- (A) Type (solid, liquid or gaseous)
- (B) Calorific value
- (C) Sulphur content
- (D) Ignition temperature
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- (A) Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat
- (B) Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature
- (C) Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature
- (D) Adiabatic flame temperatures of actual combustions are always less than the maximum values
- (A) Cokes of high reactivity are obtained from weakly coking coals
- (B) Cokes of high reactivity are obtained from strongly coking coals
- (C) Reactivity of coke is inversely proportional to its absolute density
- (D) Abrasion index of the coke is a measure of its hardness
- (A) Oxygen content decreases from lignite to bituminous coal as the coalification increases
- (B) The less the oxygen content, better is the coal, as it reduces the calorific value
- (C) With increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases
- (D) All
- (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
- (B) Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
- (C) Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
- (D) None of these
- (A) Angle of repose of coal increases with its increasing size
- (B) Specific gravity of coal increases with its increasing maturity
- (C) Refractive index and reflectance of coal increases with the increasing rank of coal
- (D) Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal
- (A) Sewage gas
- (B) Refinery gas
- (C) Producer gas
- (D) Bagasse
- (A) Iron sulphate
- (B) Iron silicate
- (C) Lime and magnesia
- (D) All
- (A) 900
- (B) 4200
- (C) 7500
- (D) 2000
- (A) 8
- (B) 12
- (C) 22
- (D) 36
