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Mechanical Engineering :: Steam Nozzles and Turbines

  1. Gusset stays in a boiler are provided to

  2. A.

     Prevent the bulging of flat surfaces

    B.

     Avoid explosion in furnace

    C.

     Prevent leakage of hot flue gases

    D.

     Support furnace freely from top

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  3. Evaporative capacity of boiler is expressed as

  4. A.

     kg of steam produced

    B.

     Steam pressure produced

    C.

     kg of fuel fired

    D.

     kg of steam produced per kg of fuel fifed

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  5. It is required to produce large amount of steam at low pressure. Which boiler should be used?

  6. A.

     Pulverized fuel fired boiler

    B.

     Cochran boiler

    C.

     Lancashire boiler

    D.

     Babcock and Wilcox boiler

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  7. Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

  8. A.

     And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

    B.

     And its corresponding conversion into dry steam at desired boiler pressure

    C.

     Conversion into steam at atmospheric condition

    D.

     Conversion into steam at the same pressure at which feed water is supplied

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  9. The effect of friction in the nozzle __________ dryness fraction of steam.

  10. A.

     Has no effect on

    B.

     Decreases

    C.

     Increases

    D.

     None of these

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  11. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

  12. A.

     Remains same

    B.

     Decreases

    C.

     Increases

    D.

     None of these

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  13. Rateau turbine is

  14. A.

     Simple reaction turbine

    B.

     Velocity compounded turbine

    C.

     Pressure compounded turbine

    D.

     Pressure-velocity compounded turbine

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  15. The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

  16. A.

     Increases

    B.

     Decreases

    C.

     Remains unchanged

    D.

     Increases/decreases depending on steam temperature requirements

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  17. Sulphur content of fuels is very important to the plant operators because it

  18. A.

     Has high heating value

    B.

     Retards electric precipitation

    C.

     Promotes complete combustion

    D.

     Has highly corrosive effect

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  19. A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

  20. A.

     Steam condenser

    B.

     Steam boiler

    C.

     Steam preheater

    D.

     Economiser

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