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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. A compressor at high altitudes will require __________ power.

    2. A.
    same
    B.
    less
    C.
    more

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  2. The mean effective pressure of the compressor is the

    3. 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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  3. The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is

    4. A.
    pressure drop across the valves
    B.
    superheating in compressor
    C.
    clearance volume and leakages
    D.
    all of these

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  4. For minimum work in multi-stage compression, the workdone on all stages should be equal.

    5. A.
    Yes
    B.
    No

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  5. The thrust of a jet propulsion power unit can be increased by

    6. A.
    injecting water into the compressor
    B.
    burning fuel after gas turbine
    C.
    injecting ammonia into the combustion chamber
    D.
    all of the above

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  6. Which of the following statement is correct?

    7. A.
    The reciprocating compressors are best suited for high pressure and low volume capacity
    B.
    The effect of clearance volume on power consumption is negligible for the same volume of discharge
    C.
    both (a) and (b)
    D.
    none of these

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  7. Slip factor in a centrifugal compressor indicates the amount of air leaked from the storage vessel.

    8. A.
    Yes
    B.
    No

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  8. The ratio of the isentropic work to the Euler's work is known as pressure coefficient.

    9. A.
    Yes
    B.
    No

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  9. A turbo-prop is preferred to turbo-jet because

    10. A.
    it has high propulsive efficiency at high speeds
    B.
    it can fly at super sonic speeds
    C.
    it can fly at high elevations
    D.
    it has high power for take off

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  10. The air power of the compressor is also known as

    11. A.
    indicated power
    B.
    brake power
    C.
    frictional power
    D.
    none of these

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