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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. Which of the following statement is correct?

  2. A.
    The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
    B.
    The compression ratio for the compressor is always greater than unity.
    C.
    The compressor capacity is the ratio of workdone per cycle to the stroke volume.
    D.
    During isothermal compression of air, the workdone in a compressor is maximum.

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  3. In the aircraft propellers

  4. A.
    the propulsive matter is ejected from within the propelled body
    B.
    the propulsive matter is caused to flow around the propelled body
    C.
    its functioning does not depend upon the presence of air
    D.
    none of the above

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  5. The type of rotary compressor used in gas turbines, is of

  6. A.
    centrifugal type
    B.
    axial flow type
    C.
    radial flow type
    D.
    none of these

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  7. The volume of air delivered by the compressor is called

  8. A.
    free air delivery
    B.
    compressor capacity
    C.
    swept volume
    D.
    none of these

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  9. The efficiency of a jet engine is higher at

  10. A.
    low speeds
    B.
    high speeds
    C.
    low altitudes
    D.
    high altitudes

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  11. In axial flow compressor, exit flow angle deviation from the blade angle is a function of

  12. A.
    blade camber
    B.
    blade camber and incidence angle
    C.
    space-chord ratio
    D.
    blade camber and space-chord ratio

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  13. Rotary compressors are used for delivering

  14. A.
    small quantities of air at high pressures
    B.
    large quantities of air at high pressures
    C.
    small quantities of air at low pressures
    D.
    large quantities of air at low pressures

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  15. Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.

  16. A.
    True
    B.
    False

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  17. A rotary compressor is driven by an

  18. A.
    electric motor
    B.
    engine
    C.
    either (a) or (b)
    D.
    none of these

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  19. In a centrifugal compressor, an increase in speed at a given pressure ratio causes

  20. A.
    increase in flow
    B.
    decrease in flow
    C.
    increase in efficiency
    D.
    increase in flow and decrease in efficiency

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