# 251-300 TOP MOST Automobile Engineering Interview Questions and Answers | Preparation for GATE Exams

## Automobile Engineering Interview Questions and Answers | Preparation for GATE Exams:-

1. In a differential with a gear ratio of 4 : 1 the drive pinion would revolve four times to cause the ring gear to rotate
(a) 1 time
(b) 2 times
(c) 4 times
(d) 6 times
Ans: a

2. More often, the condition that draws attention to trouble in the differential is
(a) Rough operation
(b) Noise
(c) Power loss
Ans: a

3. To correct heavy toe contact on ring gear teeth, move the
(a) Ring gear towards pinion
(b) Ring gear away from pinion
(c) Drive pinion out and back lash
Ans: c
4. On a straight road, the ring gear
(a) Rotates at the same speed as wheels
(b) Rotates faster than wheels
(c) Rotates slower than wheels
(d) Does not rotate
Ans: a

5. In a passenger car a typical arrangement of braking with drum brakes will be
(a) Two leading shoes at front and leading & trailing at rear
(b) All the wheels having leading and trailing shoes
(c) All the wheels having two leading shoes
Ans: b

6. Brake efficiency is a term which denotes
(a) Efficiency of the braking system as a whole
(b) Efficiency of the braking linings
(c) The deceleration as percentage of gravity
(d) Efficiency of the operating linkage
Ans: c

7. The most widely used brakes are operated
(a) Electrically
(b) Hydraulically
(c) By air pressure
(d) By vacuum
Ans: b

8. 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) Smaller in diameter
(c) Larger in diameter
Ans: c

9. The type of braking system referred to as power brake, makes use of
(a) Electromagnets
(b) Compressed air
(c) Vacuum
Ans: b

10. In the vacuum suspended system, the brakes are applied when
(a) Atmospheric pressure is applied to one side of the diaphragm
(b) Vacuum is applied to both sides of diaphragm
(c) Atmospheric pressure is applied to both sides of the diaphragm
Ans: a

11. In the atmospheric suspended system the brakes are applied when
(a) Vacuum is applied to both sides of the diaphragm
(b) Atmospheric pressure is applied to both sides of the diaphragm
(c) Atmospheric pressure is applied to one side of the diaphragm
Ans: a

12. In a vacuum suspended unit, when the brakes are on, the piston or diaphragm has on both sides of it
(a) Atmospheric pressure
(b) Vacuum
(c) Hydraulic pressure
Ans: a

13. The function of the relay valve in a compressed air brake system is to
(a) Limit the maximum pressure reached in brake chambers
(b) Relieve air pressure in brake chambers when it reaches a maximum value
(c) Reduce the effort required at the brake pedal
(d) Speed up the supply of air to brake chambers located at a distance from brake valve
Ans: a

14. In the hydraulic braking system, the piston in the master cylinder is connected by mechanical linkage to the
(a) Wheel cylinders
(b) Brake shoes
(c) Brake pedal
(d) Wheel pedal
Ans: c

15. In the hydraulic braking system, the movement of the pistons in the wheel cylinder is transmitted to the
brake shoes by
(a) Actuating pins
(b) Springs
(c) Cables
(d) Trunnion
(e) Joints
Ans: a

16. Two general types of vacuum assisted power brakes are (a) Vacuum suspended and power suspended
(b) Integral and pressure suspended
(c) Atmospheric suspended and vacuum suspended
Ans: c

17. In the integral type of power brake, the diaphragm acts directly on the hydraulic piston in the
(a) Master cylinder
(b) Wheel cylinder
(c) Multiplier unit
Ans: a

18. In the multiplier type of brake, the diaphragm acts directly on the hydraulic piston in the
(a) Master cylinder
(b) Wheel cylinder
(c) Multiplier unit
Ans: c

19. In the power assisted type of brake the bellows applies force to the master cylinder piston
(b) Directly
Ans: c

20. In the air brake, air pressure is supplied by
(a) Engine manifold
(b) A compressor
(c) The diaphragm valve
Ans: b

21. Power brakes in general operate making use of the pressure differential between the vacuum from the
intake manifold and
(a) Compressed air
(b) Atmospheric pressure
(c) Venturi vacuum
Ans: b

22. In the multiplier power brake system, movement of the brake pedal
(a) Increases the hydraulic pressure which actuates the control valve
(b) Actuates the valve in the bellows through linkage
(c) Actuates the valve to admit atmospheric pressure to one side of the diaphragm
Ans: c

23. In the power assisted brake system, movement of the brake pedal
(a) Increases the hydraulic pressure which actuates the control valve
(b) Actuates the valve in the bellows through linkage
(c) Actuates the valve to admit atmospheric pressure to one side of the diaphragm
Ans: c

24. The metal used for the brake drum is
(a) Aluminium alloy
(b) Cast steel
(c) Pressed steel
(d) Cast iron
Ans: d

25. Bleeding of brakes means
(a) Filling the master cylinder with brake oil
(c) Removing air between master cylinder and each wheel unit
Ans: c

### Automobile Engineering Interview Questions and Answers Preparation for GATE Exams

26. In trucks the system of wheel braking employed is
(a) Mechanical
(b) Hydraulic
(c) Pneumatic
Ans: c

27. In jeeps we use
(a) Mechanical brakes
(b) Hydraulic brakes
(c) Air brakes
Ans: 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
Ans: 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
Ans: 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
Ans: c

31. As the load on the vehicle increase it demands
(a) Increased braking torque
(b) Decreased braking torque
(c) Same braking torque
Ans: 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
Ans: 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
Ans: 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
Ans: 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
Ans: 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
Ans: 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
Ans: 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
Ans: a

39. The radius of a pneumatic tyre is
(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
Ans: a

40. For a through inspection a tyre should be
(a) On the car
(b) On the wheel
(c) Off the wheel
(d) Inflated
Ans: 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
Ans: 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
Ans: 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
Ans: 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
Ans: 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
Ans: b

46. Wheels must be balanced
(a) On the car only
(b) Either on or off the car
(c) Off the car only
Ans: c

47. Weight can be attached to wheel rim to correct
(a) Wheel alignment
(b) Wheel run out
(c) Wheel balance
Ans: c

48. Toe out on turns
(b) Is adjusted by changing the effective length of the tie rods
Ans: 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
Ans: 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
Ans: a