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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

  2. A.

     Remains constant

    B.

     Decreases

    C.

     Increases

    D.

     None of these


  3. A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called

  4. A.

     Receiver type compound engine

    B.

     Tandem type compound engine

    C.

     Woolf type compound engine

    D.

     None of these


  5. Pick up the wrong statement about critical condition of steam

  6. A.

     Latent heat is zero

    B.

     Liquid directly becomes steam

    C.

     Specific volume of steam and liquid is same

    D.

     This is the maximum pressure limit


  7. Parson's turbine is a

  8. A.

     Simple impulse turbine

    B.

     Simple reaction turbine

    C.

     Impulse-reaction turbine

    D.

     None of these


  9. When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.

  10. A.

     Increases

    B.

     Decreases

    C.

     Remain same

    D.

     None of these


  11. Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value

  12. A.

     (1- moisture content)

    B.

     (1 + moisture content)

    C.

     1 + moisture content

    D.

     1 – moisture content


  13. Locomotive boiler is a

  14. A.

     Single tube, horizontal, internally fired and stationary boiler

    B.

     Single tube, vertical, externally fired and stationary boiler

    C.

     Multi-tubular, horizontal, internally fired and mobile boiler

    D.

     Multi-tubular, horizontal, externally fired and stationary boiler


  15. Throttle governing of steam engines is a method of controlling the engine output by varying

  16. A.

     Volume of intake steam

    B.

     Pressure of intake steam

    C.

     Temperature of intake steam

    D.

     All of these


  17. Cut-off governing of steam engines is a method of controlling the engine output by varying

  18. A.

     Volume of intake steam

    B.

     Pressure of intake steam

    C.

     Temperature of intake steam

    D.

     All of these


  19. Lancashire boiler is used where working pressure and power required are

  20. A.

     Low

    B.

     Moderate

    C.

     High

    D.

     None of these