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Mechanical Engineering :: Steam Nozzles and Turbines

  1. A single acting steam engine produces __________ power than that of double acting steam engine.

  2. A.

     Equal

    B.

     Half

    C.

     Double

    D.

     Four times

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  3. During storage, the heating value of coal

  4. A.

     Increases

    B.

     Decreases

    C.

     Remain constant

    D.

     May increase or decrease depending upon the method of storage

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  5. The equivalent evaporation is defined as

  6. A.

     The ratio of heat actually used in producing the steam to the heat liberated in the furnace

    B.

     The amount of water evaporated or steam produced in kg per kg of fuel burnt

    C.

     The amount of water evaporated from and at 100°C into dry and saturated steam

    D.

     The evaporation of 15.653 kg of water per hour from and at 100°C

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  7. A safety valve usually employed with stationary boilers is

  8. A.

     Lever safety valve

    B.

     Dead weight safety valve

    C.

     High steam and low water safety valve

    D.

     All of these

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

  10. A.

     Bleeding

    B.

     Reheating

    C.

     Governing

    D.

     None of these

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  11. A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

  12. A.

     Blow off cock

    B.

     Fusible plug

    C.

     Superheater

    D.

     Stop valve

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  13. Boiler H.P. is defined as the

  14. A.

     Steam evaporation rate per kg of fuel fired

    B.

     Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam

    C.

     The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam

    D.

     Work done by 1 kg of steam at saturation condition

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  15. The relative efficiency is defined as the

  16. A.

     Ratio of thermal efficiency to Rankine efficiency

    B.

     Ratio of brake power to the indicated power

    C.

     Ratio of heat equivalent to indicated power to the energy supplied in steam

    D.

     Product of thermal efficiency and Rankine efficiency

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  17. The indicated thermal efficiency is defined as the

  18. A.

     Ratio of thermal efficiency to the Rankine efficiency

    B.

     Ratio of brake power to the indicated power

    C.

     Ratio of heat equivalent to indicated power to the energy supplied in steam

    D.

     Product of thermal efficiency and Rankine efficiency

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  19. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by

  20. A.

     Horizontal straight line

    B.

     Vertical straight line

    C.

     Straight inclined line

    D.

     Curved line

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