Multiple Choice Questions (MCQ) with Answers on Gas turbine power plants

Multiple Choice Questions (MCQ) with Answers on Gas turbine power plants

 

1-The major field(s) of application of gas turbine is (are)

  1. Aviation
  2. Oil and gas industry
  3. Marine propulsion
  4. All of the above

(Ans: d)

 

2-The following is (are) the limitation(s) of gas turbines.

  1. They are not self starting
  2. Higher rotor speeds
  3. Low efficiencies at part loads
  4. All of the above

(Ans: d)

 

3-The ratio of heat actually released by 1kg of fuel to heat that would be released by complete perfect combustion, is called

  1. Thermal efficiency
  2. Combustion efficiency
  3. Engine efficiency
  4. Compression efficiency

(Ans: b)

 

4-The percentage of total energy input appearing as net work output of the cycle

  1. Thermal efficiency
  2. Combustion efficiency
  3. Engine efficiency
  4. Compression efficiency

(Ans: a)

 

5-The following method(s) can be used to improve the thermal efficiency of open cycle gas turbine plant

  1. inter-cooling
  2. Reheating
  3. Regeneration
  4. All of the above

(Ans: d)

 

6-Which of the following is (are) used as starter for a gas turbine

  1. An Internal combustion engine
  2. A steam turbine
  3. An auxiliary electric motor
  4. All of the above

(Ans: d)

 

7-Gas turbine is shut down by

  1. Turning off starter
  2. Stopping the compressor
  3. Fuel is cut off from the combustor
  4. Any of the above

(Ans: c)

 

8-In gas turbine, intercooler is placed

  1. before low pressure compressor
  2. in between low pressure compressor and high pressure compressor
  3. in between high pressure compressor and turbine
  4. None of the above

(Ans: b)

 

9-In gas turbine, the function of Re-heater is to

  1. Heat inlet air
  2. Heat exhaust gases
  3. Heat air coming out of compressor
  4. Heat gases coming out of high pressure turbine

(Ans: d)

 

10-The ‘work ratio’ increases with

  1. increase in turbine inlet pressure
  2. decrease in compressor inlet temperature
  3. decrease in pressure ratio of the cycle
  4. all of the above

(Ans: d)

 

11-In the centrifugal compressor, total pressure varies

  1. directly as the speed ratio
  2. square of speed ratio
  3. cube of the speed ratio
  4. Any of the above

(Ans: b)

 

12-The efficiency of multistage compressor is _____ than a single stage.

  1. lower
  2. higher
  3. equal to
  4. Any of the above

(Ans: a)

 

13-In centrifugal compressor, power input varies as

  1. directly as the speed ratio
  2. the square of speed ratio
  3. the cube of the speed ratio
  4. Any of the above

(Ans: c)

 

14-In the _____ heat transfer takes place between the exhaust gases and cool air.

  1. Intercooler
  2. Re-heater
  3. Regenerator
  4. Compressor

(Ans: c)

 

15-In centrifugal compressor, the diffuser converts

  1. Kinetic energy into pressure energy
  2. Pressure energy into Kinetic energy
  3. Kinetic energy into Mechanical energy
  4. Mechanical energy into Kinetic energy

(Ans: a)