250+ TOP MCQs on Control and Performance and Answers

Steam and Gas Turbines Multiple Choice Questions on “Control and Perfomance”.

1. Gas turbine controls are classified into ____ types.
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: Gas turbine drives are classified into two types.

2. DSC interface is used in __________
a) compressor drive
b) turbine drive
c) compressor & turbine drive
d) none of the mentioned
Answer: c
Clarification: Both DSC interface and Graphic interface is used in both compressor drive and turbine drive.

3. In gas turbines Load control is available in _______
a) compressor drives
b) generator drives
c) compressor & generator drive
d) none of the mentioned
Answer: b
Clarification: Load control is available in generator drives as load can be applied or decreased only on the generator not on the compressor.

4. Communication interfaces are ___________ in steam drives.
a) available
b) not available
c) depends on the usage
d) none
Answer: a
Clarification: Communication interface is available in steam drives.

5. Steam turbine performance is expressed in _______
a) heat rate
b) steam rate
c) heat & steam rate
d) none of the mentioned
Answer: b
Clarification: Steam turbine performance is expressed in steam rate.

6. Gas turbine performance is expressed in terms of _______
a) heat & steam rate
b) steam rate
c) heat rate
d) none of the mentioned
Answer: c
Clarification: Gas turbine performance is expressed in terms of heat rate while steam turbine is expressed in terms of steam rate.

7. Gas turbine performance is directly proportional to the ______
a) inlet air density
b) inlet air temperature
c) inlet air density & inlet air temperature
d) none of the mentioned
Answer: a
Clarification: Gas turbine performance is directly proportional to inlet air density as inlet air density increases its inlet air mass which increases the performance of gas turbine.

8. In a gas turbine power produced is _________ to inlet air density.
a) indirectly proportional
b) directly proportional
c) not proportional
d) one
Answer: b
Clarification: As inlet air density is directly related to the performance of gas turbine, When inlet air density is increased its performance increased which means the power produced by gas turbine is increased.

9. In a gas turbine when firing temperature is __________ engine efficiency changes.
a) increased
b) decreased
c) remained constant
d) none of the mentioned
Answer: a
Clarification: When firing temperature is increased its environmental air conditions are altered so that its engine efficiency changes.

10. In steam turbines vapor and vapor conditions change with time.
a) True
b) False
Answer: a
Clarification: In steam turbine both vapor and vapor conditions are constant and that’s what makes calculating the steam turbine performance easy where as in gas turbines both vapor and vapor conditions are not constant and that makes it difficult for calculating performance.