Ash disposal problem
Excessive fly-ash discharge from the stack
High power consumption in its transportation
Erosion of induced draft fan blades
✅ The correct answer is option A.
Fuel and Combustion MCQs
302. Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in
Air
Oxygen
Either A or B
Either A or C without gain or loss of heat
✅ The correct answer is option D.
303. Volumetric ratio of N₂ to O₂ in dry atmospheric air is
0.21
3.76
4.76
0.79
✅ The correct answer is option B.
304. Which will have the least volatile matter and hence will be the most difficult to ignite?
Bituminous coal
Coke
Semi-bituminous coal
Aanthracite
✅ The correct answer is option B.
305. Water gas constitutes mainly of
CO & H₂
CO & N₂
CO₂ & H₂
CH₄ & H₂
✅ The correct answer is option A.
306. Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?
Ammonium sulphate
Ammonium nitrate
Ammonium phosphate
None of these
✅ The correct answer is option A.
307. Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
5
25
55
75
✅ The correct answer is option B.
308. Out of the following fuels, the difference between gross and net calorific value will be minimum in case of
Coke oven gas
Water gas
Natural gas
Blast furnace gas
✅ The correct answer is option D.
309. The internal energy of the combustion products is __________ compared to that of reactants.
More
Less
Equal
More or less ; (depends on the state of fuel.)
✅ The correct answer is option B.
310. Laboratory gas is obtained by the cracking of
Gasoline
Diesel
Fuel oil
Kerosene
✅ The correct answer is option D.