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Mechanical Engineering :: Steam Nozzles and Turbines

  1. In a single stage impulse turbine, the velocity of steam approaching nozzles is negligible.

  2. A.

    True

    B.

    False


  3. Curtis turbine is a

  4. A.

    simple reaction turbine

    B.

    velocity compounded turbine

    C.

    pressure compounded turbine

    D.

    pressure-velocity compounded turbine


  5. The velocity of steam at throat of the nozzle is __________ the velocity of sound.

  6. A.

    equal toless than

    B.

    less than

    C.

    more than


  7. The critical pressure ratio for initially dry saturated steam is

  8. A.

    0.546

    B.

    0.577

    C.

    0.582

    D.

    0.601


  9. The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.

  10. A.

    Agree

    B.

    Disagree


  11. The velocity of steam, in reaction turbines, is increased in the fixed blades as well as in moving blades.

  12. A.

    True

    B.

    False


  13. The critical pressure ratio for gases is

  14. A.

    0.528

    B.

    0.546

    C.

    0.577

    D.

    0.582


  15. The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

  16. A.

    same

    B.

    less

    C.

    more


  17. The effect of supersaturation is that the

  18. A.

    mass of the steam discharged increases

    B.

    entropy and specific volume of the steam increases

    C.

    exit velocity of steam reduces

    D.

    all of these


  19. The effect of friction on the flow of steam through a nozzle is todecrease the mass flow rate and to increase the wetness of steam

  20. A.

    decrease the mass flow rate and to increase the wetness of steam

    B.

    increase the mass flow rate and to increase the exit temperature

    C.

    decrease the mass flow rate and to decrease the wetness of steam

    D.

    increase the exit temperature without any effect on mass flow rate