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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. In a four stage compressor, if the pressure at the first and third stage are 1 bar and 16 bar, then the delivery pressure at the fourth stage will be

  2. A.
    1 bar
    B.
    16 bar
    C.
    64 bar
    D.
    256 bar

  3. The compressed air may be used

  4. A.
    in gas turbine plants
    B.
    for operating pneumatic drills
    C.
    in starting and supercharging of I.C. engines
    D.
    all of the above

  5. A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.

  6. A.
    equal to
    B.
    one-half
    C.
    double

  7. The volumetric efficiency for reciprocating air compressors is about

  8. A.
    10 to 40%
    B.
    40 to 60%
    C.
    60 to 70%
    D.
    70 to 90%

  9. The maximum temperature in a gas turbine is

  10. A.
    200°C
    B.
    500°C
    C.
    700°C
    D.
    1000°C

  11. The rotary compressors are suitable for large discharge of air at low pressure.

  12. A.
    True
    B.
    False

  13. The stagnation pressure rise in a centrifugal compressor takes place

  14. A.
    in the diffuser only
    B.
    in the impeller only
    C.
    in the diffuser and impeller
    D.
    in the inlet guide vanes only

  15. The total heat rejected in a reciprocating air compressor is equal to the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air.

  16. A.
    True
    B.
    False

  17. In a jet propulsion

  18. 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 presence of air
    D.
    none of the above

  19. An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.

  20. A.
    Yes
    B.
    No