41. Function of secondary air in pulverised coal firing is to
42. 'Mixed gas' used in steel plants is a mixture of
43. The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be
44. Blast furnace coke is made from coal by
45. Blast furnace gas constitutes mainly of
46. The advantage of firing pulverised coal in the furnace lies in the fact, that it
47. Naphthalene is used for making
48. Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?
49. Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.
50. Low temperature oxidation of coal resulting from bad storage conditions does not decrease its
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