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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. The performance of air compressor at high altitudes will be __________ as compared to that at sea level.

  2. A.
    same
    B.
    lower
    C.
    higher

  3. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

  4. A.
    diffuser inlet radius
    B.
    diffuser outlet radius
    C.
    impeller inlet radius
    D.
    impeller outlet radius

  5. In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.

  6. A.
    Yes
    B.
    No

  7. In gas turbines, the work input with intercooling is __________ the work input with no intercooling.

  8. A.
    less man
    B.
    more than

  9. The compressor capacity will be __________ if the temperature of intake air is lowest.

  10. A.
    lowest
    B.
    highest

  11. For perfect intercooling in a three stage compressor,

  12. A.
    B.
    C.
    p1p2 = p3p4
    D.
    p1p3 = p2p4

  13. A machine used to raise the pressure of air is called

  14. A.
    gas turbine
    B.
    I.C engine
    C.
    compressor
    D.
    air motor

  15. The overall efficiency of the compressed air system is the

  16. A.
    ratio of shaft output of the air motor to the shaft input to the compressor
    B.
    ratio of shaft input to the compressor to the shaft output of air motor
    C.
    product of shaft output of air motor and shaft input to the compressor
    D.
    none of the above

  17. In a jet engine, the compression varies as the square of the speed.

  18. A.
    Correct
    B.
    Incorrect

  19. In a single acting reciprocating air compressor, without clearance, the compression of air may be

  20. A.
    isothermal
    B.
    polytropic
    C.
    isentropic
    D.
    any one of these