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Mechanical Engineering :: Steam Nozzles and Turbines

  1. In accelerated circulation type boiler

  2. A.

     Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

    B.

     Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

    C.

     Feed pump is employed to supplement natural circulation in water wall type furnace

    D.

     Water is converted into steam in one pass without any recirculation

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  3. In forced circulation type boiler

  4. A.

     Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

    B.

     Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

    C.

     Feed pump is employed to supplement natural circulation in water wall type furnace

    D.

     Water is converted into steam in one pass without any recirculation

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

  6. A.

     0.546

    B.

     0.577

    C.

     0.582

    D.

     0.601

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  7. Heating of dry steam above saturation temperature is known as

  8. A.

     Enthalpy

    B.

     Superheating

    C.

     Super saturation

    D.

     Latent heat

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  9. The chimney draught varies with

  10. A.

     Climatic conditions

    B.

     Temperature of furnace gases

    C.

     Height of chimney

    D.

     All of these

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  11. De-Laval turbine is a

  12. A.

     Simple impulse turbine

    B.

     Simple reaction turbine

    C.

     Impulse-reaction turbine

    D.

     None of these

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  13. The efficiency of steam turbines may be improved by

  14. A.

     Reheating of steam

    B.

     Regenerative feed heating

    C.

     Binary vapor plant

    D.

     Any one of these

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  15. Incomplete combustion can be best judged by

  16. A.

     Smoky chimney exit

    B.

     Excess air in flue gases

    C.

     Measuring carbon monoxide in flue gases

    D.

     Measuring temperature of flue gases at exit of furnace

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  17. Green coal, in order to be burnt, must be

  18. A.

     Heated sufficiently

    B.

     Burnt in excess air

    C.

     Heated to its ignition point

    D.

     Burnt as powder

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  19. The ratio of the workdone on the blades to the energy supplied to the blades, is called

  20. A.

     Blading efficiency

    B.

     Nozzle efficiency

    C.

     Gross or stage efficiency

    D.

     Mechanical efficiency

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