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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The diagram factor is the ratio of the

  2. A.

     Area of the actual indicator diagram to the area of theoretical indicator diagram

    B.

     Actual workdone per stroke to the theoretical workdone per stroke

    C.

     Actual mean effective pressure to the theoretical mean effective pressure

    D.

     Any one of the above


  3. Sublimation region is the region where

  4. A.

     Solid and vapor phases are in equilibrium

    B.

     Solid and liquid phases are in equilibrium

    C.

     Liquid and vapor phases are in equilibrium

    D.

     Solid, liquid and vapor phases are in equilibrium


  5. In reaction turbines, the axial thrust is due to

  6. A.

     Pressure drop across the rotor

    B.

     Change in axial velocity

    C.

     Both (A) and (B)

    D.

     None of these


  7. In a nozzle, whole frictional loss is assumed to occur between

  8. A.

     Inlet and throat

    B.

     Inlet and outlet

    C.

     Throat and exit

    D.

     All of these


  9. Water tube boilers are

  10. A.

     Internally fired

    B.

     Externally fired

    C.

     Internally as well as externally fired

    D.

     None of these


  11. Fire tube boilers are

  12. A.

     Internally fired

    B.

     Externally fired

    C.

     Internally as well as externally fired

    D.

     None of these


  13. The feed check valve is used in order to

  14. A.

     Regulate flow of boiler water

    B.

     Check level of water in boiler drum

    C.

     Recirculate unwanted feed water

    D.

     Allow high pressure feed water to flow to drum and not allow reverse flow to take place


  15. The ratio of the volume at cut-off to the swept volume is called

  16. A.

     Cut-off ratio

    B.

     Expansion ratio

    C.

     Clearance ratio

    D.

     None of these


  17. The ratio of the clearance volume to the swept volume is called

  18. A.

     Cut-off ratio

    B.

     Expansion ratio

    C.

     Clearance ratio

    D.

     None of these


  19. An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.

  20. A.

     Equal

    B.

     Less

    C.

     More

    D.

     None of these