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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

Compressors,Gas Dynamics and Gas Turbines - Section 1
Compressors,Gas Dynamics and Gas Turbines - Section 2
Compressors,Gas Dynamics and Gas Turbines - Section 3
Compressors,Gas Dynamics and Gas Turbines - Section 4

  1. For minimum work required to compress and deliver a quantity of air by multi-stage compression,

    2. A.
    the compression ratio in each stage should be same
    B.
    the intercooling should be perfect
    C.
    the workdone in each stage should be same
    D.
    all of the above

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  2. Separators are generally used in air compressor installations

    3. A.
    before the intercooler
    B.
    after the intercooler
    C.
    between the aftercooler and receiver
    D.
    before first stage suction

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  3. If the flow of air through the compressor is perpendicular to its axis, then it is a

    4. A.
    reciprocating compressor
    B.
    centrifugal compressor
    C.
    axial flow compressor
    D.
    turbo compressor

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  4. In air compressors, free air delivery means the

    5. 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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  5. The propulsive power of the rocket is (where v1 = Jet velocity, and v2 = Air-craft velocity)

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  6. The gas in cooling chamber of a closed cycle gas turbine is cooled at

    7. A.
    constant volume
    B.
    constant temperature
    C.
    constant pressure
    D.
    none of these

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  7. A 3 m3/min compressor means that it

    8. A.
    compresses 3 m3/min of standard air
    B.
    compresses 3 m3/ min of free air
    C.
    delivers 3 m3/ min of compressed air
    D.
    delivers 3 m3/ min of compressed air at delivery pressure

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  8. The compression ratio for the compressor is always __________ unity.

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

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  9. The assumption made in two stage compression with intercooler is that

    10. A.
    there is no pressure drop in the intercooler
    B.
    the compression in both the cylinders is polytropic
    C.
    the suction and delivery of air takes place at constant pressure
    D.
    all of the above

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  10. With the decrease in compression ratio, the volumetric efficiency

    11. A.
    does not change
    B.
    increases
    C.
    decreases

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