250+ TOP MCQs on Gas Turbine-Steam Power Plant – II and Answers

Power Plant Interview Questions and Answers for freshers on “Gas Turbine-Steam Power Plant – II”.

1. The heating value of gaseous fuels is about _____________
a) 500 kJ/litre
b) 30 kJ/litre
c) 100 kJ/litre
d) 10 kJ/litre
Answer: b
Clarification: 30 kJ/litre is the heating value of gaseous fuels.

2. The compressor has to be started _____________
a) Before starting the gas turbine
b) After starting the gas turbine
c) Simultaneously with starting of gas turbine
d) At any time during the operation
Answer: a
Clarification: Compressor has to be started before starting the gas turbine as the turbine work is used by compressor.

3. Which of these is not a part of a Gas Turbine Plant?
a) Compressor
b) Gas Turbine
c) Combustion chamber
d) Boiler
Answer: d
Clarification: A Gas Turbine Plant has the following parts:
Compressor, Gas Turbine, Combustion chamber.

4. What are the major field(s) of application of gas turbine?
a) Aviation
b) Oil and gas industry
c) Marine propulsion
d) All of the mentioned
Answer: d
Clarification: A Gas Turbine has applications in nearly all fields, the major ones being in the fields of Aviation, Oil & Gas industry, Marine propulsion.

5. Which of the following is (are) the limitation(s) of gas turbines?
a) They are not self-starting
b) Higher rotor speeds
c) Low efficiencies at part loads
d) All of the mentioned
Answer: d
Clarification: The limitations in the functioning of a Gas Turbines are inability of self-starting, excess rotor speeds and inability to adjust to varying loads.

6. The ratio of heat actually released by 1kg of fuel to heat that would be released by complete perfect combustion is called ___________
a) Thermal efficiency
b) Combustion efficiency
c) Engine efficiency
d) Compression efficiency
Answer: b
Clarification: Combustion efficiency is defined as,” The ratio of heat actually released by 1kg of fuel to heat that would be released by complete perfect combustion”.

7. What is the percentage of total energy input appearing as network output of the cycle?
a) Thermal efficiency
b) Combustion efficiency
c) Engine efficiency
d) Compression efficiency
Answer: a
Clarification: Thermal Efficiency is, “The percentage of total energy input appearing as network output of the cycle”.

8. Which of the following method(s) can be used to improve the thermal efficiency of open cycle gas turbine plant?
a) Inter-cooling
b) Reheating
c) Regeneration
d) All of the mentioned
Answer: d
Clarification: The various methods to improve the efficiency of open cycles include intercooling the feed water from the compressor to the turbine and then employing regeneration & reheat to just use the power of the reheated water in order to maximize the power output.

9. Which of the following is (are) used as starter for a gas turbine?
a) An Internal combustion engine
b) A steam turbine
c) An auxiliary electric motor
d) All of the mentioned
Answer: d
Clarification: There are various methods by which a Gas Turbine can be started, they are by the use of an Internal Combustion engine, a steam turbine, an auxiliary electric motor, etc.

10. Gas turbine is shut down by ____________
a) Turning off starter
b) Stopping the compressor
c) Fuel is cut off from the combustor
d) All of the mentioned
Answer: c
Clarification: The only way to stop a running Gas turbine is by cutting off the fuel supply so that the various processes in the cycle are stopped.