250+ TOP MCQs on Closed Cycles and Operating Media Other than Air and Answers

Gas Turbines question bank on “Closed Cycles and Operating Media Other than Air”.

1. A closed cycle gas turbine uses gas as a working fluid.
a) True
b) False

Answer: a
Clarification: In a closed cycle gas turbine air is used as working fluid and working fluid moves in closed thermodynamic cycle.

2. In a closed cycle gas turbine heat is supplied from ____________
a) internal source
b) external source
c) combustion chamber
d) none of the mentioned

Answer: b
Clarification: In a closed cycle gas turbine heat is supplied from external source.

3. Pebble bed modular is reactor coupled with _________
a) helium closed cycle gas turbine
b) argon closed cycle gas turbine
c) gas cooled reactors
d) none of the mentioned

Answer: a
Clarification: Pebble bed modular reactor was made to work with helium closed cycle gas turbine.

4. At low temperature super critical CO2 closed cycle gas turbine has ________ efficiency when compared to helium closed cycle gas turbine.
a) low
b) high
c) optimum
d) none of the mentioned

Answer: b
Clarification: At low temperatures super critical CO2 closed cycle gas turbine has higher efficiency.

5. At high pressure super critical CO2 closed cycle gas turbine has ____________ efficiency when compared to helium closed cycle gas turbine.
a) optimum
b) high
c) low
d) none of the mentioned

Answer: c
Clarification: At high pressures super critical CO2 closed cycle gas turbine has low efficiency.

6. ML-1 nuclear reactor uses ________________
a) nitrogen based closed cycle gas turbine
b) helium based closed cycle gas turbine
c) super critical CO₂ closed cycle gas turbine
d) none of the mentioned

Answer: a
Clarification: In 1961 ML-1 Nuclear reactor used nitrogen based closed cycle gas turbine.

7. ML-1 Nuclear reactor works under ___________
a) 0.7 MPa
b) 0.9 MPa
c) 0.5 MPa
d) 0.3 MPa

Answer: b
Clarification: Nitrogen based closed cycle gas turbine works under 0.9MPa.

8. In thermodynamic cycles input to working fluid is given using ________
a) compressor
b) condensor
c) recuperator
d) none of the mentioned

Answer: a
Clarification: When it enters compressor its temperature is raised by means of increasing its pressure and that is how energy input is given.

9. Working fluids used in rankine cycles are _______
a) water/Steam
b) pentane
c) toluene
d) all of the mentioned

Answer: d
Clarification: Working fluids used in rankine cycles are
Water/Steam
Pentane
Toluene.

10. A pressurized fluid that actuates a machine is called as working fluid.
a) True
b) False

Answer: a
Clarification: A pressurized fluid that actuates a machine is called as working fluid.

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