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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. The volume of air delivered in a medium capacity air compressor per unit time is

  2. A.
    0.1 to 1.2 m3/s
    B.
    0.15 to 5 m3/s
    C.
    above 5 m3/s
    D.
    none of these

  3. In a closed cycle gas turbine, the air is compressed

  4. A.
    isothermally
    B.
    polytropically
    C.
    isentropically
    D.
    none of these

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

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

  7. A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.

  8. A.
    Agree
    B.
    Disagree

  9. If the flow of air through the compressor is parallel to its axis, then the compressor is

  10. A.
    reciprocating compressor
    B.
    centrifugal compressor
    C.
    axial flow compressor
    D.
    turbo-compressor

  11. The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.

  12. A.
    Yes
    B.
    No

  13. A centrifugal compressor is an axial flow compressor.

  14. A.
    Correct
    B.
    Incorrect

  15. A compressor must be driven by some prime mover.

  16. A.
    Agree
    B.
    Disagree

  17. If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by


  18. Volumetric efficiency of a compressor decreases with __________ in compression ratio.

  19. A.
    decrease
    B.
    increase