or pedal lash is the amount of travel the pedal has before the throw out bearing comes up against the
A. Release levers
B. Flywheel
C. Floor board
D. Stop Answer: A
175. The automobile transmission is removed from the car by taking it out
A. From under car
B. Through driving compartment
C. Through engine compartment Answer: A
176. Overdrive is provided in the transmission of a vehicle to
A. Reach higher road speeds
B. improved fuel consumption
C. achieve better acceleration
D. carry more load Answer: B
177. The number of gear ratios in a vehicle
A. Is more with high powered vehicle
B. Is less with high powered cars
C. Is more with diesel engine heavy vehicles
D. is more with petrol engine typical American Car Answer: A
178. In the process of gear shifting in a layshaft type of gearbox
A. An upchange say third to Top Gear requires speeding up of lay shaft
B. An up change requires slowing down the layshaft
C. An upchange or down change is not accompanied by changes in layshaft speed
D. Gear shifting involves change of speed only in down shifts Answer: B
179. A fluid coupling
A. Acts like flywheel and replaces it since as it is known also by the name fluid wheel
B. It takes the place of friction clutch and replaces it completely in synchromesh transmission systems
C. It replaces the friction clutch and the Gearbox also
D. Does the function of a clutch automatically, but cannot be used for shifting transmission to effect Gear changes Answer: D
180. The main advantage of a fluid coupling is
A. In its low torque capacity at low speeds
B. Steady state torque characteristic
C. Due to its ability to slip
D. Due to its ability to function fluid medium Answer: C
181. The hydrodynamic torque converter
A. Gives a continuous variation of torque with increase of output speed
B. Enables to get the max. h.p continuously
C. Gives a speed variation without torque variation
D. Maintains a high efficiency throughout the operating speed range Answer: A
182. An automatic transmission works on the principle of
A. Centrifugal device making up changes proportional to road speed
B. Centrifugal device connected to crankshaft making up changes prop. to engine speed
C. Makes changes depending on throttle position in conjunction with road speed governor
D. Makes gear changes at equal intervals or set road speeds Answer: C
183. The coil springs are located in between the pressure plate and the
A. Clutch cover
B. Disc assembly
C. Pressure plate baffle
D. Flywheel Answer: A
184. The clutch cover is bolted to the
A. Friction disc
B. Flywheel
C. Car frame
D. Engine block Answer: B
185. The friction disc is positioned between the flywheel and the
A. Engine
B. Crankshaft
C. Pressure plate Answer: C
186. There is a double faced friction disc splined to a shaft in the
A. Transmission
B. Differential
C. Engine
D. Clutch Answer: D
187. To prevent distortion on re-installation on the clutch cover attaching bolts should be tightened
A. One at a time
B. Evenly
C. Until springs begin to compress
D. Until springs are expanded Answer: B
188. The power train transmits power from the engine to the
A. Crank shaft
B. Rear wheels
C. Front wheels
D. Steering gear Answer: B
189. The clutch pressure plate is mounted on the
A. Flywheel
B. Clutch cover
C. Friction disc
D. Crankshaft Answer: B
190. The release levers in a typical clutch pivot on
A. Springs
B. Levers
C. Threaded levers
D. Pins Answer: D
191. If two meshing gears have 4:1 gear ratio and the smaller gear has 12 teeth, the large gear will have
A. 12 teeth
B. 24 teeth
C. 36 teeth
D. 48 teeth Answer: D
192. The two meshed gears have a gear ratio of 3:1. Every time the larger gear turns once the small gear will
be to turn
A. 1/3 time
B. one
C. three times Answer: C
193. In the diaphragm clutch inward movement of the throw out bearing causes the diaphragm spring to
A. Dish inward
B. Expand
C. Contract Answer: A
194. The fluid coupling has maximum efficiency when driving and driven members are turning at
A. High speed
B. Low speed
C. Different speed
D. About the same speed Answer: A
195. The purpose of the guide ring in the fluid coupling is to reduce oil
A. Movement between the members
B. Turbulence
C. Level in coupling Answer: B
196. Synchronizing is designed to prevent gear clash when shifting into
A. First and reverse
B. First and second
C. Second and high Answer: C
197. When shifting into low, a gear on the transmission main shaft is moved in to mesh with the
A. Counter shaft low gear
B. Counter shaft idler
C. Clutch gear
D. Output gear Answer: A
198. Clutch noises are usually most noticeable when the engine is
A. Accelerating
B. Decelerating
C. Idling
D. Being started Answer: C
199. Clashing of gears when shifting into high could result from
A. Engine misalignment
B. Drive key sheared
C. A defective Synchronizer Answer: C
200. Transmission noise in neutral could result from
A. Worn gears
B. Loose propeller shaft
C. Misadjusted gear linkage Answer: A
201. The purpose of the fluid coupling is to act as a
A. Synchronizing device
B. Automatic gear changer
C. Flexible power-transmitting coupling Answer: C
202. The distance between adjacent meshing teeth of mating gears is called
A. Clearance
B. Back lash
C. Flank Answer: B
203. In the fluid coupling, speed reduction means torque reduction. But in the torque converter, speed reduction means
A. Torque increase
B. Torque loss
C. Power increase Answer: A
204. The fluid coupling consists essentially of two
A. Doughnuts
B. Vane members
C. Guide rings
D. Driving shafts Answer: B
205. The number of planetary gear sets in a hydromatic transmission system is
A. Two
B. Three
C. Four
D. Five Answer: C
206. When coming out of overdrive, the overdrive electric control momentarily
A. De clutches the engine
B. Interrupts the ignition system action
C. De meshes the sun gear Answer: B
207. In order for power to flow through the fluid coupling from the engine to car wheels, the driving member must be turning
A. Slower than driven member
B. At same speed as driven member
C. Faster than driven member Answer: C
208. In the overdrive, there is an arrangement whereby it is possible to lock stationary the
A. Ring gear
B. Sun gear
C. Planet pinion cage Answer: B
209. The coil spring clutch may use from
A. Two to six springs
B. Three to nine springs
C. Four to eight springs
D. Ten to twelve springs Answer: B
210. If the differential noise is present only when the car is rounding a curve the trouble would be due to
A. Heavy heel contact on gear teeth
B. Heavy toe contact on gear teeth
C. Binding in differential case Answer: C
211. To correct heavy flank contact on the ring gear teeth
A. Move the drive pinion in
B. Move the drive pinion out
C. Move the ring gear out
D. Adjust back lash as necessary Answer: C
212. The ring gear is adjusted in the differential by use of
A. Selective washers of proper thickness
B. Bearing adjuster
C. Adjusting screws Answer: A
213. The axle bevel gears in the differential mesh with the
A. Differential pinion gears
B. Ring gear
C. Drive pinion
D. Main gear Answer: A
214. The ring gear is mounted on the
A. Differential housing
B. Differential carrier
C. Differential case
D. Axle housing Answer: D
215. The outer end of the axle is supported by a
A. Spring seat
B. Sleeve bearing
C. Housing bracket
D. Ball or roller bearing Answer: D
216. When the axle is pulled the bearing
A. Stays in the housing
B. Stays in the differential
C. Comes out with it Answer: A
217. In the differential the ring gear is bolted to the
A. Differential housing
B. Differential case
C. Axle housing
D. Drive pinion Answer: B
218. The slip joint permits a change in the
A. Length of shaft
B. Speed of rotation
C. Angle of drive Answer: A
219. The centre part of a typical universal joint is called the
A. Trunnion
B. Joint
C. Bearing
D. Spider Answer: D
220. To take care of the difference in the driving angle as rear axle moves up and down, the propeller shaft has one or more
A. Slip joint
B. Elbow joint
C. Release joint
D. Universal joints Answer: D
221. In the modern differential, the type of gearing used for the drive pinion and ring gear is
A. Spur
B. Spiral bevel
C. Hypoid Answer: C
222. The propeller shaft has one or more
A. Spur gears
B. Elbow joints
C. Universal joints
D. Fluid couplings Answer: C
223. There is a tendency for the rear axle housing to rotate in a direction opposite to the direction of the rear wheels and this effect is due to
A. The torque tube
B. Acceleration
C. Rear end torque Answer: C
224. In the slip joint, slippage occurs between internally and externally mated
A. Couplings
B. joints
C. Splines Answer: C
225. If a noise is present in a differential only when the car moves past a curve, the chances are that the trouble is due to some fault in
A. Drive pinion assembly
B. Differential case assembly
C. Wheel bearing Answer: B
226. In the differential to correct for heavy face contact on the drive gear teeth, it is necessary to move the
A. Drive pinion in
B. Drive pinion out
C. Drive gear out and then adjust backlash Answer: A
227. In the differential, to correct for heavy flank contact on the drive gear teeth, it is necessary to move the
A. Drive pinion in
B. Drive pinion out
C. Drive gear out and then adjust back lash Answer: C
228. In the differential, to correct for heavy heel contact on the drive gear teeth, it is necessary to move the
A. Drive pinion in
B. Drive gear towards pinion
C. Drive gear away from pinion and adjust back lash Answer: A
229. In the differential, to correct for heavy toe contact on the drive gear teeth, it is necessary to move the
A. Drive gear towards pinion
B. Drive pinion gear away from pinion
C. Drive pinion out and adjust back lash Answer: C
230. The drive gear in the differential is adjusted by use of
A. Selective washers of proper thickness
B. Adjustment nuts
C. Adjustment screws Answer: A
231. The type of rear axle in which the wheel end is supported by bearings inside the axle housing is
A. Semi floating axle
B. Three-quarter floating axle
C. Full-floating axle Answer: A
232. The two basic types of axle are
A. Dead and floating
B. Dead and live
C. Floating and semi floating Answer: B
233. In the differential, the ring gear is bolted to the
A. Differential housing
B. Differential case
C. Drive pinion
D. Axle shaft Answer: B
234. In the Hotchkiss drive, the rear end torque is absorbed by the
A. Torque tube
B. Rear springs
C. Radius rods Answer: B
235. The universal joint permits a change in the
A. Length of the shaft
B. Speed of rotation
C. Angle of drive Answer: C
236. To correct heavy heel contact on the ring gear teeth, move the
A. Drive pinion in
B. Ring gear towards pinion
C. Ring gear away from pinion and adjust backlash Answer: A
237. Propeller shaft includes
A. Universal joint
B. Knee joint
C. Slip joint Answer: A
238. A humming noise in the differential is often caused by improper tooth contact between the
A. Drive pinion & ring gear
B. Axle and side gear
C. Pinion and side gears Answer: A
239. Axle shaft of the three-quarter floating axle is subjected to
A. Bending stress only
B. Torsional stress only
C. Bending and torsional stress
D. Torsional stress and stress due to axial force during cornering Answer: B
240. Whirling of the propeller shafts is mainly due to
A. The transmission of torsional vibration of the crankshaft
B. The use of a sliding joint in the propeller shaft
C. The use of universal joints in the drive
D. Lack of balance and excessive length of propeller shaft Answer: D
241. In a vehicle with dual rear axle, the wheel base is measured from the
A. Axis of the front wheel to the nearest rear wheel axis
B. Axis of the front wheel to the farthest rear wheel axis
C. Rear of cab to farthest rear wheel axis
D. Axis of the front wheel to an axis midway between the axes of rear wheels Answer: C
242. The axle shaft of a semi floating rear axle is subjected to
A. Axial thrust only
B. Axial thrust and bending stress
C. Torsional stress only
D. Bending, torsional stresses and end thrust Answer: D
243. Differential mechanism at the axle is provided mainly to
A. Enable the vehicle go round corners
B. Equalize the division of torque between the two wheels C. To provide a reduction ratio
D. To turn the drive through a right angle Answer: A
244. De Dion axle is usually
A. Used at the front of heavy vehicles
B. A kind of axle in which the differential and final drive gears are supported in the frame
C. A two speed axle drive suited for heavy vehicles
D. The popular drive for 2 wheeler Answer: B
245. Spur gear type of differential is unsuitable for passenger car applications because
A. It results in a very costly rear axle assembly
B. The large transmission losses due to spur gears
C. Large dimension of final drive housing resulting in reduced ground clearance
D. Centre of gravity of the vehicle is raised Answer: D
246. Floating axles are classified on the basis of
A. The amount of torque transmitted
B. Depending upon their location whether at front or rear
C. Depending on the nature of forces like torsional vertical and lateral to which they are subjected
D. Purely on the basis of type and number of bearings used at the work Answer: C
247. Which of the following layouts is not used in motor vehicles?
A. Front engine front drive
B. Front engine rear drive
C. Rear engine front drive
D. Rear engine rear drive Answer: C
248. The most popular drive at the drive axle for the passenger car is
A. Straight bevel gear
B. Spiral bevel gear
C. Worm gear drive
D. Hypoid drive Answer: D
249. The drive line consists of the propeller shaft with
A. Drive and universal joints
B. Universal joints and slip joints Answer: B
250. In the differential the ring gear is attached to the
A. Bevel gear
B. Drive gear
C. Differential case
D. Propeller shaft Answer: C
251. In trucks the system of wheel braking employed is
A. Mechanical
B. Hydraulic
C. Pneumatic Answer: C
252. In jeeps we use
A. Mechanical brakes
B. Hydraulic brakes
C. Air brakes Answer: B
253. In a vacuum type servo-assisted brake system, vacuum is available in …….. is made use of
A. Exhaust manifold
B. Combustion chamber
C. Water jackets
D. Inlet manifold Answer: D
254. The approximate ratio of effort applied : effort available from servo system is A. 1:1
B. 3:1
C. 1:4
D. 10:1 Answer: B
255. Due to continuous running on a hot day the temperature of the braking fluid will increase, hence some braking torque is applied on brake shoes, to avoid this a small quantity of fluid will be allowed to escape into the master cylinder through
A. Intake port
B. Exhaust port
C. Secondary port Answer: C
256. As the load on the vehicle increase it demands
A. Increased braking torque
B. Decreased braking torque
C. Same braking torque Answer: A
257. In the hydraulic brake system, the movement of a piston in the master cylinder produces hydraulic pressure which causes movement of
A. Brake shoe
B. Brake pedal
C. Brake cam Answer: A
258. In the case of brake linings saturants and bonding materials are used to
A. Facilitate moulding and curing of brake linings
B. To improve the heat dissipating capacity of linings
C. To give a constant coefficient of friction up to 800 C
D. To make the lining material impervious to moisture and oil and to ensure a steady coefficient of friction up to 3000 C Answer: A
259. Brake lining area required for shoe brakes for trucks is mainly based on
A. Average truck speed
B. Frequency of brake applications
C. Gross vehicle weight
D. Material used for brake drums Answer: C
260. The working fluid normally used in hydraulic brake systems is
A. High speed diesel oil along with alcohol
B. SAE 20 oil with anti-corrosion additives
C. A mixture of vegetable oil and SAE 10 oil
D. A solution of castor oil in alcohol along with neutralizer Answer: D
261. Movement of the brake pedal forces brake fluid from the master brake cylinder through brake lines and into the
A. Brake shoes
B. Wheel cylinders
C. Brakes cables
D. Pedal rod Answer: B
262. During braking the brake shoe is moved outward to press against the
A. Wheel piston or cylinder
B. Brake lining
C. Brake drum or disc
D. Wheel rim or axle Answer: C
263. In the hydraulic brake system, movement of a piston in the master cylinder produces hydraulic pressure which causes movement of the
A. Wheel cylinder pistons
B. Brake pedal
C. Brake cam Answer: A
264. The radius of a pneumatic tyre is
A. The radius of unloaded fully inflated tyre
B. The height of centre of tyre from the ground when it is loaded
C. Imaginary radius found by measuring the distance per revolution of the loaded tyre
D. It is fixed radius, based on the dimensions of the tyre Answer: A
265. For a through inspection a tyre should be
A. On the car
B. On the wheel
C. Off the wheel
D. Inflated Answer: D
266. If a tube of large size than required is installed in a tyre then
A. The tyre will over expand
B. The tyre and tube will not fit the rim
C. The tube will overlap and wear Answer: C
267. Of the four tyres on a car, the one that wears most is the
A. Right front tyre
B. Right rear tyre
C. Left front tyre
D. Left rear tyre Answer: B
268. To equalize tyre wear, it is suggested that tyres be rotated from one wheel to another every
A. 80 kms
B. 8000 kms
C. 800 kms Answer: B
269. The distance between dual tyres of vehicles is to be correctly spaced to
A. Ensure proper distribution of load between dual wheels
B. Reduce over-steering effect
C. Reduce the slippage between tyre and road while taking a turn
D. Ensure effective braking Answer: C
270. When an automobile takes a tum to avoid the skidding and over turning
A. Each wheel will roll independently
B. Front two wheels will have a common centre during a turning
C. All the 4 wheels will roll on arcs having a common centre Answer: B
271. Wheels must be balanced
A. On the car only
B. Either on or off the car
C. Off the car only Answer: C
272. Weight can be attached to wheel rim to correct
A. Wheel alignment
B. Wheel run out
C. Wheel balance Answer: C
273. Toe out on turns
A. Is adjusted by shims
B. Is adjusted by changing the effective length of the tie rods
C. Cannot be adjusted Answer: C
274. Caster is defined as the inclination of
A. Front wheel to the vertical
B. The king pin axis in the fore and aft plane
C. The king pin axis in the transverse vertical plane
D. The axis of stub axle to the horizontal Answer: B
275. The Ackermann steering layout
A. Makes for safer driving
B. Enables the driver to feel ahead position
C. Gives minimum tyre wear
D. Reduces load on the kingpins and stub axle Answer: A
1. In commercial vehicle layouts engine is located forward, rear or under floor mainly to
a. Better utilization of space
b. Increase fuel economy
c. Better weight distribution
d. Reduce the weight of chassis Answer: c
2. The type of air cycle used in diesel engine is called
a. Otto cycle
b. Carnot cycle
c. Diesel cycle
d. Rankine cycle Answer: c
3. During suction stroke the pressure inside the cylinder is
a. Equal to atmospheric pressure
b. Above atmospheric pressure
c. Above or below atmospheric pressure
d. Below atmospheric pressure Answer: d
4. During compression stroke the air is compressed according to
a. Isothermal process
b. Hyperbolic process
c. Adiabatic process
d. Constant pressure process Answer: c
5. The heat is added in the cycle at
a. Constant pressure
b. Constant volume
c. Approximately constant pressure and constant volume Answer: c
6. The fuel injected when pressure in the cylinder reaches the point ……….. on the curve
a. 1
b. 2
c. 3
d. 4 Answer: c
7. The crankcase scavenging the the crankcase or underside of the piston acts as
a. An air compressor
b. A blower
c. A ventilator
d. A breather Answer: a
8. The two-stroke engine has valve ports in the
a. Pistons
b. Cylinder walls
c. Piston rings Answer: b
9. The temperature of the piston will be more at
a. The piston walls
b. The crown of the piston
c. The skirt of the piston
d. The piston pin Answer: b
10. Connecting rods are generally of the following from
a. Forged round section steel
b. Cast steel triangular section
c. Forged square section steel
d. Forged I section steel Answer: d
11. For petrol engines the nominal compression ratio will vary between
a. 1 to 2:1
b. 18 to 21:1
c. 1 to 5:1
d. 7.5 to 8.5:1 Answer: d
12. For diesel engines the nominal compression ratio is from
a. 17 to 21:1
b. 7.5 to 8.5:1
c. 30 to 40:1
d. 1 to 5:1 Answer: a
13. One of the major causes of FHP in an engine is
a. High speed
b. High volumetric efficiency
c. Piston-ring friction Answer: c
14. Engine torque is highest at
a. Low speed
b. Intermediate speed
c. High speed Answer: b
15. The maximum pressure of air fuel mixture at the end of compression in petrol engines varies from
a. 10-30 Kg/cm2 b. 30-100 Kg/cm2
c. 6-10 Kg/cm2
d. 100-1000 Kg/cm2 Answer: a
16. When we lift a 10 kg weight, 3 metre we would be doing
a. 300 m kg of work
b. 3 m kg of work
c. 30 m kg of work Answer: c
17. The characteristic of an object which makes it resist any tendency to change its direction of motion is called
a. Inertia
b. Power
c. Internal energy Answer: a
18. The maximum pressure of air at the end of compression in diesel engines is about
a. 10 Kg/cm2
b. 100 Kg/cm2
c. 300 Kg/cm2
d. 30 Kg/cm2 Answer: d
19. As the number of cylinders in multi cylinder engines increases the power to weight ratio ………
a. Remains the same
b. Increases
c. Becomes zero
d. Decreases Answer: b
20. The type of friction generally present in an automotive engine is
a. Viscous friction
b. Greasy friction
c. Dry friction Answer: a
21. The fit of the piston to the cylinder is measured at the
a. Piston skirt
b. Piston head
c. Point of minimum diameter Answer: b
22. Vibration damper ……….
a. controls the torsional vibrations
b. drives the pulley
c. dampens the engine speed
d. reduces the speed of the flywheel Answer: a
23. In a six cylinder engine there is balance of
a. Primary forces only
b. Secondary forces only
c. Both primary and secondary forces Answer: c
24. If the connecting rod longer, the side thrust of the piston is
a. Increased
b. Constant
c. Decreased Answer: c
25. In general the design of the current regulator is such that its main actuating winding carries full
a. Generator voltage
b. Generator output
c. Field current
d. Battery voltage Answer: b
26. Immediately after ignition, combustion chamber temperatures may reach a value of
a. 15000C
b. 55000C
c. 25000C
d. 75000C Answer: a
27. The compression ratio in a diesel engine is as high as
a. 25:1
b. 20:1
c. 10:1
d. 5:1 Answer: b
28. The temperature of the compressed air should be ………….. of the fuel
a. Below the flash point
b. Above the flash point
c. Above the fire point
d. Between the fire and flash point Answer: c
29. The compression pressure in diesel engine is around
a. 30 Kg/cm2
b. 10 Kg/cm2
c. 20 Kg/cm2
d. 40 Kg/cm2 Answer: a
30. The combustion process in a diesel engine is
a. Constant pressure process
b. Isothermal process
c. Constant volume process
d. Adiabatic process Answer: a
31. Which type of valve arrangements require the use of rocket arms?
a. H – head
b. T – head
c. I – head
d. L – head Answer: c
32. The conventional mechanical type fuel pump develops …………. pressure
a. 0.15 Kg/cm2
b. 1.0 Kg/cm2
c. 0.5 Kg/cm2
d. 0.3 Kg/cm2 Answer: b
33. As compression ratio in an engine goes up, the octane requirements of the fuel
a. Goes down
b. Goes up
c. Stay about the same Answer: b
34. The metering rod is designed to vary the size of which jets
a. High speed jets
b. Accelerating jets
c. Float level jets
d. Idle jets Answer: a
35. The turbulence in diesel engines ensures to
a. Increase the volumetric efficiency
b. Increase the compression ratio
c. Bring the fuel quickly in contact with the air
d. Increase the specific fuel consumption Answer: c
36. If compression ratio is increased
a. Thermal efficiency will be increased
b. Volumetric efficiency will be increased
c. Air standard efficiency will be decreased
d. Air standard efficiency will be increased Answer: d
37. In ‘V’ type engines the included angle between two banks of cylinders is
a. 450
b. 600
c. 1300
d. 900 Answer: d
38. The duration of the fuel injection at full load in a diesel engine running at 1800 rpm when it has 200 of crank travel is
a. 1/600 sec
b. 1/640 sec
c. 1/540 sec
d. 1/530 sec Answer: c
39. Comparing a Four wheel drive with Two wheel drive system either at front or rear and assuming an equal division of weight between the two axes
a. From the point of view of traction front wheel drive is better than rear wheel drive
b. Front wheel and rear wheel drive are equal
c. Four wheel drive can always give more traction than either rear or front wheel drive
d. Four wheel drive can utilize all the weight of the vehicle only at a particular road friction Answer: c
40. The range of gear ratios in a vehicle depends on
a. The ratio of engine h.p to laden weight of vehicle
b. Max. engine torque / wt. of vehicle
c. Only on the laden weight of vehicle
d. The power to weight ratio of engine Answer: b
41. Most of the mopeds in India have capacity of
a. 10 cc
b. 250 cc
c. 50 cc
d. 175 cc
e. 150 cc Answer: c
42. Which motor cycle has maximum power rating
a. Rajdoot
b. Jawa
c. Yamaha
d. Bullet Answer: c
43. During a collision the front parts of an automobile are subjected to a deceleration of about ……… at about 50 mphr
a. 100g
b. 1000g
c. 1g
d. 10g Answer: c
44. Piston displacement is calculated from the
a. Cylinder diameter and length
b. Piston length and diameter
c. Bore and stroke Answer: c
45. The power used in overcoming friction in the engine is called
a. FHP
b. BHP
c. IHP Answer: a
46. During combustion the pressure in the cylinder may increase to as much as
a. 50 Kg/cm2
b. 400 Kg/cm2
c. 10 Kg/cm2 Answer: a
47. The size of intake valve is
a. Smaller than that of the exhaust valve
b. Equal to that of the exhaust valve
c. Larger than that of the exhaust valve
d. Not depending upon the size of exhaust valve Answer: c
48. A negative loop in the P.V diagram of an I.C engine is due to
a. Pre ignition in the engine
b. Suction of air for engine
c. Pre opening of the exhaust valve
d. High pressure in the cylinder Answer: b
49. Two stoke engine is preferred for small vehicles because
a. Fuel consumption is low
b. Shock and vibrations are less
c. Its size is small
d. It is easy to control Answer: c
50. Knowing the speed at which an engine is running and the torque it is developing, we can calculate
a. FHP
b. IHP
c. BHP Answer: a
1. The radiator tubes are manufactured by using
a. Cast iron tubes
b. Aluminum tubes
c. Brass tubes
d .Steel tubes Answer: c
2. If we know the engine speed, bore, stroke, number of cylinders and m.e.p in the cylinders, we can calculate
a. FHP
b. IHP
c. BHP Answer: b
3. Knowing the IHP and FHP of an engine, we can calculate
a. Compression ratio
b. rpm
c. SAF
d. BHP Answer: d
4. Which one of the following is not a trade name of tractor in India
a. Kirloskar
b. Escort
c. Standard
d. HMT Answer: c
5. The ratio between the power output of an engine and the energy in the fuel burned to produce that power is called
a. Volumetric efficiency
b. Thermal efficiency
c. Mechanical efficiency Answer: b
6. The air volume in the cylinder with the piston at B.D.C divided by the clearance volume is called
a. Compression ratio
b. Piston displacement
c. Cylinder ratio Answer: a
7. The power used in overcoming friction in the engine is called
a. BHP
b. IHP
c. FHP Answer: c
8. The average pressure during the power stroke minus the average pressure during the intake, compression and exhaust strokes is called
a. IHP
b. Compression ratio
c. BHP
d. m.e.p Answer: d
9. IHP minus FHP equals
a. BHP
b. SAF HP
c. m.e.p Answer: a
10. Engine torque is highest at
a. High speed
b. Low speed
c. Intermediate speed Answer: c
11. BHP divided by IHP is
a. Thermal efficiency
b. Mechanical efficiency
c. Volumetric efficiency Answer: b
12. The percentage of the energy in the petrol burnt in the engine which is actually utilized in propelling the car is as little as
a. 25%
b. 60%
b. 35%
d. 15% Answer: a
13. In the diesel engine, the compression ratio is as high as
a. 10:1
b. 15:1
c. 5:1 Answer: b
14. The device for smoothing out the power impulses from the engine is called the
a. Flywheel
b. Camshaft
c. Crankshaft
d. Clutch Answer: a
15. The amount of air fuel mixture taken in by the engine on the suction stroke is a measure of the engine’s
a. Compression ratio
b. Volumetric efficiency
c. Clearance volume Answer: b
16. The size of an engine cylinder is referred to in terms of its
a. Diameter and bore
b. Bore and length
c. Bore and stroke Answer: c
17. In an operating engine, the hottest part of the piston is the
a. Head
b. Ring grooves
c. Skirt
d. Pin bosses Answer: a
18. In normal operation the part of the exhaust valve that gets the hottest is
a. Face
b. Middle of Stem
c. Centre of head
d. Edge of margin Answer: c
19. The power developed inside the engine cylinder is called
a. IHP
b. FHP
c. BHP Answer: a
20. The ratio of the cylinder volume at BDC and the clearance volume is called
a. Clearance ratio
b. Volumetric ratio
c. Compression ratio Answer: c
21. As a rule when comparing the front and rear wheel cylinder pistons, it will be found that the pistons in the front wheel cylinders are
a. The same size
b. Larger in diameter
c. Smaller in diameter Answer: b
22. Twisting and untwisting of the crankshaft is called
a. Torsional vibration
b. Power impulsion
c. Torsional balance Answer: a
23. The rotating effect of the connecting rod on the connecting rod bearing produces
a. Pressure load
b. Inertia load
c. Centrifugal load Answer: c
24. Important bearing characteristics include
a. Embeddability, compression and fatigue
b. Exbeddability, conformability and fatigue resistance Answer: b
25. In the engine there must be relative motion between the piston and the connecting rod
a. Atmospheric pressure, inertia and torsional vibration
b. Centrifugal force, inertia and combustion pressure
c. Inertia, engine speed and centrifugal force Answer: b
26. Two of the three connecting rod bearing loads that increase as engine speeds increase are
a. Centrifugal and inertia loads
b. Torsional and pressure loads
c. Pressure and inertia loads
d. Pressure and centrifugal loads Answer: a
27. When different forces act at angles on connecting rod bearing, the combining of these forces produces a
a. Remaining force
b. Canceling force
c. Resultant force Answer: c
28. The active material in a charged negative plate is
a. Lead sulphate
b. Lead peroxide
c. Lead metal
d. Lead per chloride Answer: c
29. The tree general types of friction bearings are
a. Journal, ball and roller
b. Journal, guide and thrust
c. Journal, shaft and thrust Answer: b
30. Petrol and Gasoline is called a hydrocarbon because it consists essentially of
a. Carbon and Hydrogen
b. Oxygen and Hydrogen
c. Carbon and Oxygen Answer: a
31. Almost all bearing used in automotive engines are
a. Guide bearings
b. Friction bearings
c. Antifriction bearings Answer: b
32. The brake shoes are curved to conform to the inner diameter of the
a. Tyre
b. Wheel
c. Pedal
d. Brake drum Answer: d
33. It is cheaper if we use gaskets of
a. Rubber asbestos type
b. Copper asbestos type
c. Steel asbestos type Answer: a
34. With an increase in temperature the resistance of carbon is
a. Unchanged
b. Decreased
c. Increased Answer: c
35. When petrol burns completely, two of the compounds that are formed are
a. Carbon dioxide and water
b. Water and oxygen
c. Hydrocarbon and oxygen Answer: a
36. Due to heat of combustion, with increase in temperature the molecules
a. Move slower
b. Vaporize
c. Move faster Answer: c
37. When air is heated, it
a. Contracts and becomes heavier
b. Expands and becomes heavier
c. Expands and becomes lighter Answer: c
38. Changing position of an object against an opposing force is called
a. Power
b. Torque
c. Energy
d. Work Answer: d
39. A liquid that boils at a relatively high temperature is said to have
a. A low viscosity
b. A high viscosity
c. A high volatility
d. A low volatility Answer: d
40. The ease with which a liquid changes to a vapour is called its
a. Vapourability
b. Boiling point
c. Viscosity
d. Volatility Answer: d
41. The pump part that rotates and causes water circulation between the radiator and engine is called
a. Impeller
b. Fan
c. Bypass Answer: a
42. The bearing having the least friction is the
a. Sleeve bearing
b. Antifriction bearing
c. Friction bearing Answer: b
43. Conform ability of an engine bearing is
a. Ability of a bearing to withstand the wear and tear
b. Resistivity to corrosion
c. Ability of the bearing to adjust itself to variations in shaft alignment and journal shape
d. Ability of a bearing to permit foreign particles to embed in it Answer: c
44. The most commonly used material for tyre tubes is
a. Butyl
b. Natural rubber
c. Butane Answer: a
45. When the plates of battery cell are made larger in size, we get increased …………
a. Current
b. Voltage
c. Cell resistance Answer: a
46. When preparing electrolyte, it is important to remember that
a. Acid and water should be poured together
b. Water should be poured into acid
c. Acid should be poured into water Answer: c
47. Aluminium alloy pistons are preferred because
a. They are good absorbers of shock
b. They are having less weight
c. They have good water resistance
d. They are very strong in tension Answer: b
48. The material used for the piston of modern passenger cars are
a. Brass pistons
b. Cast iron pistons
c. Aluminiun alloy pistons
d. Steel pistons Answer: c
49. Piston compression rings are manufactured by
a. Aluminium
b. Cast iron
c. Steel
d. Bronze Answer: b
50. Gudgeon pins or piston pins are made by
a. Piston material itself
b. Cork
c. Cast iron
d. Hardened and ground steel Answer: d
1. The brake pipe in hydraulic brakes is made up of
a. PVC
b. Steel
c. Rubber
d. Copper Answer: b
2. The ease with which a liquid vapourizes is called its
a. Volatility
b. Octane rating
c. Vapourability Answer: a
3. As the battery is discharged, the active materials in both negative and positive plates are changed to
a. Spongy lead
b. Sulphuric acid
c. Lead oxide
d. Lead sulphate Answer: d
4. The pipes used in diesel engines from pump to nozzle is made up of
a. PVC
b. Rubber
c. Steel
d. Copper Answer: c
5. Two types of antifreeze are
a. Iso octane and ethylene glycol
b. Alcohol base and ethylene glycol
c. Ethylene glycol and propylene glycol Answer: b
6. The substance added to the oil which helps to keep the engine clean is called
a. Grease
b. Thickening agent
c. Soap
d. Detergent Answer: d
7. One advantage of using an exhaust valve as insert is that the ring
a. Withstands high exhaust gas temperature better
b. Is more easily machined
c. Wears in more quickly Answer: a
8. The crankshafts are usually forged to get
a. Minimum friction effects
b. A good mechanical design
c. Good grain structure
d. Improved corrosion structure Answer: b
9. The number of parallel paths in a lap winding of the armature of a DC generator is equal to
a. Half the number of poles
b. Number of poles
c. Two Answer: b
10. The unsprung mass in a vehicle system is mainly composed of
a. The frame assembly
b. Gear box and propeller shaft
c. Axle and the parts attached to it
d. Engine and associated parts Answer: c
11. Parts of the shock absorber include
a. Valves
b. Coupler
c. Valve springs
d. Pistons Answer: a
12. The automobile chassis consists of the engine, frame, power train, wheels, steering and …………..
a. The doors
b. Luggage boot
c. Wind shield
d. Braking system Answer: d
13. The frame provides support for the engine body, power train members and …….
a. Wheels
b. Jack
c. Road Answer: a
14. The engine is usually supported by the frame
a. Four or five
b. One or two
c. Three or four
d. One or two Answer: c
15. The central part of the axle beam is offset downwards to
a. Give improved resistance to end thrusts during cornering
b. Give better bending strength
c. Give improved torsional strength during brake application
d. Clear the engine sump and lower vehicle centre of gravity Answer: d
16. X – member of a car frame ensures improved
a. Resistance to side force due to transverse wind load
b. Bending strength of side members
c. Resistance to vertical shock loads acting simultaneously on both front wheels
d. Resistance of weaving and torsional strength of front end of frame Answer: a
17. The purpose of the shock absorbers is to
a. Strengthen frame
b. Damp spring oscillations
c. Improve rigidity of spring mountings Answer: b
18. The rear end suspension arrangement in which rear end torque is absorbed by the spring is called the
a. Torque tube drive
b. Hooks drive
c. Differential drive
d. Hotchkiss drive Answer: d
19. On rebound, in the direct acting shock absorber, fluid flows out of the upper part of the cylinder and also ………..
a. Out of the dust shield
b. Out of the reservoir
c. Into the reservoir
d. Into the dust shield Answer: b
20. The weight or pressure required to deflect a spring in mm is called the spring
a. Weight
b. Deflection
c. Rate
d. Rebound Answer: c
21. Leaf spring for vehicles are nipped to
a. To vary the effective length of the spring
b. To increase the interleaf friction
c. Improve the load carrying capacity of spring
d. Ensure that all leaves are uniformly stressed during loading Answer: d
22. The device that permits variation in the distance between the spring eyes of a leaf spring as the spring
flexes is called
a. Spring shackle
b. Spring U – bolt
c. Spring hanger
d. Spring leaf Answer: a
23. When the direct acting shock absorber is compressed or telescoped fluid passes through the piston orifices into the upper part of the cylinder and also
a. Into the dust shield
b. Out of the dust shield
c. Into the reservoir
d. Out of the reservoir Answer: c
24. The clips placed at intervals along some leaf spring to prevent spring leaf separation on rebound, are
called
a. Rebound clips
b. Separation clips
c. Interval clips
d. Relief clips Answer: a
25. In a vehicle with torque tube drive, the rear suspension spring
a. Takes up driving thrust and torque reaction
b. Supports load and takes up end thrust
c. Takes up braking thrust and torque reaction
d. Takes up end thrust and torque reaction Answer: b
Automobile Engineering Interview Questions and Answers for Competitive Exams
26. With a leaf spring type of suspension, interference between steering and suspension system can be
reduced to minimum when
a. Front end of the spring is pin joined and the rear end is shackled
b. Front end of the spring is shackled and rear end is pin jointed
c. Both end of the spring are shackled
d. Both ends of the springs are pin jointed Answer: b
27. The laminated spring, which is in common use, is of the type
a. Full elliptic
b. Semi elliptic
c. One quarter elliptic
d. Three quarter elliptic Answer: b
28. A double acting shock absorber usually has
a. Unequal pressure acting on either sides
b. Equal pressure on either side
c. Pressure acting only on one side Answer: a
29. Hotchkiss drive is the name associated with
a. A type of automatic transmission
b. The kind of drive for independent suspension axles
c. A means of taking up torque and thrust by leaf springs
d. A type of gear box Answer: b
30. The part of the vehicle holds the passengers and the cargo to be transported is known as
a. Hull
b. Chassis
c. Cabin
d. Sedan Answer: a
31. The power train includes the clutch, propeller shaft, differential and …………….
a. Steering gear
b. Front axles
c. Chassis
d. Transmission Answer: d
32. In gear systems, speed reduction means torque
a. Stabilization
b. Increase
c. Reduction Answer: b
33. Clutch slippage while clutch is engaged is particularly noticeable
a. When starting the engine
b. During acceleration
c. During idle
d. At low speed Answer: b
34. Clutch chattering or grabbing is noticeable
a. At low speed
b. When engaging the clutch
c. When accelerating
d. During idle Answer: d
35. Clutch noises are usually most noticeable when the engine is
a. Being started
b. Decelerating
c. Idling
d. Accelerating Answer: c
36. Synchronizing devices are designed to prevent gear clash when shifting into
a. First and second
b. Second and high
c. First and reverse Answer: b
37. The overdrive is located between the
a. Transmission and the propeller shaft
b. Planetary gears and clutch
c. Transmission and clutch Answer: b
38. The sun gear in the planetary gear system meshes with the
a. Pinion cage
b. Ring gear
c. Clutch gear
d. Planet pinions Answer: d
39. Pressing down on clutch pedal causes the release levers to move the pressure plate away from
a. Friction disc
b. Clutch cover
c. Pressure plate baffle
d. Throw out bearing Answer: a
40. In coil spring type of clutch the cover is separated by
a. Removing three screws or nuts
b. Unhooking three retainer springs
c. Removing wire coil springs
d. Detaching three lever springs Answer: a
41. In the high gear in the transmission, main shaft turns at the same speed as the
a. Idler shaft
b. Counter shaft
c. Clutch shaft Answer: c
42. The purpose of the fluid coupling is to act as a
a. Automatic gear changer
b. Flexible power transmitting coupling
c. Synchronizing device Answer: b
43. In the fluid coupling oil passes from the driving to the
a. Gear
b. Coupling
c. Vanes
d. Driven member Answer: d
44. Braking is produced by the frictional effect between the brake drum and the
a. Wheel studs
b. Wheel rim
c. Brake shoes
d. Wheel cylinder pistons Answer: c
45. The drive pinion in the over running clutch is moved into mesh for cranking action by
a. A shaft lever
b. Sleeve turning in pinion
c. Pinion inertia Answer: c
46. The function of a torque converter or fluid converter is similar to that of a
a. Gear box
b. Clutch
c. Shock absorber
d. Torsion box Answer: a
47. In the transmission system, the provision of slip joints allows a change in the
a. Angle of drive
b. Length of shaft
c. Speed of rotation Answer: b
48. In the torque converter, oil leaving the turbine is changed into a helping direction by curved
a. Pump vanes
b. Stator vanes
c. Turbine vanes Answer: b
49. In a fluid coupling the greater the difference between the speeds of the driving and the driven member
a. Higher the coupling efficiency
b. The lower the turbulence
c. The lower the coupling efficiency Answer: c
50. The ratio between the speed of the camshaft and the speed of the crankshaft is
a. 1:1
b. 1:4
c. 1:2
d. 1:1/4 Answer: b
1. The free wheeling mechanism contains
a. A planetary gear
b. A transmission
c. An over running clutch
d. A propeller shaft Answer: c
2. For each crankshaft revolution, the cam shaft revolves
a. one half-turn
b. one turn
c. two turns
d. four turns Answer: a
3. The overdrive is located between
a. Gear box and clutch
b. Gear box and propeller shaft
c. Planetary gears and clutch Answer: b
4. The synchronizing device used in the transmission uses
a. Cone braking surfaces
b. Flat braking surfaces
c. Synchronizing pins Answer: a
5. The second movement of the gear shift lever produces
a. The correct gears to mesh
b. The movement of the drive gear
c. Release of clutch Answer: a
6. There are two separate movements of the gear shift lever for changing the gears.
The first movement selects
a. The shaft to be moved
b. The shaft pedal to be moved
c. Shifter fork which operates gear assembly to be moved Answer: c
7. The standard transmission has
a. One shifter fork
b. Two shifter forks
c. Three shifter forks
d. Four shifter forks Answer: c
8. The conventional motor car has
a. Two forward speeds
b. Three forward speeds
c. Four forward speeds Answer: c
9. In the transmission, the reverse idler gear always mesh with
a. Counter shaft drive gear
b. Counter shaft low gear
c. Main shaft reverse gear
d. Counter shaft reverse gear Answer: d
10. In transmission reduction of speed is always used to obtain
a. Reduction of torque
b. Constant torque to drive the wheels
c. Increase of torque Answer: c
11. The device that produces different gear ratios in the power train is called
a. Differential
b. Transmission
c. Speed Changer Answer: b
12. In the automobile, the power train carries the engine power from the engine to the rear wheels. The power
train includes the clutch propeller shaft, differential and
a. Front axis
b. Steering gear
c. Gear box
d. Chassis Answer: c
13. In the coil spring type of clutch when the pressure plate and cover are separated, the spring pressure must
be held by
a. Hand
b. An arbor press
c. A lever
d. A heavy weight Answer: b
14. Parts of the clutch that should not be cleaned in solvent include the
a. Friction disc and throw out bearing
b. Friction disc cover
c. Throw out bearing and springs
d. Release levers and springs Answer: a
15. On diaphragm spring clutch, pressing down on the clutch pedal moves throw out bearing in against the
a. Release levers
b. Diaphragm
c. Pressure plate
d. Friction disc Answer: a
16. As a general rule in facings on the friction disc are worn down to the rivet heads
a. Rivets should be
replaced
b. The friction disc should be replaced
c. The clutch should be replaced
d. The linkage should be adjusted Answer: b
17. The front end of the clutch shaft is supported in a pilot bearing in the
a. Throw out bearing
b. Friction disc
c. Crankshaft
d. Transmission Answer: c
18. The three forward speed and the reverse transmission consists of three shafts and
a. Three gears
b. Five gears
c. Eight gears
d. Ten gears Answer: c
19. Synchromesh devices in the transmission synchronize the gears about to be
a. Meshed
b. De-meshed
c. Stopped Answer: a
20. In the transmission the counter shaft drive gear is meshed with a gear on the
a. Output shaft
b. Main shaft
c. Clutch shaft Answer: b
21. The fluid coupling is most efficient as drive ratio approaching to
a. 1:1
b. 2:1
c. 1:5:1
d. 1:3 Answer: a
22. In the fluid coupling speed reduction means
a. torque reduction
b. torque increase
c. power increase Answer: a
23. When the clutch is engaged, spring pressure clamps the friction disc between the pressure plate and the
a. Flywheel
b. Differential
c. Reaction plate
d. Clutch pedal Answer: a
24. The free travel of the medal, or pedal lash is the amount of travel the pedal has before the throw out
bearing comes up against the
a. Release levers
b. Flywheel
c. Floor board
d. Stop Answer: a
25. The automobile transmission is removed from the car by taking it out
a. From under car
b. Through driving compartment
c. Through engine compartment Answer: a
Automobile Engineering Objective Type Interview Questions Pdf | Preparation for GATE Exams
26. Overdrive is provided in the transmission of a vehicle to
a. Reach higher road speeds
b. improved fuel consumption
c. achieve better acceleration
d. carry more load Answer: b
27. The number of gear ratios in a vehicle
a. Is more with high powered vehicle
b. Is less with high powered cars
c. Is more with diesel engine heavy vehicles
d. is more with petrol engine typical American Car Answer: a
28. In the process of gear shifting in a layshaft type of gearbox
a. An upchange say third to Top Gear requires speeding up of lay shaft
b. An up change requires slowing down the layshaft
c. An upchange or down change is not accompanied by changes in layshaft speed
d. Gear shifting involves change of speed only in down shifts Answer: b
29. A fluid coupling
a. Acts like flywheel and replaces it since as it is known also by the name fluid wheel
b. It takes the place of friction clutch and replaces it completely in synchromesh transmission systems
c. It replaces the friction clutch and the Gearbox also
d. Does the function of a clutch automatically, but cannot be used for shifting transmission to effect Gear changes Answer: d
30. The main advantage of a fluid coupling is
a. In its low torque capacity at low speeds
b. Steady state torque characteristic
c. Due to its ability to slip
d. Due to its ability to function fluid medium Answer: c
31. The hydrodynamic torque converter
a. Gives a continuous variation of torque with increase of output speed
b. Enables to get the max. h.p continuously
c. Gives a speed variation without torque variation
d. Maintains a high efficiency throughout the operating speed range Answer: a
32. An automatic transmission works on the principle of
a. Centrifugal device making up changes proportional to road speed
b. Centrifugal device connected to crankshaft making up changes prop. to engine speed
c. Makes changes depending on throttle position in conjunction with road speed governor
d. Makes gear changes at equal intervals or set road speeds Answer: c
33. The coil springs are located in between the pressure plate and the
a. Clutch cover
b. Disc assembly
c. Pressure plate baffle
d. Flywheel Answer: a
34. The clutch cover is bolted to the
a. Friction disc
b. Flywheel
c. Car frame
d. Engine block Answer: b
35. The friction disc is positioned between the flywheel and the
a. Engine
b. Crankshaft
c. Pressure plate Answer: c
36. There is a double faced friction disc splined to a shaft in the
a. Transmission
b. Differential
c. Engine
d. Clutch Answer: d
37. To prevent distortion on re-installation on the clutch cover attaching bolts should be tightened
a. One at a time
b. Evenly
c. Until springs begin to compress
d. Until springs are expanded Answer: b
38. The power train transmits power from the engine to the
a. Crank shaft
b. Rear wheels
c. Front wheels
d. Steering gear Answer: b
39. The clutch pressure plate is mounted on the
a. Flywheel
b. Clutch cover
c. Friction disc
d. Crankshaft Answer: b
40. The release levers in a typical clutch pivot on
a. Springs
b. Levers
c. Threaded levers
d. Pins Answer: d
41. If two meshing gears have 4:1 gear ratio and the smaller gear has 12 teeth, the large gear will have
a. 12 teeth
b. 24 teeth
c. 36 teeth
d. 48 teeth Answer: d
42. The two meshed gears have a gear ratio of 3:1. Every time the larger gear turns once the small gear will
be to turn
a. 1/3 time
b. one
c. three times Answer: c
43. In the diaphragm clutch inward movement of the throw out bearing causes the diaphragm spring to
a. Dish inward
b. Expand
c. Contract Answer: a
44. The fluid coupling has maximum efficiency when driving and driven members are turning at
a. High speed
b. Low speed
c. Different speed
d. About the same speed Answer: a
45. The purpose of the guide ring in the fluid coupling is to reduce oil
a. Movement between the members
b. Turbulence
c. Level in coupling Answer: b
46. Synchronizing is designed to prevent gear clash when shifting into
a. First and reverse
b. First and second
c. Second and high Answer: c
47. When shifting into low, a gear on the transmission main shaft is moved in to mesh with the
a. Counter shaft low gear
b. Counter shaft idler
c. Clutch gear
d. Output gear Answer: a
48. Clutch noises are usually most noticeable when the engine is
a. Accelerating
b. Decelerating
c. Idling
d. Being started Answer: c
49. Clashing of gears when shifting into high could result from
a. Engine misalignment
b. Drive key sheared
c. A defective Synchronizer Answer: c
50. Transmission noise in neutral could result from
a. Worn gears
b. Loose propeller shaft
c. Misadjusted gear linkage Answer: a
1. The purpose of the fluid coupling is to act as a
a. Synchronizing device
b. Automatic gear changer
c. Flexible power-transmitting coupling Answer: c
2. The distance between adjacent meshing teeth of mating gears is called
a. Clearance
b. Back lash
c. Flank Answer: b
3. In the fluid coupling, speed reduction means torque reduction. But in the torque converter, speed reduction means
a. Torque increase
b. Torque loss
c. Power increase Answer: a
4. The fluid coupling consists essentially of two
a. Doughnuts
b. Vane members
c. Guide rings
d. Driving shafts Answer: b
5. The number of planetary gear sets in a hydromatic transmission system is
a. Two
b. Three
c. Four
d. Five Answer: c
6. When coming out of overdrive, the overdrive electric control momentarily
a. De clutches the engine
b. Interrupts the ignition system action
c. De meshes the sun gear Answer: b
7. In order for power to flow through the fluid coupling from the engine to car wheels, the driving member
must be turning
a. Slower than driven member
b. At same speed as driven member
c. Faster than driven member Answer: c
8. In the overdrive, there is an arrangement whereby it is possible to lock stationary the
a. Ring gear
b. Sun gear
c. Planet pinion cage Answer: b
9. The coil spring clutch may use from
a. Two to six springs
b. Three to nine springs
c. Four to eight springs
d. Ten to twelve springs Answer: b
10. If the differential noise is present only when the car is rounding a curve the trouble would be due to
a. Heavy heel contact on gear teeth
b. Heavy toe contact on gear teeth
c. Binding in differential case Answer: c
11. To correct heavy flank contact on the ring gear teeth
a. Move the drive pinion in
b. Move the drive pinion out
c. Move the ring gear out
d. Adjust back lash as necessary Answer: c
12. The ring gear is adjusted in the differential by use of
a. Selective washers of proper thickness
b. Bearing adjuster
c. Adjusting screws Answer: a
13. The axle bevel gears in the differential mesh with the
a. Differential pinion gears
b. Ring gear
c. Drive pinion
d. Main gear Answer: a
14. The ring gear is mounted on the
a. Differential housing
b. Differential carrier
c. Differential case
d. Axle housing Answer: d
15. The outer end of the axle is supported by a
a. Spring seat
b. Sleeve bearing
c. Housing bracket
d. Ball or roller bearing Answer: d
16. When the axle is pulled the bearing
a. Stays in the housing
b. Stays in the differential
c. Comes out with it Answer: a
17. In the differential the ring gear is bolted to the
a. Differential housing
b. Differential case
c. Axle housing
d. Drive pinion Answer: b
18. The slip joint permits a change in the
a. Length of shaft
b. Speed of rotation
c. Angle of drive Answer: a
19. The centre part of a typical universal joint is called the
a. Trunnion
b. Joint
c. Bearing
d. Spider Answer: d
20. To take care of the difference in the driving angle as rear axle moves up and down, the propeller shaft has
one or more
a. Slip joint
b. Elbow joint
c. Release joint
d. Universal joints Answer: d
21. In the modern differential, the type of gearing used for the drive pinion and ring gear is
a. Spur
b. Spiral bevel
c. Hypoid Answer: c
22. The propeller shaft has one or more
a. Spur gears
b. Elbow joints
c. Universal joints
d. Fluid couplings Answer: c
23. There is a tendency for the rear axle housing to rotate in a direction opposite to the direction of the rear
wheels and this effect is due to
a. The torque tube
b. Acceleration
c. Rear end torque Answer: c
24. In the slip joint, slippage occurs between internally and externally mated
a. Couplings
b. joints
c. Splines Answer: c
25. If a noise is present in a differential only when the car moves past a curve, the chances are that the trouble
is due to some fault in
a. Drive pinion assembly
b. Differential case assembly
c. Wheel bearing Answer: b
26. In the differential to correct for heavy face contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive pinion out
c. Drive gear out and then adjust backlash Answer: a
27. In the differential, to correct for heavy flank contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive pinion out
c. Drive gear out and then adjust back lash Answer: c
28. In the differential, to correct for heavy heel contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive gear towards pinion
c. Drive gear away from pinion and adjust back lash Answer: a
29. In the differential, to correct for heavy toe contact on the drive gear teeth, it is necessary to move the
a. Drive gear towards pinion
b. Drive pinion gear away from pinion
c. Drive pinion out and adjust back lash Answer: c
30. The drive gear in the differential is adjusted by use of
a. Selective washers of proper thickness
b. Adjustment nuts
c. Adjustment screws Answer: a
31. The type of rear axle in which the wheel end is supported by bearings inside the axle housing is
a. Semi floating axle
b. Three-quarter floating axle
c. Full-floating axle Answer: a
32. The two basic types of axle are
a. Dead and floating
b. Dead and live
c. Floating and semi floating Answer: b
33. In the differential, the ring gear is bolted to the
a. Differential housing
b. Differential case
c. Drive pinion
d. Axle shaft Answer: b
34. In the Hotchkiss drive, the rear end torque is absorbed by the
a. Torque tube
b. Rear springs
c. Radius rods Answer: b
35. The universal joint permits a change in the
a. Length of the shaft
b. Speed of rotation
c. Angle of drive Answer: c
36. To correct heavy heel contact on the ring gear teeth, move the
a. Drive pinion in
b. Ring gear towards pinion
c. Ring gear away from pinion and adjust backlash Answer: a
37. Propeller shaft includes
a. Universal joint
b. Knee joint
c. Slip joint Answer: a
38. A humming noise in the differential is often caused by improper tooth contact between the
a. Drive pinion & ring gear
b. Axle and side gear
c. Pinion and side gears Answer: a
39. Axle shaft of the three-quarter floating axle is subjected to
a. Bending stress only
b. Torsional stress only
c. Bending and torsional stress
d. Torsional stress and stress due to axial force during cornering Answer: b
40. Whirling of the propeller shafts is mainly due to
a. The transmission of torsional vibration of the crankshaft
b. The use of a sliding joint in the propeller shaft
c. The use of universal joints in the drive
d. Lack of balance and excessive length of propeller shaft Answer: d
41. In a vehicle with dual rear axle, the wheel base is measured from the
a. Axis of the front wheel to the nearest rear wheel axis
b. Axis of the front wheel to the farthest rear wheel axis
c. Rear of cab to farthest rear wheel axis
d. Axis of the front wheel to an axis midway between the axes of rear wheels Answer: c
42. The axle shaft of a semi floating rear axle is subjected to
a. Axial thrust only
b. Axial thrust and bending stress
c. Torsional stress only
d. Bending, torsional stresses and end thrust Answer: d
43. Differential mechanism at the axle is provided mainly to
a. Enable the vehicle go round corners
b. Equalize the division of torque between the two wheels c. To provide a reduction ratio
d. To turn the drive through a right angle Answer: a
44. De Dion axle is usually
a. Used at the front of heavy vehicles
b. A kind of axle in which the differential and final drive gears are supported in the frame
c. A two speed axle drive suited for heavy vehicles
d. The popular drive for 2 wheeler Answer: b
45. Spur gear type of differential is unsuitable for passenger car applications because
a. It results in a very costly rear axle assembly
b. The large transmission losses due to spur gears
c. Large dimension of final drive housing resulting in reduced ground clearance
d. Centre of gravity of the vehicle is raised Answer: d
46. Floating axles are classified on the basis of
a. The amount of torque transmitted
b. Depending upon their location whether at front or rear
c. Depending on the nature of forces like torsional vertical and lateral to which they are subjected
d. Purely on the basis of type and number of bearings used at the work Answer: c
47. Which of the following layouts is not used in motor vehicles?
a. Front engine front drive
b. Front engine rear drive
c. Rear engine front drive
d. Rear engine rear drive Answer: c
48. The most popular drive at the drive axle for the passenger car is
a. Straight bevel gear
b. Spiral bevel gear
c. Worm gear drive
d. Hypoid drive Answer: d
49. The drive line consists of the propeller shaft with
a. Drive and universal joints
b. Universal joints and slip joints Answer: b
50. In the differential the ring gear is attached to the
a. Bevel gear
b. Drive gear
c. Differential case
d. Propeller shaft Answer: c
26. In trucks the system of wheel braking employed is
(a) Mechanical
(b) Hydraulic
(c) Pneumatic Answer: c
27. In jeeps we use
(a) Mechanical brakes
(b) Hydraulic brakes
(c) Air brakes Answer: b
28. In a vacuum type servo-assisted brake system, vacuum is available in …….. is made use of
(a) Exhaust manifold
(b) Combustion chamber
(c) Water jackets
(d) Inlet manifold Answer: d
29. The approximate ratio of effort applied : effort available from servo system is (a) 1:1
(b) 3:1
(c) 1:4
(d) 10:1 Answer: b
30. Due to continuous running on a hot day the temperature of the braking fluid will increase, hence some
braking torque is applied on brake shoes, to avoid this a small quantity of fluid will be allowed to escape
into the master cylinder through
(a) Intake port
(b) Exhaust port
(c) Secondary port Answer: c
31. As the load on the vehicle increase it demands
(a) Increased braking torque
(b) Decreased braking torque
(c) Same braking torque Answer: a
32. In the hydraulic brake system, the movement of a piston in the master cylinder produces hydraulic
pressure which causes movement of
(a) Brake shoe
(b) Brake pedal
(c) Brake cam Answer: a
33. In the case of brake linings saturants and bonding materials are used to
(a) Facilitate moulding and curing of brake linings
(b) To improve the heat dissipating capacity of linings
(c) To give a constant coefficient of friction up to 800 C
(d) To make the lining material impervious to moisture and oil and to ensure a steady coefficient of friction up to 3000 C Answer: a
34. Brake lining area required for shoe brakes for trucks is mainly based on
(a) Average truck speed
(b) Frequency of brake applications
(c) Gross vehicle weight
(d) Material used for brake drums Answer: c
35. The working fluid normally used in hydraulic brake systems is
(a) High speed diesel oil along with alcohol
(b) SAE 20 oil with anti-corrosion additives
(c) A mixture of vegetable oil and SAE 10 oil
(d) A solution of castor oil in alcohol along with neutralizer Answer: d
36. Movement of the brake pedal forces brake fluid from the master brake cylinder through brake lines and into the
(a) Brake shoes
(b) Wheel cylinders
(c) Brakes cables
(d) Pedal rod Answer: b
37. During braking the brake shoe is moved outward to press against the
(a) Wheel piston or cylinder
(b) Brake lining
(c) Brake drum or disc
(d) Wheel rim or axle Answer: c
38. In the hydraulic brake system, movement of a piston in the master cylinder produces hydraulic pressure which causes movement of the
(a) Wheel cylinder pistons
(b) Brake pedal
(c) Brake cam Answer: a
39. The radius of a pneumatic tyre is
(a) The radius of unloaded fully inflated tyre
(b) The height of centre of tyre from the ground when it is loaded
(c) Imaginary radius found by measuring the distance per revolution of the loaded tyre
(d) It is fixed radius, based on the dimensions of the tyre Answer: a
40. For a through inspection a tyre should be
(a) On the car
(b) On the wheel
(c) Off the wheel
(d) Inflated Answer: d
41. If a tube of large size than required is installed in a tyre then
(a) The tyre will over expand
(b) The tyre and tube will not fit the rim
(c) The tube will overlap and wear Answer: c
42. Of the four tyres on a car, the one that wears most is the
(a) Right front tyre
(b) Right rear tyre
(c) Left front tyre
(d) Left rear tyre Answer: b
43. To equalize tyre wear, it is suggested that tyres be rotated from one wheel to another every
(a) 80 kms
(b) 8000 kms
(c) 800 kms Answer: b
44. The distance between dual tyres of vehicles is to be correctly spaced to
(a) Ensure proper distribution of load between dual wheels
(b) Reduce over-steering effect
(c) Reduce the slippage between tyre and road while taking a turn
(d) Ensure effective braking Answer: c
45. When an automobile takes a tum to avoid the skidding and over turning
(a) Each wheel will roll independently
(b) Front two wheels will have a common centre during a turning
(c) All the 4 wheels will roll on arcs having a common centre Answer: b
46. Wheels must be balanced
(a) On the car only
(b) Either on or off the car
(c) Off the car only Answer: c
47. Weight can be attached to wheel rim to correct
(a) Wheel alignment
(b) Wheel run out
(c) Wheel balance Answer: c
48. Toe out on turns
(a) Is adjusted by shims
(b) Is adjusted by changing the effective length of the tie rods
(c) Cannot be adjusted Answer: c
49. Caster is defined as the inclination of
(a) Front wheel to the vertical
(b) The king pin axis in the fore and aft plane
(c) The king pin axis in the transverse vertical plane
(d) The axis of stub axle to the horizontal Answer: b
50. The Ackermann steering layout
(a) Makes for safer driving
(b) Enables the driver to feel ahead position
(c) Gives minimum tyre wear
(d) Reduces load on the kingpins and stub axle Answer: a
An important feature of the speculative demand curve is that if the current rate of interest falls to a very low level (say Oi*), the L2 curve becomes perfectly elastic. It means that at this extremely low rate of interest, people have no desire to lend money and will keep the whole money with them.
This is the minimum critical value of the current rate at which every one becomes a money holder because holding bonds means a net loss.
Liquidity trap represents a subjective minimum level of interest rate. Here virtually everyone is convinced that the market rate of interest is below the expected or normal rate of interest.
At such a low interest rate, bonds are considered so risky that the speculators are prepared to hold limitless amount of money.
The yield on the earning assets (bonds) is so low and the risk of holding earning assets is so high that the wealth holders are not ready to keep earning assets and decide to substitute money for earning assets.
The rate of interest becomes sticky and cannot decline further after reaching a critically low level because of the following reasons:
1.Compensation for Cost and Inconvenience:
Investing in bonds involves certain cost and inconvenience and some minimum return (in the form of interest earning) is required to neutralise this cost and inconvenience. So rate of interest must remain positive and cannot become zero.
2.Possibility of Rise in Interest Rate:
When the rate of interest reaches its lowest level, there is every possibility that it will increase and the bond prices will fall in the near future. The speculators will under such circumstances prefer to sell their already held bonds, postpone their purchases of new bonds and keep money with them.
3.Expectation of Capital Gains:
At the very low level of interest rate, the investors hope that the rate of interest will increase and reach its normal level. A rise in the interest rate from an extremely low level involves ‘ greater capital losses than a rise in the interest rate from a relatively higher level.
4.Preference for Money:
At the very low level of rate of interest, people develop a strong preference for holding wealth in the form of money rather than in the form of bonds and securities.
The policy implication of the liquidity trap is that the rate of interest cannot be lowered any more and the monetary policy becomes ineffective in the liquidity trap region of the speculative demand for money curve. Changes in the money supply will have no effect on the interest rate.
During such periods, interest rates arc already very low and the economy is in the flatter ranges of the speculative demand for money curve, and therefore, changes in the money supply cannot further reduce the rate of interest.
Thus, expansionary monetary policy is ineffective during depression. The analysis of the liquidity trap, therefore, explains why Keynes considered monetary policy ineffective and hence favoured fiscal policy which influences aggregate demand and in turn employment and output through changes in government expenditure and taxes, leaving the rate of interest unaffected.
1. In commercial vehicle layouts engine is located forward, rear or under floor mainly to
a. Better utilization of space
b. Increase fuel economy
c. Better weight distribution
d. Reduce the weight of chassis Answer: c
2. The type of air cycle used in diesel engine is called
a. Otto cycle
b. Carnot cycle
c. Diesel cycle
d. Rankine cycle Answer: c
3. During suction stroke the pressure inside the cylinder is
a. Equal to atmospheric pressure
b. Above atmospheric pressure
c. Above or below atmospheric pressure
d. Below atmospheric pressure Answer: d
4. During compression stroke the air is compressed according to
a. Isothermal process
b. Hyperbolic process
c. Adiabatic process
d. Constant pressure process Answer: c
5. The heat is added in the cycle at
a. Constant pressure
b. Constant volume
c. Approximately constant pressure and constant volume Answer: c
6. The fuel injected when pressure in the cylinder reaches the point ……….. on the curve
a. 1
b. 2
c. 3
d. 4 Answer: c
7. The crankcase scavenging the the crankcase or underside of the piston acts as
a. An air compressor
b. A blower
c. A ventilator
d. A breather Answer: a
8. The two-stroke engine has valve ports in the
a. Pistons
b. Cylinder walls
c. Piston rings Answer: b
9. The temperature of the piston will be more at
a. The piston walls
b. The crown of the piston
c. The skirt of the piston
d. The piston pin Answer: b
10. Connecting rods are generally of the following from
a. Forged round section steel
b. Cast steel triangular section
c. Forged square section steel
d. Forged I section steel Answer: d
11. For petrol engines the nominal compression ratio will vary between
a. 1 to 2:1
b. 18 to 21:1
c. 1 to 5:1
d. 7.5 to 8.5:1 Answer: d
12. For diesel engines the nominal compression ratio is from
a. 17 to 21:1
b. 7.5 to 8.5:1
c. 30 to 40:1
d. 1 to 5:1 Answer: a
13. One of the major causes of FHP in an engine is
a. High speed
b. High volumetric efficiency
c. Piston-ring friction Answer: c
14. Engine torque is highest at
a. Low speed
b. Intermediate speed
c. High speed Answer: b
15. The maximum pressure of air fuel mixture at the end of compression in petrol engines varies from
a. 10-30 Kg/cm2 b. 30-100 Kg/cm2
c. 6-10 Kg/cm2
d. 100-1000 Kg/cm2 Answer: a
16. When we lift a 10 kg weight, 3 metre we would be doing
a. 300 m kg of work
b. 3 m kg of work
c. 30 m kg of work Answer: c
17. The characteristic of an object which makes it resist any tendency to change its direction of motion is called
a. Inertia
b. Power
c. Internal energy Answer: a
18. The maximum pressure of air at the end of compression in diesel engines is about
a. 10 Kg/cm2
b. 100 Kg/cm2
c. 300 Kg/cm2
d. 30 Kg/cm2 Answer: d
19. As the number of cylinders in multi cylinder engines increases the power to weight ratio ………
a. Remains the same
b. Increases
c. Becomes zero
d. Decreases Answer: b
20. The type of friction generally present in an automotive engine is
a. Viscous friction
b. Greasy friction
c. Dry friction Answer: a
21. The fit of the piston to the cylinder is measured at the
a. Piston skirt
b. Piston head
c. Point of minimum diameter Answer: b
22. Vibration damper ……….
a. controls the torsional vibrations
b. drives the pulley
c. dampens the engine speed
d. reduces the speed of the flywheel Answer: a
23. In a six cylinder engine there is balance of
a. Primary forces only
b. Secondary forces only
c. Both primary and secondary forces Answer: c
24. If the connecting rod longer, the side thrust of the piston is
a. Increased
b. Constant
c. Decreased Answer: c
25. In general the design of the current regulator is such that its main actuating winding carries full
a. Generator voltage
b. Generator output
c. Field current
d. Battery voltage Answer: b
26. Immediately after ignition, combustion chamber temperatures may reach a value of
a. 15000C
b. 55000C
c. 25000C
d. 75000C Answer: a
27. The compression ratio in a diesel engine is as high as
a. 25:1
b. 20:1
c. 10:1
d. 5:1 Answer: b
28. The temperature of the compressed air should be ………….. of the fuel
a. Below the flash point
b. Above the flash point
c. Above the fire point
d. Between the fire and flash point Answer: c
29. The compression pressure in diesel engine is around
a. 30 Kg/cm2
b. 10 Kg/cm2
c. 20 Kg/cm2
d. 40 Kg/cm2 Answer: a
30. The combustion process in a diesel engine is
a. Constant pressure process
b. Isothermal process
c. Constant volume process
d. Adiabatic process Answer: a
31. Which type of valve arrangements require the use of rocket arms?
a. H – head
b. T – head
c. I – head
d. L – head Answer: c
32. The conventional mechanical type fuel pump develops …………. pressure
a. 0.15 Kg/cm2
b. 1.0 Kg/cm2
c. 0.5 Kg/cm2
d. 0.3 Kg/cm2 Answer: b
33. As compression ratio in an engine goes up, the octane requirements of the fuel
a. Goes down
b. Goes up
c. Stay about the same Answer: b
34. The metering rod is designed to vary the size of which jets
a. High speed jets
b. Accelerating jets
c. Float level jets
d. Idle jets Answer: a
35. The turbulence in diesel engines ensures to
a. Increase the volumetric efficiency
b. Increase the compression ratio
c. Bring the fuel quickly in contact with the air
d. Increase the specific fuel consumption Answer: c
36. If compression ratio is increased
a. Thermal efficiency will be increased
b. Volumetric efficiency will be increased
c. Air standard efficiency will be decreased
d. Air standard efficiency will be increased Answer: d
37. In ‘V’ type engines the included angle between two banks of cylinders is
a. 450
b. 600
c. 1300
d. 900 Answer: d
38. The duration of the fuel injection at full load in a diesel engine running at 1800 rpm when it has 200 of crank travel is
a. 1/600 sec
b. 1/640 sec
c. 1/540 sec
d. 1/530 sec Answer: c
39. Comparing a Four wheel drive with Two wheel drive system either at front or rear and assuming an equal division of weight between the two axes
a. From the point of view of traction front wheel drive is better than rear wheel drive
b. Front wheel and rear wheel drive are equal
c. Four wheel drive can always give more traction than either rear or front wheel drive
d. Four wheel drive can utilize all the weight of the vehicle only at a particular road friction Answer: c
40. The range of gear ratios in a vehicle depends on
a. The ratio of engine h.p to laden weight of vehicle
b. Max. engine torque / wt. of vehicle
c. Only on the laden weight of vehicle
d. The power to weight ratio of engine Answer: b
41. Most of the mopeds in India have capacity of
a. 10 cc
b. 250 cc
c. 50 cc
d. 175 cc
e. 150 cc Answer: c
42. Which motor cycle has maximum power rating
a. Rajdoot
b. Jawa
c. Yamaha
d. Bullet Answer: c
43. During a collision the front parts of an automobile are subjected to a deceleration of about ……… at about 50 mphr
a. 100g
b. 1000g
c. 1g
d. 10g Answer: c
44. Piston displacement is calculated from the
a. Cylinder diameter and length
b. Piston length and diameter
c. Bore and stroke Answer: c
45. The power used in overcoming friction in the engine is called
a. FHP
b. BHP
c. IHP Answer: a
46. During combustion the pressure in the cylinder may increase to as much as
a. 50 Kg/cm2
b. 400 Kg/cm2
c. 10 Kg/cm2 Answer: a
47. The size of intake valve is
a. Smaller than that of the exhaust valve
b. Equal to that of the exhaust valve
c. Larger than that of the exhaust valve
d. Not depending upon the size of exhaust valve Answer: c
48. A negative loop in the P.V diagram of an I.C engine is due to
a. Pre ignition in the engine
b. Suction of air for engine
c. Pre opening of the exhaust valve
d. High pressure in the cylinder Answer: b
49. Two stoke engine is preferred for small vehicles because
a. Fuel consumption is low
b. Shock and vibrations are less
c. Its size is small
d. It is easy to control Answer: c
50. Knowing the speed at which an engine is running and the torque it is developing, we can calculate
a. FHP
b. IHP
c. BHP Answer: a
1. The radiator tubes are manufactured by using
a. Cast iron tubes
b. Aluminum tubes
c. Brass tubes
d .Steel tubes Answer: c
2. If we know the engine speed, bore, stroke, number of cylinders and m.e.p in the cylinders, we can calculate
a. FHP
b. IHP
c. BHP Answer: b
3. Knowing the IHP and FHP of an engine, we can calculate
a. Compression ratio
b. rpm
c. SAF
d. BHP Answer: d
4. Which one of the following is not a trade name of tractor in India
a. Kirloskar
b. Escort
c. Standard
d. HMT Answer: c
5. The ratio between the power output of an engine and the energy in the fuel burned to produce that power is called
a. Volumetric efficiency
b. Thermal efficiency
c. Mechanical efficiency Answer: b
6. The air volume in the cylinder with the piston at B.D.C divided by the clearance volume is called
a. Compression ratio
b. Piston displacement
c. Cylinder ratio Answer: a
7. The power used in overcoming friction in the engine is called
a. BHP
b. IHP
c. FHP Answer: c
8. The average pressure during the power stroke minus the average pressure during the intake, compression and exhaust strokes is called
a. IHP
b. Compression ratio
c. BHP
d. m.e.p Answer: d
9. IHP minus FHP equals
a. BHP
b. SAF HP
c. m.e.p Answer: a
10. Engine torque is highest at
a. High speed
b. Low speed
c. Intermediate speed Answer: c
11. BHP divided by IHP is
a. Thermal efficiency
b. Mechanical efficiency
c. Volumetric efficiency Answer: b
12. The percentage of the energy in the petrol burnt in the engine which is actually utilized in propelling the car is as little as
a. 25%
b. 60%
b. 35%
d. 15% Answer: a
13. In the diesel engine, the compression ratio is as high as
a. 10:1
b. 15:1
c. 5:1 Answer: b
14. The device for smoothing out the power impulses from the engine is called the
a. Flywheel
b. Camshaft
c. Crankshaft
d. Clutch Answer: a
15. The amount of air fuel mixture taken in by the engine on the suction stroke is a measure of the engine’s
a. Compression ratio
b. Volumetric efficiency
c. Clearance volume Answer: b
16. The size of an engine cylinder is referred to in terms of its
a. Diameter and bore
b. Bore and length
c. Bore and stroke Answer: c
17. In an operating engine, the hottest part of the piston is the
a. Head
b. Ring grooves
c. Skirt
d. Pin bosses Answer: a
18. In normal operation the part of the exhaust valve that gets the hottest is
a. Face
b. Middle of Stem
c. Centre of head
d. Edge of margin Answer: c
19. The power developed inside the engine cylinder is called
a. IHP
b. FHP
c. BHP Answer: a
20. The ratio of the cylinder volume at BDC and the clearance volume is called
a. Clearance ratio
b. Volumetric ratio
c. Compression ratio Answer: c
21. As a rule when comparing the front and rear wheel cylinder pistons, it will be found that the pistons in the front wheel cylinders are
a. The same size
b. Larger in diameter
c. Smaller in diameter Answer: b
22. Twisting and untwisting of the crankshaft is called
a. Torsional vibration
b. Power impulsion
c. Torsional balance Answer: a
23. The rotating effect of the connecting rod on the connecting rod bearing produces
a. Pressure load
b. Inertia load
c. Centrifugal load Answer: c
24. Important bearing characteristics include
a. Embeddability, compression and fatigue
b. Exbeddability, conformability and fatigue resistance Answer: b
25. In the engine there must be relative motion between the piston and the connecting rod
a. Atmospheric pressure, inertia and torsional vibration
b. Centrifugal force, inertia and combustion pressure
c. Inertia, engine speed and centrifugal force Answer: b
26. Two of the three connecting rod bearing loads that increase as engine speeds increase are
a. Centrifugal and inertia loads
b. Torsional and pressure loads
c. Pressure and inertia loads
d. Pressure and centrifugal loads Answer: a
27. When different forces act at angles on connecting rod bearing, the combining of these forces produces a
a. Remaining force
b. Canceling force
c. Resultant force Answer: c
28. The active material in a charged negative plate is
a. Lead sulphate
b. Lead peroxide
c. Lead metal
d. Lead per chloride Answer: c
29. The tree general types of friction bearings are
a. Journal, ball and roller
b. Journal, guide and thrust
c. Journal, shaft and thrust Answer: b
30. Petrol and Gasoline is called a hydrocarbon because it consists essentially of
a. Carbon and Hydrogen
b. Oxygen and Hydrogen
c. Carbon and Oxygen Answer: a
31. Almost all bearing used in automotive engines are
a. Guide bearings
b. Friction bearings
c. Antifriction bearings Answer: b
32. The brake shoes are curved to conform to the inner diameter of the
a. Tyre
b. Wheel
c. Pedal
d. Brake drum Answer: d
33. It is cheaper if we use gaskets of
a. Rubber asbestos type
b. Copper asbestos type
c. Steel asbestos type Answer: a
34. With an increase in temperature the resistance of carbon is
a. Unchanged
b. Decreased
c. Increased Answer: c
35. When petrol burns completely, two of the compounds that are formed are
a. Carbon dioxide and water
b. Water and oxygen
c. Hydrocarbon and oxygen Answer: a
36. Due to heat of combustion, with increase in temperature the molecules
a. Move slower
b. Vaporize
c. Move faster Answer: c
37. When air is heated, it
a. Contracts and becomes heavier
b. Expands and becomes heavier
c. Expands and becomes lighter Answer: c
38. Changing position of an object against an opposing force is called
a. Power
b. Torque
c. Energy
d. Work Answer: d
39. A liquid that boils at a relatively high temperature is said to have
a. A low viscosity
b. A high viscosity
c. A high volatility
d. A low volatility Answer: d
40. The ease with which a liquid changes to a vapour is called its
a. Vapourability
b. Boiling point
c. Viscosity
d. Volatility Answer: d
41. The pump part that rotates and causes water circulation between the radiator and engine is called
a. Impeller
b. Fan
c. Bypass Answer: a
42. The bearing having the least friction is the
a. Sleeve bearing
b. Antifriction bearing
c. Friction bearing Answer: b
43. Conform ability of an engine bearing is
a. Ability of a bearing to withstand the wear and tear
b. Resistivity to corrosion
c. Ability of the bearing to adjust itself to variations in shaft alignment and journal shape
d. Ability of a bearing to permit foreign particles to embed in it Answer: c
44. The most commonly used material for tyre tubes is
a. Butyl
b. Natural rubber
c. Butane Answer: a
45. When the plates of battery cell are made larger in size, we get increased …………
a. Current
b. Voltage
c. Cell resistance Answer: a
46. When preparing electrolyte, it is important to remember that
a. Acid and water should be poured together
b. Water should be poured into acid
c. Acid should be poured into water Answer: c
47. Aluminium alloy pistons are preferred because
a. They are good absorbers of shock
b. They are having less weight
c. They have good water resistance
d. They are very strong in tension Answer: b
48. The material used for the piston of modern passenger cars are
a. Brass pistons
b. Cast iron pistons
c. Aluminiun alloy pistons
d. Steel pistons Answer: c
49. Piston compression rings are manufactured by
a. Aluminium
b. Cast iron
c. Steel
d. Bronze Answer: b
50. Gudgeon pins or piston pins are made by
a. Piston material itself
b. Cork
c. Cast iron
d. Hardened and ground steel Answer: d
1. The brake pipe in hydraulic brakes is made up of
a. PVC
b. Steel
c. Rubber
d. Copper Answer: b
2. The ease with which a liquid vapourizes is called its
a. Volatility
b. Octane rating
c. Vapourability Answer: a
3. As the battery is discharged, the active materials in both negative and positive plates are changed to
a. Spongy lead
b. Sulphuric acid
c. Lead oxide
d. Lead sulphate Answer: d
4. The pipes used in diesel engines from pump to nozzle is made up of
a. PVC
b. Rubber
c. Steel
d. Copper Answer: c
5. Two types of antifreeze are
a. Iso octane and ethylene glycol
b. Alcohol base and ethylene glycol
c. Ethylene glycol and propylene glycol Answer: b
6. The substance added to the oil which helps to keep the engine clean is called
a. Grease
b. Thickening agent
c. Soap
d. Detergent Answer: d
7. One advantage of using an exhaust valve as insert is that the ring
a. Withstands high exhaust gas temperature better
b. Is more easily machined
c. Wears in more quickly Answer: a
8. The crankshafts are usually forged to get
a. Minimum friction effects
b. A good mechanical design
c. Good grain structure
d. Improved corrosion structure Answer: b
9. The number of parallel paths in a lap winding of the armature of a DC generator is equal to
a. Half the number of poles
b. Number of poles
c. Two Answer: b
10. The unsprung mass in a vehicle system is mainly composed of
a. The frame assembly
b. Gear box and propeller shaft
c. Axle and the parts attached to it
d. Engine and associated parts Answer: c
11. Parts of the shock absorber include
a. Valves
b. Coupler
c. Valve springs
d. Pistons Answer: a
12. The automobile chassis consists of the engine, frame, power train, wheels, steering and …………..
a. The doors
b. Luggage boot
c. Wind shield
d. Braking system Answer: d
13. The frame provides support for the engine body, power train members and …….
a. Wheels
b. Jack
c. Road Answer: a
14. The engine is usually supported by the frame
a. Four or five
b. One or two
c. Three or four
d. One or two Answer: c
15. The central part of the axle beam is offset downwards to
a. Give improved resistance to end thrusts during cornering
b. Give better bending strength
c. Give improved torsional strength during brake application
d. Clear the engine sump and lower vehicle centre of gravity Answer: d
16. X – member of a car frame ensures improved
a. Resistance to side force due to transverse wind load
b. Bending strength of side members
c. Resistance to vertical shock loads acting simultaneously on both front wheels
d. Resistance of weaving and torsional strength of front end of frame Answer: a
17. The purpose of the shock absorbers is to
a. Strengthen frame
b. Damp spring oscillations
c. Improve rigidity of spring mountings Answer: b
18. The rear end suspension arrangement in which rear end torque is absorbed by the spring is called the
a. Torque tube drive
b. Hooks drive
c. Differential drive
d. Hotchkiss drive Answer: d
19. On rebound, in the direct acting shock absorber, fluid flows out of the upper part of the cylinder and also ………..
a. Out of the dust shield
b. Out of the reservoir
c. Into the reservoir
d. Into the dust shield Answer: b
20. The weight or pressure required to deflect a spring in mm is called the spring
a. Weight
b. Deflection
c. Rate
d. Rebound Answer: c
21. Leaf spring for vehicles are nipped to
a. To vary the effective length of the spring
b. To increase the interleaf friction
c. Improve the load carrying capacity of spring
d. Ensure that all leaves are uniformly stressed during loading Answer: d
22. The device that permits variation in the distance between the spring eyes of a leaf spring as the spring
flexes is called
a. Spring shackle
b. Spring U – bolt
c. Spring hanger
d. Spring leaf Answer: a
23. When the direct acting shock absorber is compressed or telescoped fluid passes through the piston orifices into the upper part of the cylinder and also
a. Into the dust shield
b. Out of the dust shield
c. Into the reservoir
d. Out of the reservoir Answer: c
24. The clips placed at intervals along some leaf spring to prevent spring leaf separation on rebound, are
called
a. Rebound clips
b. Separation clips
c. Interval clips
d. Relief clips Answer: a
25. In a vehicle with torque tube drive, the rear suspension spring
a. Takes up driving thrust and torque reaction
b. Supports load and takes up end thrust
c. Takes up braking thrust and torque reaction
d. Takes up end thrust and torque reaction Answer: b
Automobile Engineering Interview Questions and Answers for Competitive Exams
26. With a leaf spring type of suspension, interference between steering and suspension system can be
reduced to minimum when
a. Front end of the spring is pin joined and the rear end is shackled
b. Front end of the spring is shackled and rear end is pin jointed
c. Both end of the spring are shackled
d. Both ends of the springs are pin jointed Answer: b
27. The laminated spring, which is in common use, is of the type
a. Full elliptic
b. Semi elliptic
c. One quarter elliptic
d. Three quarter elliptic Answer: b
28. A double acting shock absorber usually has
a. Unequal pressure acting on either sides
b. Equal pressure on either side
c. Pressure acting only on one side Answer: a
29. Hotchkiss drive is the name associated with
a. A type of automatic transmission
b. The kind of drive for independent suspension axles
c. A means of taking up torque and thrust by leaf springs
d. A type of gear box Answer: b
30. The part of the vehicle holds the passengers and the cargo to be transported is known as
a. Hull
b. Chassis
c. Cabin
d. Sedan Answer: a
31. The power train includes the clutch, propeller shaft, differential and …………….
a. Steering gear
b. Front axles
c. Chassis
d. Transmission Answer: d
32. In gear systems, speed reduction means torque
a. Stabilization
b. Increase
c. Reduction Answer: b
33. Clutch slippage while clutch is engaged is particularly noticeable
a. When starting the engine
b. During acceleration
c. During idle
d. At low speed Answer: b
34. Clutch chattering or grabbing is noticeable
a. At low speed
b. When engaging the clutch
c. When accelerating
d. During idle Answer: d
35. Clutch noises are usually most noticeable when the engine is
a. Being started
b. Decelerating
c. Idling
d. Accelerating Answer: c
36. Synchronizing devices are designed to prevent gear clash when shifting into
a. First and second
b. Second and high
c. First and reverse Answer: b
37. The overdrive is located between the
a. Transmission and the propeller shaft
b. Planetary gears and clutch
c. Transmission and clutch Answer: b
38. The sun gear in the planetary gear system meshes with the
a. Pinion cage
b. Ring gear
c. Clutch gear
d. Planet pinions Answer: d
39. Pressing down on clutch pedal causes the release levers to move the pressure plate away from
a. Friction disc
b. Clutch cover
c. Pressure plate baffle
d. Throw out bearing Answer: a
40. In coil spring type of clutch the cover is separated by
a. Removing three screws or nuts
b. Unhooking three retainer springs
c. Removing wire coil springs
d. Detaching three lever springs Answer: a
41. In the high gear in the transmission, main shaft turns at the same speed as the
a. Idler shaft
b. Counter shaft
c. Clutch shaft Answer: c
42. The purpose of the fluid coupling is to act as a
a. Automatic gear changer
b. Flexible power transmitting coupling
c. Synchronizing device Answer: b
43. In the fluid coupling oil passes from the driving to the
a. Gear
b. Coupling
c. Vanes
d. Driven member Answer: d
44. Braking is produced by the frictional effect between the brake drum and the
a. Wheel studs
b. Wheel rim
c. Brake shoes
d. Wheel cylinder pistons Answer: c
45. The drive pinion in the over running clutch is moved into mesh for cranking action by
a. A shaft lever
b. Sleeve turning in pinion
c. Pinion inertia Answer: c
46. The function of a torque converter or fluid converter is similar to that of a
a. Gear box
b. Clutch
c. Shock absorber
d. Torsion box Answer: a
47. In the transmission system, the provision of slip joints allows a change in the
a. Angle of drive
b. Length of shaft
c. Speed of rotation Answer: b
48. In the torque converter, oil leaving the turbine is changed into a helping direction by curved
a. Pump vanes
b. Stator vanes
c. Turbine vanes Answer: b
49. In a fluid coupling the greater the difference between the speeds of the driving and the driven member
a. Higher the coupling efficiency
b. The lower the turbulence
c. The lower the coupling efficiency Answer: c
50. The ratio between the speed of the camshaft and the speed of the crankshaft is
a. 1:1
b. 1:4
c. 1:2
d. 1:1/4 Answer: b
1. The free wheeling mechanism contains
a. A planetary gear
b. A transmission
c. An over running clutch
d. A propeller shaft Answer: c
2. For each crankshaft revolution, the cam shaft revolves
a. one half-turn
b. one turn
c. two turns
d. four turns Answer: a
3. The overdrive is located between
a. Gear box and clutch
b. Gear box and propeller shaft
c. Planetary gears and clutch Answer: b
4. The synchronizing device used in the transmission uses
a. Cone braking surfaces
b. Flat braking surfaces
c. Synchronizing pins Answer: a
5. The second movement of the gear shift lever produces
a. The correct gears to mesh
b. The movement of the drive gear
c. Release of clutch Answer: a
6. There are two separate movements of the gear shift lever for changing the gears.
The first movement selects
a. The shaft to be moved
b. The shaft pedal to be moved
c. Shifter fork which operates gear assembly to be moved Answer: c
7. The standard transmission has
a. One shifter fork
b. Two shifter forks
c. Three shifter forks
d. Four shifter forks Answer: c
8. The conventional motor car has
a. Two forward speeds
b. Three forward speeds
c. Four forward speeds Answer: c
9. In the transmission, the reverse idler gear always mesh with
a. Counter shaft drive gear
b. Counter shaft low gear
c. Main shaft reverse gear
d. Counter shaft reverse gear Answer: d
10. In transmission reduction of speed is always used to obtain
a. Reduction of torque
b. Constant torque to drive the wheels
c. Increase of torque Answer: c
11. The device that produces different gear ratios in the power train is called
a. Differential
b. Transmission
c. Speed Changer Answer: b
12. In the automobile, the power train carries the engine power from the engine to the rear wheels. The power
train includes the clutch propeller shaft, differential and
a. Front axis
b. Steering gear
c. Gear box
d. Chassis Answer: c
13. In the coil spring type of clutch when the pressure plate and cover are separated, the spring pressure must
be held by
a. Hand
b. An arbor press
c. A lever
d. A heavy weight Answer: b
14. Parts of the clutch that should not be cleaned in solvent include the
a. Friction disc and throw out bearing
b. Friction disc cover
c. Throw out bearing and springs
d. Release levers and springs Answer: a
15. On diaphragm spring clutch, pressing down on the clutch pedal moves throw out bearing in against the
a. Release levers
b. Diaphragm
c. Pressure plate
d. Friction disc Answer: a
16. As a general rule in facings on the friction disc are worn down to the rivet heads
a. Rivets should be
replaced
b. The friction disc should be replaced
c. The clutch should be replaced
d. The linkage should be adjusted Answer: b
17. The front end of the clutch shaft is supported in a pilot bearing in the
a. Throw out bearing
b. Friction disc
c. Crankshaft
d. Transmission Answer: c
18. The three forward speed and the reverse transmission consists of three shafts and
a. Three gears
b. Five gears
c. Eight gears
d. Ten gears Answer: c
19. Synchromesh devices in the transmission synchronize the gears about to be
a. Meshed
b. De-meshed
c. Stopped Answer: a
20. In the transmission the counter shaft drive gear is meshed with a gear on the
a. Output shaft
b. Main shaft
c. Clutch shaft Answer: b
21. The fluid coupling is most efficient as drive ratio approaching to
a. 1:1
b. 2:1
c. 1:5:1
d. 1:3 Answer: a
22. In the fluid coupling speed reduction means
a. torque reduction
b. torque increase
c. power increase Answer: a
23. When the clutch is engaged, spring pressure clamps the friction disc between the pressure plate and the
a. Flywheel
b. Differential
c. Reaction plate
d. Clutch pedal Answer: a
24. The free travel of the medal, or pedal lash is the amount of travel the pedal has before the throw out
bearing comes up against the
a. Release levers
b. Flywheel
c. Floor board
d. Stop Answer: a
25. The automobile transmission is removed from the car by taking it out
a. From under car
b. Through driving compartment
c. Through engine compartment Answer: a
Automobile Engineering Objective Type Interview Questions Pdf | Preparation for GATE Exams
26. Overdrive is provided in the transmission of a vehicle to
a. Reach higher road speeds
b. improved fuel consumption
c. achieve better acceleration
d. carry more load Answer: b
27. The number of gear ratios in a vehicle
a. Is more with high powered vehicle
b. Is less with high powered cars
c. Is more with diesel engine heavy vehicles
d. is more with petrol engine typical American Car Answer: a
28. In the process of gear shifting in a layshaft type of gearbox
a. An upchange say third to Top Gear requires speeding up of lay shaft
b. An up change requires slowing down the layshaft
c. An upchange or down change is not accompanied by changes in layshaft speed
d. Gear shifting involves change of speed only in down shifts Answer: b
29. A fluid coupling
a. Acts like flywheel and replaces it since as it is known also by the name fluid wheel
b. It takes the place of friction clutch and replaces it completely in synchromesh transmission systems
c. It replaces the friction clutch and the Gearbox also
d. Does the function of a clutch automatically, but cannot be used for shifting transmission to effect Gear changes Answer: d
30. The main advantage of a fluid coupling is
a. In its low torque capacity at low speeds
b. Steady state torque characteristic
c. Due to its ability to slip
d. Due to its ability to function fluid medium Answer: c
31. The hydrodynamic torque converter
a. Gives a continuous variation of torque with increase of output speed
b. Enables to get the max. h.p continuously
c. Gives a speed variation without torque variation
d. Maintains a high efficiency throughout the operating speed range Answer: a
32. An automatic transmission works on the principle of
a. Centrifugal device making up changes proportional to road speed
b. Centrifugal device connected to crankshaft making up changes prop. to engine speed
c. Makes changes depending on throttle position in conjunction with road speed governor
d. Makes gear changes at equal intervals or set road speeds Answer: c
33. The coil springs are located in between the pressure plate and the
a. Clutch cover
b. Disc assembly
c. Pressure plate baffle
d. Flywheel Answer: a
34. The clutch cover is bolted to the
a. Friction disc
b. Flywheel
c. Car frame
d. Engine block Answer: b
35. The friction disc is positioned between the flywheel and the
a. Engine
b. Crankshaft
c. Pressure plate Answer: c
36. There is a double faced friction disc splined to a shaft in the
a. Transmission
b. Differential
c. Engine
d. Clutch Answer: d
37. To prevent distortion on re-installation on the clutch cover attaching bolts should be tightened
a. One at a time
b. Evenly
c. Until springs begin to compress
d. Until springs are expanded Answer: b
38. The power train transmits power from the engine to the
a. Crank shaft
b. Rear wheels
c. Front wheels
d. Steering gear Answer: b
39. The clutch pressure plate is mounted on the
a. Flywheel
b. Clutch cover
c. Friction disc
d. Crankshaft Answer: b
40. The release levers in a typical clutch pivot on
a. Springs
b. Levers
c. Threaded levers
d. Pins Answer: d
41. If two meshing gears have 4:1 gear ratio and the smaller gear has 12 teeth, the large gear will have
a. 12 teeth
b. 24 teeth
c. 36 teeth
d. 48 teeth Answer: d
42. The two meshed gears have a gear ratio of 3:1. Every time the larger gear turns once the small gear will
be to turn
a. 1/3 time
b. one
c. three times Answer: c
43. In the diaphragm clutch inward movement of the throw out bearing causes the diaphragm spring to
a. Dish inward
b. Expand
c. Contract Answer: a
44. The fluid coupling has maximum efficiency when driving and driven members are turning at
a. High speed
b. Low speed
c. Different speed
d. About the same speed Answer: a
45. The purpose of the guide ring in the fluid coupling is to reduce oil
a. Movement between the members
b. Turbulence
c. Level in coupling Answer: b
46. Synchronizing is designed to prevent gear clash when shifting into
a. First and reverse
b. First and second
c. Second and high Answer: c
47. When shifting into low, a gear on the transmission main shaft is moved in to mesh with the
a. Counter shaft low gear
b. Counter shaft idler
c. Clutch gear
d. Output gear Answer: a
48. Clutch noises are usually most noticeable when the engine is
a. Accelerating
b. Decelerating
c. Idling
d. Being started Answer: c
49. Clashing of gears when shifting into high could result from
a. Engine misalignment
b. Drive key sheared
c. A defective Synchronizer Answer: c
50. Transmission noise in neutral could result from
a. Worn gears
b. Loose propeller shaft
c. Misadjusted gear linkage Answer: a
1. The purpose of the fluid coupling is to act as a
a. Synchronizing device
b. Automatic gear changer
c. Flexible power-transmitting coupling Answer: c
2. The distance between adjacent meshing teeth of mating gears is called
a. Clearance
b. Back lash
c. Flank Answer: b
3. In the fluid coupling, speed reduction means torque reduction. But in the torque converter, speed reduction means
a. Torque increase
b. Torque loss
c. Power increase Answer: a
4. The fluid coupling consists essentially of two
a. Doughnuts
b. Vane members
c. Guide rings
d. Driving shafts Answer: b
5. The number of planetary gear sets in a hydromatic transmission system is
a. Two
b. Three
c. Four
d. Five Answer: c
6. When coming out of overdrive, the overdrive electric control momentarily
a. De clutches the engine
b. Interrupts the ignition system action
c. De meshes the sun gear Answer: b
7. In order for power to flow through the fluid coupling from the engine to car wheels, the driving member
must be turning
a. Slower than driven member
b. At same speed as driven member
c. Faster than driven member Answer: c
8. In the overdrive, there is an arrangement whereby it is possible to lock stationary the
a. Ring gear
b. Sun gear
c. Planet pinion cage Answer: b
9. The coil spring clutch may use from
a. Two to six springs
b. Three to nine springs
c. Four to eight springs
d. Ten to twelve springs Answer: b
10. If the differential noise is present only when the car is rounding a curve the trouble would be due to
a. Heavy heel contact on gear teeth
b. Heavy toe contact on gear teeth
c. Binding in differential case Answer: c
11. To correct heavy flank contact on the ring gear teeth
a. Move the drive pinion in
b. Move the drive pinion out
c. Move the ring gear out
d. Adjust back lash as necessary Answer: c
12. The ring gear is adjusted in the differential by use of
a. Selective washers of proper thickness
b. Bearing adjuster
c. Adjusting screws Answer: a
13. The axle bevel gears in the differential mesh with the
a. Differential pinion gears
b. Ring gear
c. Drive pinion
d. Main gear Answer: a
14. The ring gear is mounted on the
a. Differential housing
b. Differential carrier
c. Differential case
d. Axle housing Answer: d
15. The outer end of the axle is supported by a
a. Spring seat
b. Sleeve bearing
c. Housing bracket
d. Ball or roller bearing Answer: d
16. When the axle is pulled the bearing
a. Stays in the housing
b. Stays in the differential
c. Comes out with it Answer: a
17. In the differential the ring gear is bolted to the
a. Differential housing
b. Differential case
c. Axle housing
d. Drive pinion Answer: b
18. The slip joint permits a change in the
a. Length of shaft
b. Speed of rotation
c. Angle of drive Answer: a
19. The centre part of a typical universal joint is called the
a. Trunnion
b. Joint
c. Bearing
d. Spider Answer: d
20. To take care of the difference in the driving angle as rear axle moves up and down, the propeller shaft has
one or more
a. Slip joint
b. Elbow joint
c. Release joint
d. Universal joints Answer: d
21. In the modern differential, the type of gearing used for the drive pinion and ring gear is
a. Spur
b. Spiral bevel
c. Hypoid Answer: c
22. The propeller shaft has one or more
a. Spur gears
b. Elbow joints
c. Universal joints
d. Fluid couplings Answer: c
23. There is a tendency for the rear axle housing to rotate in a direction opposite to the direction of the rear
wheels and this effect is due to
a. The torque tube
b. Acceleration
c. Rear end torque Answer: c
24. In the slip joint, slippage occurs between internally and externally mated
a. Couplings
b. joints
c. Splines Answer: c
25. If a noise is present in a differential only when the car moves past a curve, the chances are that the trouble
is due to some fault in
a. Drive pinion assembly
b. Differential case assembly
c. Wheel bearing Answer: b
26. In the differential to correct for heavy face contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive pinion out
c. Drive gear out and then adjust backlash Answer: a
27. In the differential, to correct for heavy flank contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive pinion out
c. Drive gear out and then adjust back lash Answer: c
28. In the differential, to correct for heavy heel contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive gear towards pinion
c. Drive gear away from pinion and adjust back lash Answer: a
29. In the differential, to correct for heavy toe contact on the drive gear teeth, it is necessary to move the
a. Drive gear towards pinion
b. Drive pinion gear away from pinion
c. Drive pinion out and adjust back lash Answer: c
30. The drive gear in the differential is adjusted by use of
a. Selective washers of proper thickness
b. Adjustment nuts
c. Adjustment screws Answer: a
31. The type of rear axle in which the wheel end is supported by bearings inside the axle housing is
a. Semi floating axle
b. Three-quarter floating axle
c. Full-floating axle Answer: a
32. The two basic types of axle are
a. Dead and floating
b. Dead and live
c. Floating and semi floating Answer: b
33. In the differential, the ring gear is bolted to the
a. Differential housing
b. Differential case
c. Drive pinion
d. Axle shaft Answer: b
34. In the Hotchkiss drive, the rear end torque is absorbed by the
a. Torque tube
b. Rear springs
c. Radius rods Answer: b
35. The universal joint permits a change in the
a. Length of the shaft
b. Speed of rotation
c. Angle of drive Answer: c
36. To correct heavy heel contact on the ring gear teeth, move the
a. Drive pinion in
b. Ring gear towards pinion
c. Ring gear away from pinion and adjust backlash Answer: a
37. Propeller shaft includes
a. Universal joint
b. Knee joint
c. Slip joint Answer: a
38. A humming noise in the differential is often caused by improper tooth contact between the
a. Drive pinion & ring gear
b. Axle and side gear
c. Pinion and side gears Answer: a
39. Axle shaft of the three-quarter floating axle is subjected to
a. Bending stress only
b. Torsional stress only
c. Bending and torsional stress
d. Torsional stress and stress due to axial force during cornering Answer: b
40. Whirling of the propeller shafts is mainly due to
a. The transmission of torsional vibration of the crankshaft
b. The use of a sliding joint in the propeller shaft
c. The use of universal joints in the drive
d. Lack of balance and excessive length of propeller shaft Answer: d
41. In a vehicle with dual rear axle, the wheel base is measured from the
a. Axis of the front wheel to the nearest rear wheel axis
b. Axis of the front wheel to the farthest rear wheel axis
c. Rear of cab to farthest rear wheel axis
d. Axis of the front wheel to an axis midway between the axes of rear wheels Answer: c
42. The axle shaft of a semi floating rear axle is subjected to
a. Axial thrust only
b. Axial thrust and bending stress
c. Torsional stress only
d. Bending, torsional stresses and end thrust Answer: d
43. Differential mechanism at the axle is provided mainly to
a. Enable the vehicle go round corners
b. Equalize the division of torque between the two wheels c. To provide a reduction ratio
d. To turn the drive through a right angle Answer: a
44. De Dion axle is usually
a. Used at the front of heavy vehicles
b. A kind of axle in which the differential and final drive gears are supported in the frame
c. A two speed axle drive suited for heavy vehicles
d. The popular drive for 2 wheeler Answer: b
45. Spur gear type of differential is unsuitable for passenger car applications because
a. It results in a very costly rear axle assembly
b. The large transmission losses due to spur gears
c. Large dimension of final drive housing resulting in reduced ground clearance
d. Centre of gravity of the vehicle is raised Answer: d
46. Floating axles are classified on the basis of
a. The amount of torque transmitted
b. Depending upon their location whether at front or rear
c. Depending on the nature of forces like torsional vertical and lateral to which they are subjected
d. Purely on the basis of type and number of bearings used at the work Answer: c
47. Which of the following layouts is not used in motor vehicles?
a. Front engine front drive
b. Front engine rear drive
c. Rear engine front drive
d. Rear engine rear drive Answer: c
48. The most popular drive at the drive axle for the passenger car is
a. Straight bevel gear
b. Spiral bevel gear
c. Worm gear drive
d. Hypoid drive Answer: d
49. The drive line consists of the propeller shaft with
a. Drive and universal joints
b. Universal joints and slip joints Answer: b
50. In the differential the ring gear is attached to the
a. Bevel gear
b. Drive gear
c. Differential case
d. Propeller shaft Answer: c
26. In trucks the system of wheel braking employed is
(a) Mechanical
(b) Hydraulic
(c) Pneumatic Answer: c
27. In jeeps we use
(a) Mechanical brakes
(b) Hydraulic brakes
(c) Air brakes Answer: b
28. In a vacuum type servo-assisted brake system, vacuum is available in …….. is made use of
(a) Exhaust manifold
(b) Combustion chamber
(c) Water jackets
(d) Inlet manifold Answer: d
29. The approximate ratio of effort applied : effort available from servo system is (a) 1:1
(b) 3:1
(c) 1:4
(d) 10:1 Answer: b
30. Due to continuous running on a hot day the temperature of the braking fluid will increase, hence some
braking torque is applied on brake shoes, to avoid this a small quantity of fluid will be allowed to escape
into the master cylinder through
(a) Intake port
(b) Exhaust port
(c) Secondary port Answer: c
31. As the load on the vehicle increase it demands
(a) Increased braking torque
(b) Decreased braking torque
(c) Same braking torque Answer: a
32. In the hydraulic brake system, the movement of a piston in the master cylinder produces hydraulic
pressure which causes movement of
(a) Brake shoe
(b) Brake pedal
(c) Brake cam Answer: a
33. In the case of brake linings saturants and bonding materials are used to
(a) Facilitate moulding and curing of brake linings
(b) To improve the heat dissipating capacity of linings
(c) To give a constant coefficient of friction up to 800 C
(d) To make the lining material impervious to moisture and oil and to ensure a steady coefficient of friction up to 3000 C Answer: a
34. Brake lining area required for shoe brakes for trucks is mainly based on
(a) Average truck speed
(b) Frequency of brake applications
(c) Gross vehicle weight
(d) Material used for brake drums Answer: c
35. The working fluid normally used in hydraulic brake systems is
(a) High speed diesel oil along with alcohol
(b) SAE 20 oil with anti-corrosion additives
(c) A mixture of vegetable oil and SAE 10 oil
(d) A solution of castor oil in alcohol along with neutralizer Answer: d
36. Movement of the brake pedal forces brake fluid from the master brake cylinder through brake lines and into the
(a) Brake shoes
(b) Wheel cylinders
(c) Brakes cables
(d) Pedal rod Answer: b
37. During braking the brake shoe is moved outward to press against the
(a) Wheel piston or cylinder
(b) Brake lining
(c) Brake drum or disc
(d) Wheel rim or axle Answer: c
38. In the hydraulic brake system, movement of a piston in the master cylinder produces hydraulic pressure which causes movement of the
(a) Wheel cylinder pistons
(b) Brake pedal
(c) Brake cam Answer: a
39. The radius of a pneumatic tyre is
(a) The radius of unloaded fully inflated tyre
(b) The height of centre of tyre from the ground when it is loaded
(c) Imaginary radius found by measuring the distance per revolution of the loaded tyre
(d) It is fixed radius, based on the dimensions of the tyre Answer: a
40. For a through inspection a tyre should be
(a) On the car
(b) On the wheel
(c) Off the wheel
(d) Inflated Answer: d
41. If a tube of large size than required is installed in a tyre then
(a) The tyre will over expand
(b) The tyre and tube will not fit the rim
(c) The tube will overlap and wear Answer: c
42. Of the four tyres on a car, the one that wears most is the
(a) Right front tyre
(b) Right rear tyre
(c) Left front tyre
(d) Left rear tyre Answer: b
43. To equalize tyre wear, it is suggested that tyres be rotated from one wheel to another every
(a) 80 kms
(b) 8000 kms
(c) 800 kms Answer: b
44. The distance between dual tyres of vehicles is to be correctly spaced to
(a) Ensure proper distribution of load between dual wheels
(b) Reduce over-steering effect
(c) Reduce the slippage between tyre and road while taking a turn
(d) Ensure effective braking Answer: c
45. When an automobile takes a tum to avoid the skidding and over turning
(a) Each wheel will roll independently
(b) Front two wheels will have a common centre during a turning
(c) All the 4 wheels will roll on arcs having a common centre Answer: b
46. Wheels must be balanced
(a) On the car only
(b) Either on or off the car
(c) Off the car only Answer: c
47. Weight can be attached to wheel rim to correct
(a) Wheel alignment
(b) Wheel run out
(c) Wheel balance Answer: c
48. Toe out on turns
(a) Is adjusted by shims
(b) Is adjusted by changing the effective length of the tie rods
(c) Cannot be adjusted Answer: c
49. Caster is defined as the inclination of
(a) Front wheel to the vertical
(b) The king pin axis in the fore and aft plane
(c) The king pin axis in the transverse vertical plane
(d) The axis of stub axle to the horizontal Answer: b
50. The Ackermann steering layout
(a) Makes for safer driving
(b) Enables the driver to feel ahead position
(c) Gives minimum tyre wear
(d) Reduces load on the kingpins and stub axle Answer: a
1. In commercial vehicle layouts engine is located forward, rear or under floor mainly to
a. Better utilization of space
b. Increase fuel economy
c. Better weight distribution
d. Reduce the weight of chassis Answer: c
2. The type of air cycle used in diesel engine is called
a. Otto cycle
b. Carnot cycle
c. Diesel cycle
d. Rankine cycle Answer: c
3. During suction stroke the pressure inside the cylinder is
a. Equal to atmospheric pressure
b. Above atmospheric pressure
c. Above or below atmospheric pressure
d. Below atmospheric pressure Answer: d
4. During compression stroke the air is compressed according to
a. Isothermal process
b. Hyperbolic process
c. Adiabatic process
d. Constant pressure process Answer: c
5. The heat is added in the cycle at
a. Constant pressure
b. Constant volume
c. Approximately constant pressure and constant volume Answer: c
6. The fuel injected when pressure in the cylinder reaches the point ……….. on the curve
a. 1
b. 2
c. 3
d. 4 Answer: c
7. The crankcase scavenging the the crankcase or underside of the piston acts as
a. An air compressor
b. A blower
c. A ventilator
d. A breather Answer: a
8. The two-stroke engine has valve ports in the
a. Pistons
b. Cylinder walls
c. Piston rings Answer: b
9. The temperature of the piston will be more at
a. The piston walls
b. The crown of the piston
c. The skirt of the piston
d. The piston pin Answer: b
10. Connecting rods are generally of the following from
a. Forged round section steel
b. Cast steel triangular section
c. Forged square section steel
d. Forged I section steel Answer: d
11. For petrol engines the nominal compression ratio will vary between
a. 1 to 2:1
b. 18 to 21:1
c. 1 to 5:1
d. 7.5 to 8.5:1 Answer: d
12. For diesel engines the nominal compression ratio is from
a. 17 to 21:1
b. 7.5 to 8.5:1
c. 30 to 40:1
d. 1 to 5:1 Answer: a
13. One of the major causes of FHP in an engine is
a. High speed
b. High volumetric efficiency
c. Piston-ring friction Answer: c
14. Engine torque is highest at
a. Low speed
b. Intermediate speed
c. High speed Answer: b
15. The maximum pressure of air fuel mixture at the end of compression in petrol engines varies from
a. 10-30 Kg/cm2 b. 30-100 Kg/cm2
c. 6-10 Kg/cm2
d. 100-1000 Kg/cm2 Answer: a
16. When we lift a 10 kg weight, 3 metre we would be doing
a. 300 m kg of work
b. 3 m kg of work
c. 30 m kg of work Answer: c
17. The characteristic of an object which makes it resist any tendency to change its direction of motion is called
a. Inertia
b. Power
c. Internal energy Answer: a
18. The maximum pressure of air at the end of compression in diesel engines is about
a. 10 Kg/cm2
b. 100 Kg/cm2
c. 300 Kg/cm2
d. 30 Kg/cm2 Answer: d
19. As the number of cylinders in multi cylinder engines increases the power to weight ratio ………
a. Remains the same
b. Increases
c. Becomes zero
d. Decreases Answer: b
20. The type of friction generally present in an automotive engine is
a. Viscous friction
b. Greasy friction
c. Dry friction Answer: a
21. The fit of the piston to the cylinder is measured at the
a. Piston skirt
b. Piston head
c. Point of minimum diameter Answer: b
22. Vibration damper ……….
a. controls the torsional vibrations
b. drives the pulley
c. dampens the engine speed
d. reduces the speed of the flywheel Answer: a
23. In a six cylinder engine there is balance of
a. Primary forces only
b. Secondary forces only
c. Both primary and secondary forces Answer: c
24. If the connecting rod longer, the side thrust of the piston is
a. Increased
b. Constant
c. Decreased Answer: c
25. In general the design of the current regulator is such that its main actuating winding carries full
a. Generator voltage
b. Generator output
c. Field current
d. Battery voltage Answer: b
26. Immediately after ignition, combustion chamber temperatures may reach a value of
a. 15000C
b. 55000C
c. 25000C
d. 75000C Answer: a
27. The compression ratio in a diesel engine is as high as
a. 25:1
b. 20:1
c. 10:1
d. 5:1 Answer: b
28. The temperature of the compressed air should be ………….. of the fuel
a. Below the flash point
b. Above the flash point
c. Above the fire point
d. Between the fire and flash point Answer: c
29. The compression pressure in diesel engine is around
a. 30 Kg/cm2
b. 10 Kg/cm2
c. 20 Kg/cm2
d. 40 Kg/cm2 Answer: a
30. The combustion process in a diesel engine is
a. Constant pressure process
b. Isothermal process
c. Constant volume process
d. Adiabatic process Answer: a
31. Which type of valve arrangements require the use of rocket arms?
a. H – head
b. T – head
c. I – head
d. L – head Answer: c
32. The conventional mechanical type fuel pump develops …………. pressure
a. 0.15 Kg/cm2
b. 1.0 Kg/cm2
c. 0.5 Kg/cm2
d. 0.3 Kg/cm2 Answer: b
33. As compression ratio in an engine goes up, the octane requirements of the fuel
a. Goes down
b. Goes up
c. Stay about the same Answer: b
34. The metering rod is designed to vary the size of which jets
a. High speed jets
b. Accelerating jets
c. Float level jets
d. Idle jets Answer: a
35. The turbulence in diesel engines ensures to
a. Increase the volumetric efficiency
b. Increase the compression ratio
c. Bring the fuel quickly in contact with the air
d. Increase the specific fuel consumption Answer: c
36. If compression ratio is increased
a. Thermal efficiency will be increased
b. Volumetric efficiency will be increased
c. Air standard efficiency will be decreased
d. Air standard efficiency will be increased Answer: d
37. In ‘V’ type engines the included angle between two banks of cylinders is
a. 450
b. 600
c. 1300
d. 900 Answer: d
38. The duration of the fuel injection at full load in a diesel engine running at 1800 rpm when it has 200 of crank travel is
a. 1/600 sec
b. 1/640 sec
c. 1/540 sec
d. 1/530 sec Answer: c
39. Comparing a Four wheel drive with Two wheel drive system either at front or rear and assuming an equal division of weight between the two axes
a. From the point of view of traction front wheel drive is better than rear wheel drive
b. Front wheel and rear wheel drive are equal
c. Four wheel drive can always give more traction than either rear or front wheel drive
d. Four wheel drive can utilize all the weight of the vehicle only at a particular road friction Answer: c
40. The range of gear ratios in a vehicle depends on
a. The ratio of engine h.p to laden weight of vehicle
b. Max. engine torque / wt. of vehicle
c. Only on the laden weight of vehicle
d. The power to weight ratio of engine Answer: b
41. Most of the mopeds in India have capacity of
a. 10 cc
b. 250 cc
c. 50 cc
d. 175 cc
e. 150 cc Answer: c
42. Which motor cycle has maximum power rating
a. Rajdoot
b. Jawa
c. Yamaha
d. Bullet Answer: c
43. During a collision the front parts of an automobile are subjected to a deceleration of about ……… at about 50 mphr
a. 100g
b. 1000g
c. 1g
d. 10g Answer: c
44. Piston displacement is calculated from the
a. Cylinder diameter and length
b. Piston length and diameter
c. Bore and stroke Answer: c
45. The power used in overcoming friction in the engine is called
a. FHP
b. BHP
c. IHP Answer: a
46. During combustion the pressure in the cylinder may increase to as much as
a. 50 Kg/cm2
b. 400 Kg/cm2
c. 10 Kg/cm2 Answer: a
47. The size of intake valve is
a. Smaller than that of the exhaust valve
b. Equal to that of the exhaust valve
c. Larger than that of the exhaust valve
d. Not depending upon the size of exhaust valve Answer: c
48. A negative loop in the P.V diagram of an I.C engine is due to
a. Pre ignition in the engine
b. Suction of air for engine
c. Pre opening of the exhaust valve
d. High pressure in the cylinder Answer: b
49. Two stoke engine is preferred for small vehicles because
a. Fuel consumption is low
b. Shock and vibrations are less
c. Its size is small
d. It is easy to control Answer: c
50. Knowing the speed at which an engine is running and the torque it is developing, we can calculate
a. FHP
b. IHP
c. BHP Answer: a
1. The radiator tubes are manufactured by using
a. Cast iron tubes
b. Aluminum tubes
c. Brass tubes
d .Steel tubes Answer: c
2. If we know the engine speed, bore, stroke, number of cylinders and m.e.p in the cylinders, we can calculate
a. FHP
b. IHP
c. BHP Answer: b
3. Knowing the IHP and FHP of an engine, we can calculate
a. Compression ratio
b. rpm
c. SAF
d. BHP Answer: d
4. Which one of the following is not a trade name of tractor in India
a. Kirloskar
b. Escort
c. Standard
d. HMT Answer: c
5. The ratio between the power output of an engine and the energy in the fuel burned to produce that power is called
a. Volumetric efficiency
b. Thermal efficiency
c. Mechanical efficiency Answer: b
6. The air volume in the cylinder with the piston at B.D.C divided by the clearance volume is called
a. Compression ratio
b. Piston displacement
c. Cylinder ratio Answer: a
7. The power used in overcoming friction in the engine is called
a. BHP
b. IHP
c. FHP Answer: c
8. The average pressure during the power stroke minus the average pressure during the intake, compression and exhaust strokes is called
a. IHP
b. Compression ratio
c. BHP
d. m.e.p Answer: d
9. IHP minus FHP equals
a. BHP
b. SAF HP
c. m.e.p Answer: a
10. Engine torque is highest at
a. High speed
b. Low speed
c. Intermediate speed Answer: c
11. BHP divided by IHP is
a. Thermal efficiency
b. Mechanical efficiency
c. Volumetric efficiency Answer: b
12. The percentage of the energy in the petrol burnt in the engine which is actually utilized in propelling the car is as little as
a. 25%
b. 60%
b. 35%
d. 15% Answer: a
13. In the diesel engine, the compression ratio is as high as
a. 10:1
b. 15:1
c. 5:1 Answer: b
14. The device for smoothing out the power impulses from the engine is called the
a. Flywheel
b. Camshaft
c. Crankshaft
d. Clutch Answer: a
15. The amount of air fuel mixture taken in by the engine on the suction stroke is a measure of the engine’s
a. Compression ratio
b. Volumetric efficiency
c. Clearance volume Answer: b
16. The size of an engine cylinder is referred to in terms of its
a. Diameter and bore
b. Bore and length
c. Bore and stroke Answer: c
17. In an operating engine, the hottest part of the piston is the
a. Head
b. Ring grooves
c. Skirt
d. Pin bosses Answer: a
18. In normal operation the part of the exhaust valve that gets the hottest is
a. Face
b. Middle of Stem
c. Centre of head
d. Edge of margin Answer: c
19. The power developed inside the engine cylinder is called
a. IHP
b. FHP
c. BHP Answer: a
20. The ratio of the cylinder volume at BDC and the clearance volume is called
a. Clearance ratio
b. Volumetric ratio
c. Compression ratio Answer: c
21. As a rule when comparing the front and rear wheel cylinder pistons, it will be found that the pistons in the front wheel cylinders are
a. The same size
b. Larger in diameter
c. Smaller in diameter Answer: b
22. Twisting and untwisting of the crankshaft is called
a. Torsional vibration
b. Power impulsion
c. Torsional balance Answer: a
23. The rotating effect of the connecting rod on the connecting rod bearing produces
a. Pressure load
b. Inertia load
c. Centrifugal load Answer: c
24. Important bearing characteristics include
a. Embeddability, compression and fatigue
b. Exbeddability, conformability and fatigue resistance Answer: b
25. In the engine there must be relative motion between the piston and the connecting rod
a. Atmospheric pressure, inertia and torsional vibration
b. Centrifugal force, inertia and combustion pressure
c. Inertia, engine speed and centrifugal force Answer: b
26. Two of the three connecting rod bearing loads that increase as engine speeds increase are
a. Centrifugal and inertia loads
b. Torsional and pressure loads
c. Pressure and inertia loads
d. Pressure and centrifugal loads Answer: a
27. When different forces act at angles on connecting rod bearing, the combining of these forces produces a
a. Remaining force
b. Canceling force
c. Resultant force Answer: c
28. The active material in a charged negative plate is
a. Lead sulphate
b. Lead peroxide
c. Lead metal
d. Lead per chloride Answer: c
29. The tree general types of friction bearings are
a. Journal, ball and roller
b. Journal, guide and thrust
c. Journal, shaft and thrust Answer: b
30. Petrol and Gasoline is called a hydrocarbon because it consists essentially of
a. Carbon and Hydrogen
b. Oxygen and Hydrogen
c. Carbon and Oxygen Answer: a
31. Almost all bearing used in automotive engines are
a. Guide bearings
b. Friction bearings
c. Antifriction bearings Answer: b
32. The brake shoes are curved to conform to the inner diameter of the
a. Tyre
b. Wheel
c. Pedal
d. Brake drum Answer: d
33. It is cheaper if we use gaskets of
a. Rubber asbestos type
b. Copper asbestos type
c. Steel asbestos type Answer: a
34. With an increase in temperature the resistance of carbon is
a. Unchanged
b. Decreased
c. Increased Answer: c
35. When petrol burns completely, two of the compounds that are formed are
a. Carbon dioxide and water
b. Water and oxygen
c. Hydrocarbon and oxygen Answer: a
36. Due to heat of combustion, with increase in temperature the molecules
a. Move slower
b. Vaporize
c. Move faster Answer: c
37. When air is heated, it
a. Contracts and becomes heavier
b. Expands and becomes heavier
c. Expands and becomes lighter Answer: c
38. Changing position of an object against an opposing force is called
a. Power
b. Torque
c. Energy
d. Work Answer: d
39. A liquid that boils at a relatively high temperature is said to have
a. A low viscosity
b. A high viscosity
c. A high volatility
d. A low volatility Answer: d
40. The ease with which a liquid changes to a vapour is called its
a. Vapourability
b. Boiling point
c. Viscosity
d. Volatility Answer: d
41. The pump part that rotates and causes water circulation between the radiator and engine is called
a. Impeller
b. Fan
c. Bypass Answer: a
42. The bearing having the least friction is the
a. Sleeve bearing
b. Antifriction bearing
c. Friction bearing Answer: b
43. Conform ability of an engine bearing is
a. Ability of a bearing to withstand the wear and tear
b. Resistivity to corrosion
c. Ability of the bearing to adjust itself to variations in shaft alignment and journal shape
d. Ability of a bearing to permit foreign particles to embed in it Answer: c
44. The most commonly used material for tyre tubes is
a. Butyl
b. Natural rubber
c. Butane Answer: a
45. When the plates of battery cell are made larger in size, we get increased …………
a. Current
b. Voltage
c. Cell resistance Answer: a
46. When preparing electrolyte, it is important to remember that
a. Acid and water should be poured together
b. Water should be poured into acid
c. Acid should be poured into water Answer: c
47. Aluminium alloy pistons are preferred because
a. They are good absorbers of shock
b. They are having less weight
c. They have good water resistance
d. They are very strong in tension Answer: b
48. The material used for the piston of modern passenger cars are
a. Brass pistons
b. Cast iron pistons
c. Aluminiun alloy pistons
d. Steel pistons Answer: c
49. Piston compression rings are manufactured by
a. Aluminium
b. Cast iron
c. Steel
d. Bronze Answer: b
50. Gudgeon pins or piston pins are made by
a. Piston material itself
b. Cork
c. Cast iron
d. Hardened and ground steel Answer: d
1. The brake pipe in hydraulic brakes is made up of
a. PVC
b. Steel
c. Rubber
d. Copper Answer: b
2. The ease with which a liquid vapourizes is called its
a. Volatility
b. Octane rating
c. Vapourability Answer: a
3. As the battery is discharged, the active materials in both negative and positive plates are changed to
a. Spongy lead
b. Sulphuric acid
c. Lead oxide
d. Lead sulphate Answer: d
4. The pipes used in diesel engines from pump to nozzle is made up of
a. PVC
b. Rubber
c. Steel
d. Copper Answer: c
5. Two types of antifreeze are
a. Iso octane and ethylene glycol
b. Alcohol base and ethylene glycol
c. Ethylene glycol and propylene glycol Answer: b
6. The substance added to the oil which helps to keep the engine clean is called
a. Grease
b. Thickening agent
c. Soap
d. Detergent Answer: d
7. One advantage of using an exhaust valve as insert is that the ring
a. Withstands high exhaust gas temperature better
b. Is more easily machined
c. Wears in more quickly Answer: a
8. The crankshafts are usually forged to get
a. Minimum friction effects
b. A good mechanical design
c. Good grain structure
d. Improved corrosion structure Answer: b
9. The number of parallel paths in a lap winding of the armature of a DC generator is equal to
a. Half the number of poles
b. Number of poles
c. Two Answer: b
10. The unsprung mass in a vehicle system is mainly composed of
a. The frame assembly
b. Gear box and propeller shaft
c. Axle and the parts attached to it
d. Engine and associated parts Answer: c
11. Parts of the shock absorber include
a. Valves
b. Coupler
c. Valve springs
d. Pistons Answer: a
12. The automobile chassis consists of the engine, frame, power train, wheels, steering and …………..
a. The doors
b. Luggage boot
c. Wind shield
d. Braking system Answer: d
13. The frame provides support for the engine body, power train members and …….
a. Wheels
b. Jack
c. Road Answer: a
14. The engine is usually supported by the frame
a. Four or five
b. One or two
c. Three or four
d. One or two Answer: c
15. The central part of the axle beam is offset downwards to
a. Give improved resistance to end thrusts during cornering
b. Give better bending strength
c. Give improved torsional strength during brake application
d. Clear the engine sump and lower vehicle centre of gravity Answer: d
16. X – member of a car frame ensures improved
a. Resistance to side force due to transverse wind load
b. Bending strength of side members
c. Resistance to vertical shock loads acting simultaneously on both front wheels
d. Resistance of weaving and torsional strength of front end of frame Answer: a
17. The purpose of the shock absorbers is to
a. Strengthen frame
b. Damp spring oscillations
c. Improve rigidity of spring mountings Answer: b
18. The rear end suspension arrangement in which rear end torque is absorbed by the spring is called the
a. Torque tube drive
b. Hooks drive
c. Differential drive
d. Hotchkiss drive Answer: d
19. On rebound, in the direct acting shock absorber, fluid flows out of the upper part of the cylinder and also ………..
a. Out of the dust shield
b. Out of the reservoir
c. Into the reservoir
d. Into the dust shield Answer: b
20. The weight or pressure required to deflect a spring in mm is called the spring
a. Weight
b. Deflection
c. Rate
d. Rebound Answer: c
21. Leaf spring for vehicles are nipped to
a. To vary the effective length of the spring
b. To increase the interleaf friction
c. Improve the load carrying capacity of spring
d. Ensure that all leaves are uniformly stressed during loading Answer: d
22. The device that permits variation in the distance between the spring eyes of a leaf spring as the spring
flexes is called
a. Spring shackle
b. Spring U – bolt
c. Spring hanger
d. Spring leaf Answer: a
23. When the direct acting shock absorber is compressed or telescoped fluid passes through the piston orifices into the upper part of the cylinder and also
a. Into the dust shield
b. Out of the dust shield
c. Into the reservoir
d. Out of the reservoir Answer: c
24. The clips placed at intervals along some leaf spring to prevent spring leaf separation on rebound, are
called
a. Rebound clips
b. Separation clips
c. Interval clips
d. Relief clips Answer: a
25. In a vehicle with torque tube drive, the rear suspension spring
a. Takes up driving thrust and torque reaction
b. Supports load and takes up end thrust
c. Takes up braking thrust and torque reaction
d. Takes up end thrust and torque reaction Answer: b
Automobile Engineering Interview Questions and Answers for Competitive Exams
26. With a leaf spring type of suspension, interference between steering and suspension system can be
reduced to minimum when
a. Front end of the spring is pin joined and the rear end is shackled
b. Front end of the spring is shackled and rear end is pin jointed
c. Both end of the spring are shackled
d. Both ends of the springs are pin jointed Answer: b
27. The laminated spring, which is in common use, is of the type
a. Full elliptic
b. Semi elliptic
c. One quarter elliptic
d. Three quarter elliptic Answer: b
28. A double acting shock absorber usually has
a. Unequal pressure acting on either sides
b. Equal pressure on either side
c. Pressure acting only on one side Answer: a
29. Hotchkiss drive is the name associated with
a. A type of automatic transmission
b. The kind of drive for independent suspension axles
c. A means of taking up torque and thrust by leaf springs
d. A type of gear box Answer: b
30. The part of the vehicle holds the passengers and the cargo to be transported is known as
a. Hull
b. Chassis
c. Cabin
d. Sedan Answer: a
31. The power train includes the clutch, propeller shaft, differential and …………….
a. Steering gear
b. Front axles
c. Chassis
d. Transmission Answer: d
32. In gear systems, speed reduction means torque
a. Stabilization
b. Increase
c. Reduction Answer: b
33. Clutch slippage while clutch is engaged is particularly noticeable
a. When starting the engine
b. During acceleration
c. During idle
d. At low speed Answer: b
34. Clutch chattering or grabbing is noticeable
a. At low speed
b. When engaging the clutch
c. When accelerating
d. During idle Answer: d
35. Clutch noises are usually most noticeable when the engine is
a. Being started
b. Decelerating
c. Idling
d. Accelerating Answer: c
36. Synchronizing devices are designed to prevent gear clash when shifting into
a. First and second
b. Second and high
c. First and reverse Answer: b
37. The overdrive is located between the
a. Transmission and the propeller shaft
b. Planetary gears and clutch
c. Transmission and clutch Answer: b
38. The sun gear in the planetary gear system meshes with the
a. Pinion cage
b. Ring gear
c. Clutch gear
d. Planet pinions Answer: d
39. Pressing down on clutch pedal causes the release levers to move the pressure plate away from
a. Friction disc
b. Clutch cover
c. Pressure plate baffle
d. Throw out bearing Answer: a
40. In coil spring type of clutch the cover is separated by
a. Removing three screws or nuts
b. Unhooking three retainer springs
c. Removing wire coil springs
d. Detaching three lever springs Answer: a
41. In the high gear in the transmission, main shaft turns at the same speed as the
a. Idler shaft
b. Counter shaft
c. Clutch shaft Answer: c
42. The purpose of the fluid coupling is to act as a
a. Automatic gear changer
b. Flexible power transmitting coupling
c. Synchronizing device Answer: b
43. In the fluid coupling oil passes from the driving to the
a. Gear
b. Coupling
c. Vanes
d. Driven member Answer: d
44. Braking is produced by the frictional effect between the brake drum and the
a. Wheel studs
b. Wheel rim
c. Brake shoes
d. Wheel cylinder pistons Answer: c
45. The drive pinion in the over running clutch is moved into mesh for cranking action by
a. A shaft lever
b. Sleeve turning in pinion
c. Pinion inertia Answer: c
46. The function of a torque converter or fluid converter is similar to that of a
a. Gear box
b. Clutch
c. Shock absorber
d. Torsion box Answer: a
47. In the transmission system, the provision of slip joints allows a change in the
a. Angle of drive
b. Length of shaft
c. Speed of rotation Answer: b
48. In the torque converter, oil leaving the turbine is changed into a helping direction by curved
a. Pump vanes
b. Stator vanes
c. Turbine vanes Answer: b
49. In a fluid coupling the greater the difference between the speeds of the driving and the driven member
a. Higher the coupling efficiency
b. The lower the turbulence
c. The lower the coupling efficiency Answer: c
50. The ratio between the speed of the camshaft and the speed of the crankshaft is
a. 1:1
b. 1:4
c. 1:2
d. 1:1/4 Answer: b
1. The free wheeling mechanism contains
a. A planetary gear
b. A transmission
c. An over running clutch
d. A propeller shaft Answer: c
2. For each crankshaft revolution, the cam shaft revolves
a. one half-turn
b. one turn
c. two turns
d. four turns Answer: a
3. The overdrive is located between
a. Gear box and clutch
b. Gear box and propeller shaft
c. Planetary gears and clutch Answer: b
4. The synchronizing device used in the transmission uses
a. Cone braking surfaces
b. Flat braking surfaces
c. Synchronizing pins Answer: a
5. The second movement of the gear shift lever produces
a. The correct gears to mesh
b. The movement of the drive gear
c. Release of clutch Answer: a
6. There are two separate movements of the gear shift lever for changing the gears.
The first movement selects
a. The shaft to be moved
b. The shaft pedal to be moved
c. Shifter fork which operates gear assembly to be moved Answer: c
7. The standard transmission has
a. One shifter fork
b. Two shifter forks
c. Three shifter forks
d. Four shifter forks Answer: c
8. The conventional motor car has
a. Two forward speeds
b. Three forward speeds
c. Four forward speeds Answer: c
9. In the transmission, the reverse idler gear always mesh with
a. Counter shaft drive gear
b. Counter shaft low gear
c. Main shaft reverse gear
d. Counter shaft reverse gear Answer: d
10. In transmission reduction of speed is always used to obtain
a. Reduction of torque
b. Constant torque to drive the wheels
c. Increase of torque Answer: c
11. The device that produces different gear ratios in the power train is called
a. Differential
b. Transmission
c. Speed Changer Answer: b
12. In the automobile, the power train carries the engine power from the engine to the rear wheels. The power
train includes the clutch propeller shaft, differential and
a. Front axis
b. Steering gear
c. Gear box
d. Chassis Answer: c
13. In the coil spring type of clutch when the pressure plate and cover are separated, the spring pressure must
be held by
a. Hand
b. An arbor press
c. A lever
d. A heavy weight Answer: b
14. Parts of the clutch that should not be cleaned in solvent include the
a. Friction disc and throw out bearing
b. Friction disc cover
c. Throw out bearing and springs
d. Release levers and springs Answer: a
15. On diaphragm spring clutch, pressing down on the clutch pedal moves throw out bearing in against the
a. Release levers
b. Diaphragm
c. Pressure plate
d. Friction disc Answer: a
16. As a general rule in facings on the friction disc are worn down to the rivet heads
a. Rivets should be
replaced
b. The friction disc should be replaced
c. The clutch should be replaced
d. The linkage should be adjusted Answer: b
17. The front end of the clutch shaft is supported in a pilot bearing in the
a. Throw out bearing
b. Friction disc
c. Crankshaft
d. Transmission Answer: c
18. The three forward speed and the reverse transmission consists of three shafts and
a. Three gears
b. Five gears
c. Eight gears
d. Ten gears Answer: c
19. Synchromesh devices in the transmission synchronize the gears about to be
a. Meshed
b. De-meshed
c. Stopped Answer: a
20. In the transmission the counter shaft drive gear is meshed with a gear on the
a. Output shaft
b. Main shaft
c. Clutch shaft Answer: b
21. The fluid coupling is most efficient as drive ratio approaching to
a. 1:1
b. 2:1
c. 1:5:1
d. 1:3 Answer: a
22. In the fluid coupling speed reduction means
a. torque reduction
b. torque increase
c. power increase Answer: a
23. When the clutch is engaged, spring pressure clamps the friction disc between the pressure plate and the
a. Flywheel
b. Differential
c. Reaction plate
d. Clutch pedal Answer: a
24. The free travel of the medal, or pedal lash is the amount of travel the pedal has before the throw out
bearing comes up against the
a. Release levers
b. Flywheel
c. Floor board
d. Stop Answer: a
25. The automobile transmission is removed from the car by taking it out
a. From under car
b. Through driving compartment
c. Through engine compartment Answer: a
Automobile Engineering Objective Type Interview Questions Pdf | Preparation for GATE Exams
26. Overdrive is provided in the transmission of a vehicle to
a. Reach higher road speeds
b. improved fuel consumption
c. achieve better acceleration
d. carry more load Answer: b
27. The number of gear ratios in a vehicle
a. Is more with high powered vehicle
b. Is less with high powered cars
c. Is more with diesel engine heavy vehicles
d. is more with petrol engine typical American Car Answer: a
28. In the process of gear shifting in a layshaft type of gearbox
a. An upchange say third to Top Gear requires speeding up of lay shaft
b. An up change requires slowing down the layshaft
c. An upchange or down change is not accompanied by changes in layshaft speed
d. Gear shifting involves change of speed only in down shifts Answer: b
29. A fluid coupling
a. Acts like flywheel and replaces it since as it is known also by the name fluid wheel
b. It takes the place of friction clutch and replaces it completely in synchromesh transmission systems
c. It replaces the friction clutch and the Gearbox also
d. Does the function of a clutch automatically, but cannot be used for shifting transmission to effect Gear changes Answer: d
30. The main advantage of a fluid coupling is
a. In its low torque capacity at low speeds
b. Steady state torque characteristic
c. Due to its ability to slip
d. Due to its ability to function fluid medium Answer: c
31. The hydrodynamic torque converter
a. Gives a continuous variation of torque with increase of output speed
b. Enables to get the max. h.p continuously
c. Gives a speed variation without torque variation
d. Maintains a high efficiency throughout the operating speed range Answer: a
32. An automatic transmission works on the principle of
a. Centrifugal device making up changes proportional to road speed
b. Centrifugal device connected to crankshaft making up changes prop. to engine speed
c. Makes changes depending on throttle position in conjunction with road speed governor
d. Makes gear changes at equal intervals or set road speeds Answer: c
33. The coil springs are located in between the pressure plate and the
a. Clutch cover
b. Disc assembly
c. Pressure plate baffle
d. Flywheel Answer: a
34. The clutch cover is bolted to the
a. Friction disc
b. Flywheel
c. Car frame
d. Engine block Answer: b
35. The friction disc is positioned between the flywheel and the
a. Engine
b. Crankshaft
c. Pressure plate Answer: c
36. There is a double faced friction disc splined to a shaft in the
a. Transmission
b. Differential
c. Engine
d. Clutch Answer: d
37. To prevent distortion on re-installation on the clutch cover attaching bolts should be tightened
a. One at a time
b. Evenly
c. Until springs begin to compress
d. Until springs are expanded Answer: b
38. The power train transmits power from the engine to the
a. Crank shaft
b. Rear wheels
c. Front wheels
d. Steering gear Answer: b
39. The clutch pressure plate is mounted on the
a. Flywheel
b. Clutch cover
c. Friction disc
d. Crankshaft Answer: b
40. The release levers in a typical clutch pivot on
a. Springs
b. Levers
c. Threaded levers
d. Pins Answer: d
41. If two meshing gears have 4:1 gear ratio and the smaller gear has 12 teeth, the large gear will have
a. 12 teeth
b. 24 teeth
c. 36 teeth
d. 48 teeth Answer: d
42. The two meshed gears have a gear ratio of 3:1. Every time the larger gear turns once the small gear will
be to turn
a. 1/3 time
b. one
c. three times Answer: c
43. In the diaphragm clutch inward movement of the throw out bearing causes the diaphragm spring to
a. Dish inward
b. Expand
c. Contract Answer: a
44. The fluid coupling has maximum efficiency when driving and driven members are turning at
a. High speed
b. Low speed
c. Different speed
d. About the same speed Answer: a
45. The purpose of the guide ring in the fluid coupling is to reduce oil
a. Movement between the members
b. Turbulence
c. Level in coupling Answer: b
46. Synchronizing is designed to prevent gear clash when shifting into
a. First and reverse
b. First and second
c. Second and high Answer: c
47. When shifting into low, a gear on the transmission main shaft is moved in to mesh with the
a. Counter shaft low gear
b. Counter shaft idler
c. Clutch gear
d. Output gear Answer: a
48. Clutch noises are usually most noticeable when the engine is
a. Accelerating
b. Decelerating
c. Idling
d. Being started Answer: c
49. Clashing of gears when shifting into high could result from
a. Engine misalignment
b. Drive key sheared
c. A defective Synchronizer Answer: c
50. Transmission noise in neutral could result from
a. Worn gears
b. Loose propeller shaft
c. Misadjusted gear linkage Answer: a
1. The purpose of the fluid coupling is to act as a
a. Synchronizing device
b. Automatic gear changer
c. Flexible power-transmitting coupling Answer: c
2. The distance between adjacent meshing teeth of mating gears is called
a. Clearance
b. Back lash
c. Flank Answer: b
3. In the fluid coupling, speed reduction means torque reduction. But in the torque converter, speed reduction means
a. Torque increase
b. Torque loss
c. Power increase Answer: a
4. The fluid coupling consists essentially of two
a. Doughnuts
b. Vane members
c. Guide rings
d. Driving shafts Answer: b
5. The number of planetary gear sets in a hydromatic transmission system is
a. Two
b. Three
c. Four
d. Five Answer: c
6. When coming out of overdrive, the overdrive electric control momentarily
a. De clutches the engine
b. Interrupts the ignition system action
c. De meshes the sun gear Answer: b
7. In order for power to flow through the fluid coupling from the engine to car wheels, the driving member
must be turning
a. Slower than driven member
b. At same speed as driven member
c. Faster than driven member Answer: c
8. In the overdrive, there is an arrangement whereby it is possible to lock stationary the
a. Ring gear
b. Sun gear
c. Planet pinion cage Answer: b
9. The coil spring clutch may use from
a. Two to six springs
b. Three to nine springs
c. Four to eight springs
d. Ten to twelve springs Answer: b
10. If the differential noise is present only when the car is rounding a curve the trouble would be due to
a. Heavy heel contact on gear teeth
b. Heavy toe contact on gear teeth
c. Binding in differential case Answer: c
11. To correct heavy flank contact on the ring gear teeth
a. Move the drive pinion in
b. Move the drive pinion out
c. Move the ring gear out
d. Adjust back lash as necessary Answer: c
12. The ring gear is adjusted in the differential by use of
a. Selective washers of proper thickness
b. Bearing adjuster
c. Adjusting screws Answer: a
13. The axle bevel gears in the differential mesh with the
a. Differential pinion gears
b. Ring gear
c. Drive pinion
d. Main gear Answer: a
14. The ring gear is mounted on the
a. Differential housing
b. Differential carrier
c. Differential case
d. Axle housing Answer: d
15. The outer end of the axle is supported by a
a. Spring seat
b. Sleeve bearing
c. Housing bracket
d. Ball or roller bearing Answer: d
16. When the axle is pulled the bearing
a. Stays in the housing
b. Stays in the differential
c. Comes out with it Answer: a
17. In the differential the ring gear is bolted to the
a. Differential housing
b. Differential case
c. Axle housing
d. Drive pinion Answer: b
18. The slip joint permits a change in the
a. Length of shaft
b. Speed of rotation
c. Angle of drive Answer: a
19. The centre part of a typical universal joint is called the
a. Trunnion
b. Joint
c. Bearing
d. Spider Answer: d
20. To take care of the difference in the driving angle as rear axle moves up and down, the propeller shaft has
one or more
a. Slip joint
b. Elbow joint
c. Release joint
d. Universal joints Answer: d
21. In the modern differential, the type of gearing used for the drive pinion and ring gear is
a. Spur
b. Spiral bevel
c. Hypoid Answer: c
22. The propeller shaft has one or more
a. Spur gears
b. Elbow joints
c. Universal joints
d. Fluid couplings Answer: c
23. There is a tendency for the rear axle housing to rotate in a direction opposite to the direction of the rear
wheels and this effect is due to
a. The torque tube
b. Acceleration
c. Rear end torque Answer: c
24. In the slip joint, slippage occurs between internally and externally mated
a. Couplings
b. joints
c. Splines Answer: c
25. If a noise is present in a differential only when the car moves past a curve, the chances are that the trouble
is due to some fault in
a. Drive pinion assembly
b. Differential case assembly
c. Wheel bearing Answer: b
26. In the differential to correct for heavy face contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive pinion out
c. Drive gear out and then adjust backlash Answer: a
27. In the differential, to correct for heavy flank contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive pinion out
c. Drive gear out and then adjust back lash Answer: c
28. In the differential, to correct for heavy heel contact on the drive gear teeth, it is necessary to move the
a. Drive pinion in
b. Drive gear towards pinion
c. Drive gear away from pinion and adjust back lash Answer: a
29. In the differential, to correct for heavy toe contact on the drive gear teeth, it is necessary to move the
a. Drive gear towards pinion
b. Drive pinion gear away from pinion
c. Drive pinion out and adjust back lash Answer: c
30. The drive gear in the differential is adjusted by use of
a. Selective washers of proper thickness
b. Adjustment nuts
c. Adjustment screws Answer: a
31. The type of rear axle in which the wheel end is supported by bearings inside the axle housing is
a. Semi floating axle
b. Three-quarter floating axle
c. Full-floating axle Answer: a
32. The two basic types of axle are
a. Dead and floating
b. Dead and live
c. Floating and semi floating Answer: b
33. In the differential, the ring gear is bolted to the
a. Differential housing
b. Differential case
c. Drive pinion
d. Axle shaft Answer: b
34. In the Hotchkiss drive, the rear end torque is absorbed by the
a. Torque tube
b. Rear springs
c. Radius rods Answer: b
35. The universal joint permits a change in the
a. Length of the shaft
b. Speed of rotation
c. Angle of drive Answer: c
36. To correct heavy heel contact on the ring gear teeth, move the
a. Drive pinion in
b. Ring gear towards pinion
c. Ring gear away from pinion and adjust backlash Answer: a
37. Propeller shaft includes
a. Universal joint
b. Knee joint
c. Slip joint Answer: a
38. A humming noise in the differential is often caused by improper tooth contact between the
a. Drive pinion & ring gear
b. Axle and side gear
c. Pinion and side gears Answer: a
39. Axle shaft of the three-quarter floating axle is subjected to
a. Bending stress only
b. Torsional stress only
c. Bending and torsional stress
d. Torsional stress and stress due to axial force during cornering Answer: b
40. Whirling of the propeller shafts is mainly due to
a. The transmission of torsional vibration of the crankshaft
b. The use of a sliding joint in the propeller shaft
c. The use of universal joints in the drive
d. Lack of balance and excessive length of propeller shaft Answer: d
41. In a vehicle with dual rear axle, the wheel base is measured from the
a. Axis of the front wheel to the nearest rear wheel axis
b. Axis of the front wheel to the farthest rear wheel axis
c. Rear of cab to farthest rear wheel axis
d. Axis of the front wheel to an axis midway between the axes of rear wheels Answer: c
42. The axle shaft of a semi floating rear axle is subjected to
a. Axial thrust only
b. Axial thrust and bending stress
c. Torsional stress only
d. Bending, torsional stresses and end thrust Answer: d
43. Differential mechanism at the axle is provided mainly to
a. Enable the vehicle go round corners
b. Equalize the division of torque between the two wheels c. To provide a reduction ratio
d. To turn the drive through a right angle Answer: a
44. De Dion axle is usually
a. Used at the front of heavy vehicles
b. A kind of axle in which the differential and final drive gears are supported in the frame
c. A two speed axle drive suited for heavy vehicles
d. The popular drive for 2 wheeler Answer: b
45. Spur gear type of differential is unsuitable for passenger car applications because
a. It results in a very costly rear axle assembly
b. The large transmission losses due to spur gears
c. Large dimension of final drive housing resulting in reduced ground clearance
d. Centre of gravity of the vehicle is raised Answer: d
46. Floating axles are classified on the basis of
a. The amount of torque transmitted
b. Depending upon their location whether at front or rear
c. Depending on the nature of forces like torsional vertical and lateral to which they are subjected
d. Purely on the basis of type and number of bearings used at the work Answer: c
47. Which of the following layouts is not used in motor vehicles?
a. Front engine front drive
b. Front engine rear drive
c. Rear engine front drive
d. Rear engine rear drive Answer: c
48. The most popular drive at the drive axle for the passenger car is
a. Straight bevel gear
b. Spiral bevel gear
c. Worm gear drive
d. Hypoid drive Answer: d
49. The drive line consists of the propeller shaft with
a. Drive and universal joints
b. Universal joints and slip joints Answer: b
50. In the differential the ring gear is attached to the
a. Bevel gear
b. Drive gear
c. Differential case
d. Propeller shaft Answer: c
26. In trucks the system of wheel braking employed is
(a) Mechanical
(b) Hydraulic
(c) Pneumatic Answer: c
27. In jeeps we use
(a) Mechanical brakes
(b) Hydraulic brakes
(c) Air brakes Answer: b
28. In a vacuum type servo-assisted brake system, vacuum is available in …….. is made use of
(a) Exhaust manifold
(b) Combustion chamber
(c) Water jackets
(d) Inlet manifold Answer: d
29. The approximate ratio of effort applied : effort available from servo system is (a) 1:1
(b) 3:1
(c) 1:4
(d) 10:1 Answer: b
30. Due to continuous running on a hot day the temperature of the braking fluid will increase, hence some
braking torque is applied on brake shoes, to avoid this a small quantity of fluid will be allowed to escape
into the master cylinder through
(a) Intake port
(b) Exhaust port
(c) Secondary port Answer: c
31. As the load on the vehicle increase it demands
(a) Increased braking torque
(b) Decreased braking torque
(c) Same braking torque Answer: a
32. In the hydraulic brake system, the movement of a piston in the master cylinder produces hydraulic
pressure which causes movement of
(a) Brake shoe
(b) Brake pedal
(c) Brake cam Answer: a
33. In the case of brake linings saturants and bonding materials are used to
(a) Facilitate moulding and curing of brake linings
(b) To improve the heat dissipating capacity of linings
(c) To give a constant coefficient of friction up to 800 C
(d) To make the lining material impervious to moisture and oil and to ensure a steady coefficient of friction up to 3000 C Answer: a
34. Brake lining area required for shoe brakes for trucks is mainly based on
(a) Average truck speed
(b) Frequency of brake applications
(c) Gross vehicle weight
(d) Material used for brake drums Answer: c
35. The working fluid normally used in hydraulic brake systems is
(a) High speed diesel oil along with alcohol
(b) SAE 20 oil with anti-corrosion additives
(c) A mixture of vegetable oil and SAE 10 oil
(d) A solution of castor oil in alcohol along with neutralizer Answer: d
36. Movement of the brake pedal forces brake fluid from the master brake cylinder through brake lines and into the
(a) Brake shoes
(b) Wheel cylinders
(c) Brakes cables
(d) Pedal rod Answer: b
37. During braking the brake shoe is moved outward to press against the
(a) Wheel piston or cylinder
(b) Brake lining
(c) Brake drum or disc
(d) Wheel rim or axle Answer: c
38. In the hydraulic brake system, movement of a piston in the master cylinder produces hydraulic pressure which causes movement of the
(a) Wheel cylinder pistons
(b) Brake pedal
(c) Brake cam Answer: a
39. The radius of a pneumatic tyre is
(a) The radius of unloaded fully inflated tyre
(b) The height of centre of tyre from the ground when it is loaded
(c) Imaginary radius found by measuring the distance per revolution of the loaded tyre
(d) It is fixed radius, based on the dimensions of the tyre Answer: a
40. For a through inspection a tyre should be
(a) On the car
(b) On the wheel
(c) Off the wheel
(d) Inflated Answer: d
41. If a tube of large size than required is installed in a tyre then
(a) The tyre will over expand
(b) The tyre and tube will not fit the rim
(c) The tube will overlap and wear Answer: c
42. Of the four tyres on a car, the one that wears most is the
(a) Right front tyre
(b) Right rear tyre
(c) Left front tyre
(d) Left rear tyre Answer: b
43. To equalize tyre wear, it is suggested that tyres be rotated from one wheel to another every
(a) 80 kms
(b) 8000 kms
(c) 800 kms Answer: b
44. The distance between dual tyres of vehicles is to be correctly spaced to
(a) Ensure proper distribution of load between dual wheels
(b) Reduce over-steering effect
(c) Reduce the slippage between tyre and road while taking a turn
(d) Ensure effective braking Answer: c
45. When an automobile takes a tum to avoid the skidding and over turning
(a) Each wheel will roll independently
(b) Front two wheels will have a common centre during a turning
(c) All the 4 wheels will roll on arcs having a common centre Answer: b
46. Wheels must be balanced
(a) On the car only
(b) Either on or off the car
(c) Off the car only Answer: c
47. Weight can be attached to wheel rim to correct
(a) Wheel alignment
(b) Wheel run out
(c) Wheel balance Answer: c
48. Toe out on turns
(a) Is adjusted by shims
(b) Is adjusted by changing the effective length of the tie rods
(c) Cannot be adjusted Answer: c
49. Caster is defined as the inclination of
(a) Front wheel to the vertical
(b) The king pin axis in the fore and aft plane
(c) The king pin axis in the transverse vertical plane
(d) The axis of stub axle to the horizontal Answer: b
50. The Ackermann steering layout
(a) Makes for safer driving
(b) Enables the driver to feel ahead position
(c) Gives minimum tyre wear
(d) Reduces load on the kingpins and stub axle Answer: a
