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Compressors - Interview Questions and Answers

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16. Gas turbine blades are given a rake
A. equal to zero
B. in the direction of motion of blades
C. opposite to the direction of motion of blades
D. depending on the velocity
E. none of the above.
Explanation:
17. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
A. remain same
B. decrease
C. increase
D. unpredictable
E. none of the above.
Explanation:
18. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches
A. isothermal
B. isentropic
C. adiabatic
D. isochoric
E. isobaric.
Explanation:
19. It is not possible to use closed gas turbine cycle in aeronautical engines because
A. it is inefficient
B. it is bulky
C. it requires cooling water for its operation
D. c
E. opt 5
Explanation:
20. Pick up the correct statement
A. gas turbine uses low air-fuel ratio to economies on fuel
B. gas turbine uses high air-fuel ratio to reduce outgoing temperature
C. gas turbine uses low air-fuel ratio to develop the high thrust required
D. all of the above
E. none of the above.
Explanation:
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