Steam and Gas Turbines Multiple Choice Questions on “Speed Regulation and Parallel Operation”.
1. ___________ variations can also be used in speed regulation of gas turbines.
a) Pressure
b) Fuel flow
c) Temperature
d) None of the mentioned
Answer: b
Clarification: Fuel flow variations can be used in speed regulations in gas turbines.
2. Nozzle area variations are used in speed regulations in gas turbines.
a) True
b) False
Answer: a
Clarification: Fuel flow variations and nozzle area variations can be used in speed regulations in gas turbines.
3. If the electrical load is greater than the speed then _________
a) Turbine shuts down
b) Speed decreases
c) Speed increases
d) None of the mentioned
Answer: b
Clarification: When electrical load increases than the generation then turbine speed decreases.
4. When gas turbines are operated in parallel their disturbances ________
a) Increases
b) Decreases
c) Does not change
d) None of the mentioned
Answer: a
Clarification: When gas turbines are parallelly operated their disturbances increases.
5. In parallel operation speed governor is connected to ______________
a) digital set point
b) fuel system
c) actual speed
d) none of the mentioned
Answer: b
Clarification: In parallel operation speed governor is connected to fuel system.
6. Microprocessor based synchronizer operates on set point.
a) True
b) False
Answer: b
Clarification: Conventional synchronizing relay operates on set point.
7. Synchronizing relay has a time period of ___________
a) 5 minutes
b) 3 minutes
c) 6 minutes
d) 8 minutes
Answer: c
Clarification: Synchronizing relay has a time period of 6 minutes.
8. Microprocessor based synchronizer has a time period of _______
a) 4.5 minutes
b) 5 minutes
c) 8 minutes
d) 6 minutes
Answer: a
Clarification: Microprocessor synchronizer is an advanced synchronizer and has lesser time than synchronizing relay.
9. Inputs given to speed governor are __________
a) Digital set point
b) Actual speed
c) Digital set point & Actual speed
d) None of the mentioned
Answer: c
Clarification: Digital set point and actual speed are the inputs given to the speed governor.
10. PID controller is used to make the offset ________
a) Zero
b) Positive
c) Negative
d) None of the mentioned
Answer: a
Clarification: PID controller is used to make the offset zero.