Category: Steam and Gas Turbines Objective Questions

Steam and Gas Turbines Multiple Choice Questions on “Losses in Reaction Blade Passages”.

1. Passages in steam turbines are _______
a) convergent
b) divergent
c) convergent & divergent
d) none of the mentioned
Answer: a
Clarification: Passages in steam turbines are convergent so that steam expands.

2. The flow of steam through the nozzle is isoentropic.
a) True
b) False
Answer: b
Clarification: The flow of steam is not isoentropic.

3. In reaction turbines a pressure drop occurs between rotors and stator.
a) True
b) False
Answer: a
Clarification: Steam when leaving the stator changes its speed relative to the blade speed and pressure drop occurs.

4. Steam is directed towards rotor by _________
a) rotor vanes
b) moving blades
c) fixed blades
d) none of the mentioned
Answer: c
Clarification: Steam is directed by fixed vanes in steam turbine.

5. Losses that occur when steam is supplied from boiler to turbine is called as ___________
a) regulating loss
b) friction loss
c) gland loss
d) none of the mentioned
Answer: a
Clarification: When steam is supplied from boiler to turbine it passes through regulating valve and some energy loss is occurred while passing through regulating valve which is called as regulating loss.

6. Losses occurred while passing through blades are called as ________
a) efficient losses
b) blade friction loss
c) efficient & blade friction losses
d) none of the mentioned
Answer: b
Clarification: Blade friction loss are caused due to friction between blade and steam and loss occurs due to that friction.

7. Disc friction loss is due to ___________
a) churning action of disc
b) friction between blade and steam
c) pressure drop
d) none of the mentioned
Answer: a
Clarification: Blades re connected to the disc and there will be some amount of energy loss due to churning action of the disc.

8. For fixing blades and rotating components together ___________ are used.
a) bolt and nut
b) valve
c) glands
d) none of the mentioned
Answer: c
Clarification: Glands are used to fix blades and rotating components together.

9. Losses occurred at gap between glands are called as _________
a) valve losses
b) gland losses
c) valve & gland losses
d) none
Answer: b
Clarification: Gland losses are the losses that are occurred at the gap between the glands.

10. Kinetic energy that steam has while coming out of turbines is called as ________
a) residual loss
b) friction loss
c) gland loss
d) none of the mentioned
Answer: a
Clarification: Residual losses are the energy that steam contains while exiting the turbine. This energy cannot be used and hence it is called as residual losses.

Steam and Gas Turbines Multiple Choice Questions on “AIEE-ASME Preferred Standard Turbine”.

1. AIEE ASME preferred turbines don’t have any side condensers.
a) True
b) False
Answer: b
Clarification: AIEE ASME preferred turbine have side condensers mounted.

2. Usage of condensers mounted on sides reduces the ___________
a) Power supply
b) Support structures
c) Temperature
d) None of the mentioned
Answer: b
Clarification: Usage of condensers mounted on sides reduces the height of the turbine and support structures can be reduced.

3. AIEE ASME preferred standard power plant is first operated in Greens Bayou electric power plant.
a) True
b) False
Answer: a
Clarification: AIEE ASME preferred standard power plant was first operated in greens bayou electric power plant.

4. The capacity of first AIEE ASME preferred standard turbine is _______
a) 105MW
b) 55MW
c) 66MW
d) 77MW
Answer: c
Clarification: The capacity of AIEE ASME preferred standard turbine generator which first came into use is 66MW.

5. AIEE-ASME preferred standard turbine was presented in _______ ratings when first came into outdoor use.
a) 2
b) 8
c) 3
d) 6
Answer: b
Clarification: AIEE-ASME preferred standard turbine was presented in 8 ratings when it first came into existence. They are 12.65 MW, 16.5 MW, 22 MW, 33 MW, 44 MW, 66 MW, 100 MW, 150 MW.

6. Gantry rolling over the turbine deck ________ on AIEE-ASME preferred standard turbine.
a) done
b) not done
c) depends on the use
d) none of the mentioned
Answer: a
Clarification: Gantry rolling over the turbine deck can be done on AIEE-ASME preferred standard turbine.

7. Outdoor lagging of the turbine generator _________ the effectiveness of the time.
a) reduces
b) increases
c) depends on the load
d) none of the mentioned
Answer: b
Clarification: Outdoor lagging of the turbine generator increases the effectiveness of the time.

8. The outdoor lagging for AIEE-ASME preferred standard turbine is designed for ________
a) 70 P/Sq.ft
b) 80 P/Sq.ft
c) 90 P/Sq.ft
d) 85 P/Sq.ft
Answer: a
Clarification: Outdoor lagging of AIEE-ASME preferred standard turbine is designed for 70 P/Sq.ft.

9. Green Bayou Turbine generator rotates at __________
a) 4000rpm
b) 3000 rpm
c) 3600 rpm
d) 3100 rpm
Answer: c
Clarification: Green Bayou turbine generator works at 3600 rpm.

10. Power factor of Green bayou turbine generator is ______
a) 85
b) 95
c) 60
d) 70
Answer: a
Clarification: Green bayou has a power factor of 85.

Steam and Gas Turbines Multiple Choice Questions on “Fuel Injection, Atomization and Combustion Chamber”.

1. Nozzles are also a part of gas turbine _________
a) combustor
b) compressor
c) fuel injection
d) none of the mentioned
Answer: c
Clarification: In gas turbine fuel injection nozzles are used for atomization.

2. ___________ are present in gas turbine fuel injectors.
a) Vaporizers
b) Recuperators
c) Nozzles
d) None of the mentioned
Answer: a
Clarification: Vaporizers are also a part of fuel injectors.

3. ____________ are also a part of gas turbine fuel injectors.
a) Swirlers
b) Nozzles
c) Recuperators
d) None of the mentioned
Answer: b
Clarification: Swirlers present in gas turbine fuel injectors turns the movement of gas inside the injector to swirling motion so that combustion efficiency is high. Nozzles are used to inject fuel.

4. Afterburner spray bars are present in gas turbine fuel injectors.
a) True
b) False
Answer: a
Clarification: Afterburner spray bars are present in fuel injectors.

5. When fuel injectors efficiency is optimized then overall efficiency of gas turbines is __________
a) remains constant
b) decreased
c) increased
d) none of the mentioned
Answer: c
Clarification: When fuel injectors efficiency is optimized then overall efficiency of gas turbines is increased.

6. __________ of engines are determined from fuel injectors.
a) Efficiency
b) Emissions
c) Efficiency & Emissions
d) None of the mentioned
Answer: c
Clarification: Fuel injectors also plays a major role in defining emissions. Working of fuel injectors determines both emissions and efficiency.

7. Lean mixtures give _________ efficiency.
a) optimal
b) higher
c) lower
d) none of the mentioned
Answer: a
Clarification: Lean mixture give optimal efficiency.

8. In low fuel combustion lean mixture have _______ efficiency.
a) high
b) low
c) medium
d) none of the mentioned
Answer: b
Clarification: In low fuel combustion lean mixture have low efficiency.

9. Fuel droplet size effects the _________
a) combustion
b) effects
c) combustion & effects
d) none of the mentioned
Answer: a
Clarification: When fuel droplet size is minimized combustion is maximized. Combustion directly effects the efficiency of the gas turbine.

10. Airflow controls the rate of combustion.
a) True
b) False
Answer: a
Clarification: Airflow determines the mixture of fuel which controls the rate of combustion.

Steam and Gas Turbines Multiple Choice Questions on “Fuel Systems in Gas Turbines”.

1. ________ produced can be varied by varying fuel flow.
a) Exhaust gases
b) Thrust
c) Exhaust gases & Thrust
d) None of the mentioned
Answer: c
Clarification: Thrust produced can be varied by varying fuel flow. If more amount of fuel is made to flow inside more mount of energy is produced and more amount of exhaust gases are released.

2. Thrust produced also depends upon rotor _________
a) blade surface
b) blade pitch
c) blade angle
d) none of the mentioned
Answer: b
Clarification: In helicopters thrust produced is varied by varying rotor blade pitch. If the pitch of the rotor blade is increased more thrust is produced.

3. Extra fuel supply causes compressor to _______
a) stall
b) surge
c) surge & stall
d) none of the mentioned
Answer: a
Clarification: When extra fuel is supplied limiting temperature is crossed and causes compressor stall. Compressor stall is disruption of the air flow in the compressor.

4. _______ is caused when extra fuel is supplied.
a) Surge
b) Stall
c) Surge & Stall
d) None of the mentioned
Answer: c
Clarification: Surge is caused when extra fuel is supplied. Stall is also caused when extra fuel is supplied. Surge is operational limit of compressor at which minimum limits are reached.

5. When fuel flow is _______ it causes surge.
a) fuel flow is not related to surge
b) decreased
c) increased
d) none of the mentioned
Answer: c
Clarification: When fuel flow is increased it causes surge. Surge is the operational limit of compressor at which minimum levels are reached.

6. Fuel control is present in turbofan engines.
a) True
b) False
Answer: a
Clarification: Fuel control is present in turbofan engines.

7. _______ control is present in turbojets.
a) Fuel
b) Thrust
c) Fuel & Thrust
d) None of the mentioned
Answer: d
Clarification: Fuel control is present in turbojets. If the fuel is controlled it indirectly controls the thrust produced.

8. Turboprops have ________ control unit.
a) thrust
b) fuel
c) surge
d) none of the mentioned
Answer: b
Clarification: Fuel control unit is present in turboprop. By using fuel control unit amount of thrust produced can be regulated.

9. _________ control unit is present in turboshaft engines.
a) exhaust
b) fuel
c) thrust
d) none of the mentioned
Answer:b
Clarification: Fuel control unit is present in turboshaft engines. Thrust is varied by using fuel control unit in turboshaft engines.

10. Variable displacement pump is present in fuel control units.
a) True
b) False
Answer: a
Clarification: Variable displacement pumps have variable displacements which was used to meet the fuel requirements.

Automobile Engineering Multiple Choice Questions on “Steering System”.

1. The front axle of a car has pivot centers 1.3 m apart. The angle of inside lock is 40℃ and the angle of the outside lock is 35℃. What is the wheelbase of the car?
a) 5.5 m
b) 3.5 m
c) 4.5 m
d) 6.5
Answer: a
Clarification: For correct steering, cot α – cot θ = c / b where c = pivot center, b = wheelbase, α = angle of outside lock, and θ = angle of inside lock. Cot α – Cot θ = c / b ⇒ Cot 35 – Cot 40 = 1.3 / b ⇒ b = 5.49 m.

2. If the wheelbase, the pivot center, and wheel track of the are 2.5 m, 1.1 m, and 1.3 m respectively. The angle of the inside lock is 42℃. What is the circle radius of the outer front wheel?
a) 2.6 m
b) 3.6 m
c) 4.6 m
d) 1.6 m
Answer: b
Clarification: b = wheelbase = 2.5 m, c = pivot center = 1.1 m, a = wheel track = 1.3 m, and θ = angle of inside lock = 42℃. For the inner front wheel, radius =(frac{b}{sin⁡theta} – frac{a – c}{2} = frac{2.5}{sin⁡42} – frac{1.3 – 1.1}{2}) = 3.6 m

3. What is the angle between the steering axis and the vertical in the plane of the wheel?
a) Castor
b) Camber
c) Steering axis inclination
d) Kingpin inclination
Answer: a
Clarification: Castor is the angle between the steering axis and the vertical in the plane of the wheel. Positive castor improves the straight-line stability of the car.

4. If the front of the front wheels is inside and rear of front wheels are apart when the vehicle is at rest, then the configuration is called?
a) Toe-in
b) Toe out
c) Positive camber
d) Positive castor
Answer: a
Clarification: Toe-in is the amount by which the front wheels are set closer together at the front than at the rear when the vehicle is stationary. Toe-in provided generally less than 3 mm.

5. What is the name of the angle through which the wheel has to turn to sustain the side force?
a) Slip angle
b) Castor angle
c) Camber
d) Kingpin inclination
Answer: a
Clarification: The slip angle is the angle through which the wheel has to be turned to sustain the side force on the wheel. The force produced due to this which counters the side thrust is known as cornering force.

6. What is called the cornering force over the slip angle?
a) Castor trail
b) Cornering power
c) Self-righting torque
d) Pneumatic trail
Answer: b
Clarification: The ratio of cornering force to the slip angle is called the cornering power. The cornering power increases due to tire stiffness.

7. What is a condition called when the vehicle will try to move away from its normal direction and to keep it on the right path there is need to steer a little?
a) Understeer
b) Oversteer
c) Reversibility
d) Irreversibility
Answer: a
Clarification: When the slip angles of the front wheels are greater than those for the rear wheels, the radius of the turn is increased. Due to which there is the need to steer more than required which is called understeer.

8. What is the purpose of the reciprocating ball type steering gear?
a) To reduce the operating cost
b) To reduce the number of parts
c) To reduce the operating friction
d) To reduce the toe-out during the turns
Answer: c
Clarification: The reciprocating ball type steering gear serve the purpose of reducing the friction and wear of the gear.

9. What is the angle between the vertical when the top of the wheel slants outward?
a) Negative camber
b) Negative castor
c) Positive camber
d) Positive castor
Answer: c
Clarification: The angle between the vertical when the top of the wheel slants outward is called positive camber. Positive camber will lead to decrease in turning radius and thus lead to a decrease in the steering effort.

10. The furniture rollers are provided with negative castor.
a) True
b) False
Answer: b
Clarification: The furniture rollers are provided with positive castor. The positive castor gives more directional stability. In positive castor, steering axis would meet the ground ahead of the center of the roller. The later wheel would always follow the former wheel.

Steam and Gas Turbines Multiple Choice Questions on “Effect of Pressure and Temperature”.

1. When boiler pressure is increased efficiency is ____________
a) decreased
b) increased
c) remains constant
d) none of the mentioned

Answer: b
Clarification: When boiler pressure is increased efficiency is increased.

2. Why is operating pressure of boiler designed?
a) To maintain economic equivalence
b) For not decreasing efficiency
c) No such operating pressures are designed
d) None of the mentioned

Answer: a
Clarification: If boiler pressure is increased efficiency also increases. But if we keep on increasing boiler pressure to increase efficiency, Boilers that work under high pressure as costly and so boiler operating pressures are designed so that for a particular boiler it does not work beyond that pressure and it maintains economical equivalence.

3. When boiler pressure is increased __________
a) efficiency is increased
b) Qh is increased
c) efficiency & Qh is increased
d) none of the mentioned

Answer: c
Clarification: When boiler pressure is increased Qh increases as a result efficiency is increased.

4. Can we keep on increasing the pressure of the boiler to increase its efficiency?
a) Yes
b) No

Answer: b
Clarification: Boilers that work under high pressure are much more costly.

5. What happens to the efficiency when temperature is increased in rankine cycle?
a) Increased
b) Decreased
c) Remains constant
d) None of the mentioned

Answer: a
Clarification: When the temperature is increased reheating capacity of the steam increases and thus efficiency also increases.

6. Increase in temperature increases __________
a) reheating capacity of the fluid
b) thermal efficiency
c) reheating capacity of the fluid & thermal efficiency
d) none of the mentioned

Answer: c
Clarification: When reheating capacity is increased it automatically increases the thermal efficiency.

7. When condenser pressure is lowered efficiency _________
a) increases
b) decreases
c) does not effect
d) none of the mentioned

Answer: a
Clarification: When operating pressure of condenser is lowered, Heat rejecting temperature also lowers which eventually increases the efficiency.

8. Superheating the steam increases efficiency.
a) True
b) False

Answer: a
Clarification: Average Temperature of steam can be increased without increasing the pressure by superheating.

9. Superheating the steam results in __________
a) increasing the efficiency
b) decreases the moisture content
c) increasing efficiency & decreases the moisture content
d) none of the mentioned

Answer: c
Clarification: Superheating the steam increases the steam temperature and also decreases the moisture content in the steam.

10. When boiler pressure is increased __________
a) temperature also increased
b) efficiency also increases
c) temperature & efficiency increases
d) none of the mentioned

Answer: a
Clarification: When boiler pressure is increased steam temperature increases which increases efficiency.