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An economiser is generally placed between

A. Last superheater or reheater and air preheater

B. Induced draft fan and forced draft fan

C. Air preheater and chimney

D. None of the above

Correct Answer : A.


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  1. The friction present between the steam and the nozzle surfaces reduces the heat drop by
  2. The natural draught is produced by
  3. The increase in pressure
  4. Steam exhaust from high pressure turbine is reheated in
  5. In a reaction turbine
  6. The impulse reaction turbine has its driving force
  7. Over fire burning is the phenomenon of
  8. The proximate analysis of fuel lists
  9. Which of the following boilers is best suited to meet fluctuating demands?
  10. Which of the following statement is correct?
  11. A device used to increase the temperature of saturated steam without raising its pressure, is called
  12. A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine…
  13. The steam enters the nozzle at a
  14. The amount of water evaporated in kg per kg of fuel burnt is called
  15. The maximum efficiency of a reaction turbine is
  16. At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is
  17. The velocity of steam at throat of the nozzle is __________ the velocity of sound.
  18. The fire tubes in, a Coarran and Scottish marine boiler are
  19. An economiser in a boiler
  20. The fire tubes in a Cochran boiler usually have _________ diameter.
  21. Which of the following is a fire tube boiler?
  22. It is required to produce large amount of steam at low pressure. Which boiler should be used?
  23. Which of the following coals has the highest calorific value?
  24. The process of draining steam from the turbine, at certain points during its expansion and using this…
  25. The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water…
  26. The high steam and low water safety valve is not used in
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  28. Steam in water tube boiler as compared to fire tube boiler
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  30. In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle…