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Spontaneous combustion is a phenomenon in which

A. All the fuel burns instantaneously producing high energy release

B. Fuel burns with less air

C. Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

D. Explosion in furnace

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  1. The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised…
  2. An air preheater is installed
  3. A steam nozzle converts
  4. During storage, the heating value of coal
  5. The pressure of reheat steam after passing through reheater compared to inlet condition is
  6. Orsat meter is used for
  7. In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace…
  8. In a nozzle, whole frictional loss is assumed to occur between
  9. The selection of type and size of a steam boiler depends upon
  10. A stage, in reaction turbine, is represented by
  11. The length of Cornish boiler varies from
  12. When the nozzle operates with the maximum mass flow, the nozzle is said to be
  13. The fire tubes in, a Coarran and Scottish marine boiler are
  14. The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the…
  15. The temperature of flue gases at air heater outlet should be
  16. The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.
  17. The amount of water evaporated from feed water at _________ into dry and saturated steam at 100°…
  18. The basic purpose of drum in boiler is to
  19. The ratio of the useful heat drop to the isentropic heat drop is called
  20. The bituminous coal is no caking if its carbon content is
  21. Which type of boiler can meet rapid changes of load?
  22. Reheating of steam in a turbine
  23. Water boils when its vapour pressure
  24. In an ideal impulse turbine, the
  25. The discharge is __________ at critical pressure.
  26. The difference of supersaturated temperature and saturation temperature at that pressure is called
  27. An economiser is generally placed between
  28. The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water…
  29. Which of the following varieties of coals is mostly used in steam boilers?
  30. The maximum steam pressure in a Locomotive boiler is limited to