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A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimney, is known as

A. Economiser

B. Fusible plug

C. Superheater

D. Stop valve

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  1. In fire tube boilers
  2. The average value of diagram factor lies between
  3. A stage, in reaction turbine, is represented by
  4. The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become
  5. The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure…
  6. Boiler stays are used to
  7. The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)
  8. The temperature of flue gases at air heater outlet should be
  9. Over fire burning is the phenomenon of
  10. Tertiary air is the air used to
  11. The chimney draught varies with
  12. By compounding the expansion of steam in two or more cylinders, the ratio of expansion
  13. The factor of evaporation for all boilers is always
  14. The function of a flywheel is
  15. The flow of steam is supersonic
  16. The velocity of steam at throat of the nozzle is __________ the velocity of sound.
  17. The amount of water evaporated in kg per kg of fuel burnt is called
  18. In water wall furnace, the heat is transferred to the water walls by
  19. During storage, the heating value of coal
  20. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
  21. The diameter of cylindrical shell of the Lancashire boiler is of the order of
  22. The process of maintaining the speed of the turbine constant for various load conditions, is known as
  23. The number of drums in Benson steam generator is
  24. The function of injector used in small steam plants is to
  25. The variation of steam pressure in the nozzle depends upon
  26. A safety valve mainly used with locomotive and marine boilers is
  27. The effect of bleeding is that
  28. Evaporative capacity of boiler is expressed as
  29. In natural circulation type boiler,
  30. Which is not correct statement about effect of sulphur in fuel?