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Which of the following varieties of coals is mostly used in steam boilers?

A. Non-coking bituminous coal

B. Brown coal

C. Peat

D. None of the above

Correct Answer : D.


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  1. Fire tube boilers are limited to a maximum working pressure of
  2. Maximum energy loss in a boiler occurs due to
  3. When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent…
  4. The cylinder condensation or missing quantity may be reduced by
  5. Cut-off ratio is the ratio of
  6. The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
  7. All steam engines work on
  8. Spontaneous combustion is a phenomenon in which
  9. The draught may be produced by a
  10. The friction present between the steam and the nozzle surfaces reduces the heat drop by
  11. A supercritical boiler is one that operates above the pressure and temperature of following values
  12. The number of flue tubes in Lancashire boiler is
  13. A single acting steam engine produces ________ power than that of double acting steam engine.
  14. At very low temperature, the melting and boiling temperatures become equal. This temperature is
  15. Incomplete combustion can be best judged by
  16. The temperature of flue gases at air heater outlet should be
  17. De-Laval turbine is a
  18. The coal requirement per kW hour generation in the thermal power plant is of the order of
  19. The flow of steam is supersonic
  20. The water tubes in a simple vertical boiler are
  21. In a throttling process
  22. Which of the following is a fire tube boiler?
  23. The nozzle efficiency is the ratio of
  24. During storage, the heating value of coal
  25. The average value of diagram factor lies between
  26. Degree of reaction is defined as the ratio of
  27. The economiser is used in boilers to
  28. The bituminous coal is no caking if its carbon content is
  29. The critical pressure gives the velocity of steam at the throat
  30. The mechanical draught _________ with the amount of smoke.