Burn CO to CO₂
Dry and transport the coal
Have proper combustion by supplying it around the burner
Preheat the tertiary air used for complete combustion of CO to CO₂
✅ The correct answer is option B.
Fuel and Combustion MCQs
Which of the following is not a ‘manufactured’ fuel?
LPG
Coal briquettes
Tar
Colloidal fuels
✅ The correct answer is option C.
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
Shallow and small piles
Fine sizes without the presence of any lump
Closed space without any ventilation facility
Large heaps with small surface to volume ratio
✅ The correct answer is option A.
‘Fat coals’ are those coals which have very high
Caking capacity
Volatile matter content
Fusion point of its ash
Inherent moisture content
✅ The correct answer is option A.
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
Propane and acetylene
Propane and LPG
Sewage gas and gobar gas
B.F. gas and coke oven gas
✅ The correct answer is option A.
Nitrogen in coal
Is present upto 1-2%
Comes from protein in parent vegetable matter
Is recovered as ammonia during its carbonisation
All of the above
✅ The correct answer is option D.
Atomising steam to fuel oil ratio in a burner should be around
0.5
1.5
2.5
3.5
✅ The correct answer is option A.
Flue gas from the heating chamber of byproduct coke ovens is removed by
Forced draft fan
Induced draft fan
Steam ejector
Natural draft
✅ The correct answer is option D.
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.
80 and 97
95 and 100
40 and 70
25 and 97
✅ The correct answer is option A.
Use of excess of combustion air in the combustion of fuels results in
Heat losses
Long flame
Condensation of water vapour from the fuel gas
None of these
✅ The correct answer is option A.