Gas Turbine Power Plant Objective Questions and Answers
Gas Turbine Power Plant
Gas Turbine Power Plant Objective Questions and Answers
1. Maximum temperature of a gas turbine plant is of the order of _________
a) 7000
b) 9000
c) 21000
d) 25000
Answer: 7000
2. For a gas turbine the pressure ratio in the range of _________
a) 2 to 3
b) 3 to 5
c) 16 to 18
d) 18 to 22
Answer: 3 to 5
3. What percent of installed capacity of gas turbines contribute to the total installed capacity of the power plants in India.
a) 5 %
b) 8 %
c) 11 %
d) 15 %
Answer: 11 %
4. What part or % of power developed is utilised for driving the compressor?
a) 65 %
b) 70 %
c) 55 %
d) 80 %
Answer: 65 %
5. 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: 30 kJ/litre
6. Thermal efficiency of a gas turbine power plant as compared to diesel engine plant is _______
a) Higher
b) Lower
c) Same
d) May be higher or lower
Answer: Lower
7. Gas turbine power plant is _________ efficient than steam turbine plant
a) More
b) Less
c) Same
d) None of the above
Answer: More
8. Maximum combustion pressure in a gas turbine is _________ as compared to diesel engine
a) Same
b) Less
c) More
d) None of the above
Answer: Less
9. In a two stage gas turbine plant,reheating after first stage _________
a) Increases work ratio
b) Decreases work ratio
c) Does not effect work ratio
d) None of the above
Answer: Increases work ratio
10. In a two stage gas turbine plant,with intercooling and reheating _________
a) Both work ratio and thermal efficiency improve
b) Work ratio improves but thermal efficiency decreases
c) Thermal efficiency improves but work ratio decreases
d) Both work ratio and thermal efficiency decreases
Answer: Work ratio improves but thermal efficiency decreases
11. The blades of the gas turbine rotor are made of _________
a) Carbon steel
b) Stainless steel
c) High alloy steel
d) High nickel alloy
Answer: High nickel alloy
12. Mechanical efficiency of a gas turbine as compared to internal combustion reciprocating engine is _________
a) Higher
b) Lower
c) Same
d) Un-predictable
Answer: Higher
13. In a two stage gas turbine plant,reheating after first stage _________
a) Decrease the thermal efficiency
b) Increase the thermal efficiency
c) Does not effect the thermal efficiency
d) None of the above
Answer: Decrease the thermal efficiency7000
14. The thermal efficiency of a gas turbine with ideal regenerative heat exchanger is _________
a) Equal to work ratio
b) Less than work ratio
c) More than work ratio
d) Um-predictable
Answer: Equal to work ratio
15. Thermal efficiency of a closed cycle gas turbine plant increases by _________
a) Reheating
b) Intercooling
c) Regenerator
d) All of the above
Answer: All of the above
16. Name the turbine developed on the basis of aircraft engine technology.
a) Brayton
b) Aerodynamic
c) Aero derivative.
d) Rankine
Answer: Aero derivative
17. Which state in India among these doesn’t have a gas turbine plant?
a) Jammu Kashmir.
b) Tripura
c) Tamil Nadu.
d) Bihar.
Answer: Tamil Nadu.
18. The gas turbines are mainly used in?
a) Locomotives.
b) Aircrafts.
c) Automobiles.
d) Pumping stations.
Answer: Automobiles.
19. A gas turbine works on which cycle?
a) Carnot.
b) Brayton.
c) Dual cycle.
d) Rankine cycle.
Answer: Brayton.
20. Gas turbine plants are not used
a) As peak load plants.
b) As base load plants.
c) As standby power plants.
d) In combination with the steam power plants.
Answer: As base load plants.
21. Combined cycle power plants are suitable for?
a) Base loads.
b) Peak loads.
c) Intermediate loads.
d) Both base and peak loads.
Answer: Both base and peak loads.
22. In a gas turbine plant,a regenerator increases _________
a) Work output
b) Pressure ratio
c) Thermal efficiency
d) All of the above
Answer: Thermal efficiency
23. In a gas tirbine,high therml efficiency is obtained in _________
a) Closed cycle
b) Open cycle
c) In both the cycles
d) All the above cycles
Answer: Closed cycle
24. Capital cost of a gas turbine plant _________ than that of a steam power plant of same capacity
a) Same
b) Lower
c) Higher
d) None of the above
Answer: Lower
25. 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: Combustion efficiency
26. What is the air standard cycle for a Gas-Turbine called?
a) Reheat cycle
b) Rankine cycle
c) Brayton cycle
d) Diesel cycle
Answer: Brayton cycle
27. In centrifugal compressor, the diffuser converts _________
a) Kinetic energy into pressure energy
b) Pressure energy into Kinetic energy
c) Kinetic energy into Mechanical energy
d) Mechanical energy into Kinetic energy
Answer: Kinetic energy into pressure energy
28. 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: working fluid in a Brayton cycle doesn’t undergo phase change while it does in Rankine cycle
29. 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: Open
30. A Gas Turbine is which type of combustion plant?
a) external
b) open
c) internal
d) cannot say
Answer: internal
31. Power is produced when the working fluid does some work on the?
a) Shaft
b) Fins
c) Blades
d) None of the mentioned
Answer: Blades
32. Which among these is the main component of a gas turbine plant?
a) Condenser
b) Compressor
c) Boiler
d) Both Compressor & Boiler
Answer: Compressor
33. 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: Natural gas and liquid petroleum fuel
34. 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: Multistage axial flow compressor
35. In the centrifugal compressor, total pressure varies _____________
a) directly as the speed ratio
b) square of speed ratio
c) cube of the speed ratio
d) all of the mentioned
Answer: square of speed ratio
36. Which of these is not a part of a Gas Turbine Plant?
a) Compressor
b) Gas Turbine
c) Combustion chamber
d) Boiler
Answer: Boiler
37. 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: All of the mentioned
38. 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 mentione
Answer: All of the mentione
39. 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: Thermal efficiency
40. 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: All of the mentioned
41. 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: All of the mentioned
42. In gas turbine, intercooler is placed _____________
a) before low pressure compressor
b) in between low pressure compressor and high pressure compressor
c) in between high pressure compressor and turbine
d) none of the mentioned
Answer: in between low pressure compressor and high pressure compressor
43. 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: Fuel is cut off from the combustor
44. The efficiency of multistage compressor is _____ than a single stage.
a) lower
b) higher
c) equal to
d) all of the mentioned
Answer: lower
45. In gas turbine, what is the function of Re-heater?
a) Heat inlet air
b) Heat exhaust gases
c) Heat air coming out of compressor
d) Heat gases coming out of high pressure turbine
Answer: Heat gases coming out of high pressure turbine
46. The ‘work ratio’ increases with _____________
a) increase in turbine inlet pressure
b) decrease in compressor inlet temperature
c) decrease in pressure ratio of the cycle
d) all of the mentioned
Answer: all of the mentioned
47. Air standard cycle for a Gas-Turbine called _________ cycle
a) Reheat cycle
b) Rankine cycle
c) Brayton cycle
d) Diesel cycle
Answer: Brayton cycle
48. In the ____________ heat transfer takes place between the exhaust gases and cool air.
a) Intercooler
b) Re-heater
c) Regenerator
d) Compressor
Answer: Regenerator
49. 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: Before starting the gas turbine
50. In centrifugal compressor, power input varies as _________
a) directly as the speed ratio
b) the square of speed ratio
c) the cube of the speed ratio
d) all of the mentioned
Answer: the cube of the speed ratio
Compressor in gas turbine plant Multiple Choice Questions (MCQ) with answers
1. What part or % of power developed is utilised for driving the compressor?
a) 65 %
b) 70 %
c) 55 %
d) 80 %
Answer: 65 %
2. 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: 30 kJ/litre
3. 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: Natural gas and liquid petroleum fuel.
4. 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: Before starting the gas turbine
5. Which type of compressor is used in a gas turbine plant?
a) Reciprocating compressor.
b) Screw compressor.
c) Multistage axial flow compressor.
d) Either (a) & (b)
Answer: Multistage axial flow compressor.
6. Which among these is the main component of a gas turbine plant?
a) Condenser
b) Compressor.
c) Boiler
d) Both (b) & (c).
Answer: Compressor.
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