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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. In a two stage reciprocating compressor with intercooler, the amount of work saved with incomplete intercooling is __________ that in case of complete intercooling.

  2. A.
    less than
    B.
    more than

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  3. The free air delivery is the volume of air that can be delivered by a compressor freely.

  4. A.
    True
    B.
    False

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  5. The ratio of the discharge pressure to the inlet pressure of air is called

  6. A.
    compression ratio
    B.
    expansion ratio
    C.
    compressor efficiency
    D.
    volumetric efficiency

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  7. A regenerator in a gas turbine improves thermal efficiency.

  8. A.
    Correct
    B.
    Incorrect

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  9. The velocity of air entering in a rocket is __________ as compared to an aircraft.

  10. A.
    zero
    B.
    less
    C.
    more
    D.
    same

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  11. A compressor mostly used for supercharging of I.C. engines is

  12. A.
    radial flow compressor
    B.
    axial flow compressor
    C.
    roots blower
    D.
    reciprocating compressor

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  13. The workdone on a compressor will be minimum if air is taken from

  14. A.
    the atmosphere
    B.
    a source at 0° C
    C.
    a source of low temperature air
    D.
    a source of high temperature air

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  15. In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

  16. A.
    atmosphere
    B.
    vacuum
    C.
    discharge nozzle
    D.
    back to the compressor

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