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Mechanical Engineering :: Compressors,Gas Dynamics and Gas Turbines

  1. Which of the following statement is correct relating to rocket engines ?

  2. A.
    The combustion chamber in a rocket engine is directly analogous to the reservoir of a super sonic wind tunnel
    B.
    The stagnation conditions exist at the combustion chamber
    C.
    The exit velocities of exhaust gases are much higher than those in jet engine
    D.
    all of the above

  3. In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.

  4. A.
    Correct
    B.
    Incorrect

  5. Euler's equation can be used for

  6. A.
    radial flow compressors
    B.
    axial flow compressors
    C.
    pumps
    D.
    all of these

  7. A rocket engine uses __________ for the combustion of its fuel.

  8. A.
    surrounding air
    B.
    compressed atmospheric air
    C.
    its own oxygen
    D.
    none of these

  9. The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.

  10. A.
    Agree
    B.
    Disagree

  11. In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.

  12. A.
    more
    B.
    less

  13. The efficiency of roots blower __________ with the increase in pressure ratio.

  14. A.
    decreases
    B.
    increases
    C.
    does not change

  15. The operation of lifts, rams and pumps make use of compressed air.

  16. A.
    Yes
    B.
    No

  17. A jet engine has

  18. A.
    no propeller
    B.
    propeller in front
    C.
    propeller at back
    D.
    propeller on the top

  19. A receiver in compressor installations is used to damp pressure waves in compressor discharge.

  20. A.
    Yes
    B.
    No