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

Power Plant Engineering Multiple Choice Questions on “Gas Turbine-Steam Power Plant – I”.

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1. What is the air standard cycle for a Gas-Turbine called?
a) Reheat cycle
b) Rankine cycle
c) Brayton cycle
d) Diesel cycle
Answer: c
Clarification: Brayton cycle is an ideal air standard cycle for a Gas turbine, which, like the Rankine cycle, also comprises of two reversible adiabatic & two reversible isobars.

2. What is the difference between a Rankine cycle & a Brayton cycle?
a) working fluid in a Brayton cycle undergoes phase change while it doesn’t in Rankine cycle
b) working fluid in a Brayton cycle doesn’t undergo phase change while it does in Rankine cycle
c) both are same
d) none of the mentioned
Answer: b
Clarification: The difference between a Rankine cycle & a Brayton cycle is that the working fluid in a Brayton cycle doesn’t undergo phase change while it does in Rankine cycle.

3. Which of the following is a type of Gas Turbine Plant?
a) Single Acting
b) Double Acting
c) Open
d) None of the mentioned
Answer: c
Clarification: Open & Closed Gas Turbine plants are the two types.

4. Power is produced when the working fluid does some work on the?
a) Shaft
b) Fins
c) Blades
d) None of the mentioned
Answer: c
Clarification: For the production of power, the working fluid does some work on the blades of the turbine, thereby producing Power.

5. A Gas Turbine is which type of combustion plant?
a) external
b) open
c) internal
d) cannot say
Answer: c
Clarification: Since for the production of power, the working fluid does some work on the blades of the turbine, thereby producing Power. Hence, it is called an internal combustion plant.

6. Which among these is the main component of a gas turbine plant?
a) Condenser
b) Compressor
c) Boiler
d) Both Compressor & Boiler
Answer: b
Clarification: The main component of a Gas turbine plant is Compressor.

7. Which type of compressor is used in a gas turbine plant?
a) Reciprocating compressor
b) Screw compressor
c) Multistage axial flow compressor
d) Either Reciprocating compressor & Screw compressor
Answer: c
Clarification: Multistage axial flow compressor is the compressor in practical usage in a gas turbine plant.

8. What part or % of power developed is utilised for driving the compressor?
a) 65 %
b) 70 %
c) 55 %
d) 80 %
Answer: a
Clarification: A total of 65 % of power developed in the gas turbine is used for driving the compressor.

9. The gas turbine power plant mainly uses which among the following fuels?
a) Coal and Peat
b) Kerosene oil and diesel oil and residual oil
c) Gas oil
d) Natural gas and liquid petroleum fuel
Answer: d
Clarification: Natural gas and liquid petroleum fuel are among the two fuels used in a gas turbine.