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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The pressure of steam __________ while flowing through a nozzle.

  2. A.

    increases

    B.

    decreases

    C.

    remains constant


  3. The process of maintaining the speed of the turbine constant for various load conditions, is known as

  4. A.

    bleeding

    B.

    reheating

    C.

    governing

    D.

    none of these


  5. Reheating of steam in a turbine

  6. A.

    increases the workdone through the turbine

    B.

    increases the efficiency of the turbine

    C.

    reduces wear on the blades

    D.

    all of these


  7. Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?

  8. A.

    A steam turbine develops higher speeds

    B.

    The efficiency of steam turbine is higher

    C.

    The steam consumption is less

    D.

    all of these


  9. The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.

  10. A.

    same as

    B.

    2 times

    C.

    4 times

    D.

    8 times


  11. The ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

  12. A.

    blading efficiency

    B.

    nozzle efficiency

    C.

    stage efficiency

    D.

    mechanical efficiency


  13. The diagram efficiency is the ratio of

  14. A.

    workdone on the blades to the energy supplied to the blades

    B.

    workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

    C.

    energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

    D.

    none of the above


  15. The Rankine efficiency depends upon total useful heat drop and total isentropic heat drop.

  16. A.

    Correct

    B.

    Incorrect


  17. Blading efficiency is also known as

  18. A.

    stage efficiency

    B.

    diagram efficiency

    C.

    nozzle efficiency

    D.

    none of these


  19. The pressure of steam, in reaction turbines, is reduced in the fixed blades as well as in moving blades.

  20. A.

    Correct

    B.

    Incorrect