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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. A large clearance Volume in a reciprocating compressor results in

  2. A.
    reduced volume flow rate
    B.
    increased volume flow rate
    C.
    lower suction pressure
    D.
    lower delivery pressure

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  3. A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.

  4. A.
    same
    B.
    lower
    C.
    higher

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  5. Gas turbine as compared to steam turbine

  6. A.
    requires less space for installation
    B.
    has compressor and combustion chamber
    C.
    has less efficiency
    D.
    all of these

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  7. Intercooling in gas turbines

  8. A.
    decreases net output but increases thermal efficiency
    B.
    increases net output but decreases thermal efficiency
    C.
    decreases net output and thermal efficiency both
    D.
    increases net output and thermal efficiency both

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  9. When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

  10. A.
    equal to
    B.
    less than
    C.
    more than

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  11. The actual volume of air delivered by a compressor, When reduced to the normal temperature and pressure conditions is called compressor capacity.

  12. A.
    Yes
    B.
    No

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  13. The compression ratio in a gas turbine is

  14. A.
    4
    B.
    1
    C.
    9
    D.
    12

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  15. Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.

  16. A.
    Correct
    B.
    Incorrect

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  17. Only rocket engines can be propelled to space because

  18. A.
    they can generate very high thrust
    B.
    they have high propulsion efficiency
    C.
    these engines can work on several fuels
    D.
    they are not air-breathing engines

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  19. The maximum combustion pressure in gas turbine is __________ as compared to I.C. engine.

  20. A.
    more
    B.
    less

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