250+ TOP MCQs on Types, Engine and Component – 2 and Answers

Steam and Gas Turbines Multiple Choice Questions on “Types, Engine and Component – 2”.

1. How many burners are placed in can-annular combustors in gas turbines?
a) 1
b) 3
c) 5
d) Not specific one or more

Answer: d
Clarification: Multiple or single burners are evenly spaced in the combustor.

2. Silo combustors are mounted Internal to gas turbine body.
a) True
b) False

Answer: b
Clarification: Silo combustors are mounted external to the gas turbines.

3. Axial flow turbines are used in ________
a) industrial gas turbines
b) air crafts
c) hybrid vehicles
d) none of the mentioned

Answer: a
Clarification: Axial flow gas turbines are mostly used for industrial purposes.

4. What completes a stage in Turbine expansion?
a) One cycle passing through compressor
b) Row of moving blades followed by a row of stationary blades
c) Stationary blades row followed by Moving blades row
d) None of the mentioned

Answer: c
Clarification: Turbine expansion takes place in stages. One stage comprises of a Row of stationary blades followed by a row of moving blades.

5. What does TRIT in a gas turbine stand for?
a) Turbine Rotor Inlet Temperature
b) Total Raise at Inlet Temperature
c) Temperature Raise In Turbine
d) None of the mentioned

Answer: a
Clarification: TRIT stands for Turbine Rotor Inlet Temperature and TIT stands for Turbine Inlet Temperature.

6. When at idle conditions Gas Turbine Engines use more fuel when compared to Reciprocating engines.
a) True
b) False

Answer: a
Clarification: Though the conditions may be idle but to run the turbine compressor to work, compressor takes as much as the two thirds of the total power produced from combustion and remaining one third is used for power output. So during Idle conditions power output may not be required but compressor uses its 2/3 of energy, whereas reciprocating engines doesn’t require any compressors equipped separately and hence less fuel will be burnt during idle time when compared to Gas turbines.

7. In Gas Turbines Compressors raise the pressure of air by _______ times.
a) 25
b) 15
c) 30
d) 10

Answer: c
Clarification: Compressor work is to raise the pressure of the air at constant volume. In gas turbines, it raises by a factor of 30.

8. In Gas Turbines, Turbine is used to convert _________
a) Kinetic energy to Rotational energy
b) Potential energy of the gases to Rotational energy
c) Heat energy of the gases to Rotational energy
d) None of the mentioned

Answer: a
Clarification: Highly pressurized gas from compressor burns the fuel injected into combustor and those hot gases released move with high velocity towards turbine which rotates the turbine.

9. Hallow perforated piece of heavy metal inside the combustor is called as _________
a) Fuel injector
b) Frame holder
c) Burner
d) None of the mentioned

Answer: b
Clarification: As gas with high pressure enters the combustor with high velocities, for continuous combustion, the combustor in such situations require the frame to be held and therefore frame holder is used.

10. Turbine and Output shaft rotate freely without any connection to the engine.
a) True
b) False

Answer: a
Clarification: Turbine and output shaft are completely stand alone in gas turbine.