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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The economiser is used in boilers to

  2. A.

     Increase thermal efficiency of boiler

    B.

     Economize on fuel

    C.

     Extract heat from the exhaust flue gases

    D.

     Increase flue gas temperature


  3. The safety valve at superheater as compared to drum safety valve setting is set at

  4. A.

     Higher value

    B.

     Lower value

    C.

     Same value

    D.

     Any value


  5. Lancashire boiler is a

  6. A.

     Stationary fire tube boiler

    B.

     Stationary water tube boiler

    C.

     Water tube boiler with natural/forced circulation

    D.

     Mobile fire tube boiler


  7. The proximate analysis of fuel lists

  8. A.

     Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

    B.

     Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

    C.

     Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

    D.

     Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash


  9. The ultimate analysis of fuel lists

  10. A.

     Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

    B.

     Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

    C.

     Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

    D.

     Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash


  11. Which of the following compound steam engine requires a smaller flywheel?

  12. A.

     Receiver type

    B.

     Tandem type

    C.

     Woolf type

    D.

     All of these


  13. In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.

  14. A.

     Equal to

    B.

     Lower than

    C.

     Higher than

    D.

     None of these


  15. Latent heat of dry steam at atmospheric pressure is equal to

  16. A.

     539 kcal/ kg

    B.

     539 BTU/ lb

    C.

     427 kcal/ kg

    D.

     100 kcal/ kg


  17. Boiler stays are used to

  18. A.

     Prevent flat surfaces under pressure from tearing apart

    B.

     Take care of failure in shear

    C.

     Take care of failure in compression

    D.

     Provide support for boiler


  19. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

  20. A.

     Lancashire boiler

    B.

     Locomotive boiler

    C.

     Babcock and Wilcox boiler

    D.

     Benson boiler