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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

  2. A.
    rγ - 1
    B.
    1 - rγ - 1
    C.
    D.

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  3. The speed of rotary air compressor is __________ as compared to reciprocating air compressor.

  4. A.
    high
    B.
    low

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  5. When air is to be compressed at a high pressure, then it is advantageous to use

  6. A.
    single stage compression
    B.
    multi-stage compression without intercooling
    C.
    multi-stage compression with intercooling
    D.
    none of these

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  7. The absolute pressure of air at the outlet of a compressor is called

  8. A.
    back pressure
    B.
    critical pressure
    C.
    discharge pressure
    D.
    none of these

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  9. The degree of reaction is usually kept __________ for all types of axial flow compressors.

  10. A.
    0.2
    B.
    0.3
    C.
    0.4
    D.
    0.5

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  11. Standard air is the air at __________ and relative humidity of 36 percent.

  12. A.
    0.1 bar and 20° C
    B.
    1 bar and 20° C
    C.
    0.1 bar and 40° C
    D.
    1 bar and 40° C

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  13. In a single stage, single acting reciprocating air compressor without clearance volume, the workdone is maximum during

  14. A.
    isothermal compression
    B.
    isentropic compression
    C.
    polytropic compression
    D.
    none of these

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  15. The compressor capacity is defined as the

  16. A.
    actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
    B.
    volume of air delivered by the compressor
    C.
    volume of air sucked by the compressor during its suction stroke
    D.
    none of the above

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  17. In n1 and n2 are the indices of compression for the first and second stage of compression, then the ratio of workdone on the first and second stages (W1/W2) with perfect intercoooing is given by

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  19. The operation of the reciprocating air motor is similar to reciprocating air compressor.

  20. A.
    True
    B.
    False

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