Propane and acetylene
Propane and LPG
Sewage gas and gobar gas
B.F. gas and coke oven gas
✅ The correct answer is option A.
Fuel and Combustion MCQs
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
Because, it alone produces unreactive coke
Both A & B
Neither A nor B
✅ The correct answer is option C.
8. Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
Less air for combustion
Correct amount of air for combustion
Too much air for combustion
Pulverised coal in boilers
✅ The correct answer is option C.
9. Which of the following is a poisonous fuel gas?
Coke oven gas
Blast furnace gas
Natural gas
None of these
✅ The correct answer is option B.
10. In flue gas analysis by Orsat’s apparatus, oxygen is absorbed by
Potassium hydroxide
Cuprous chloride
Alkaline pyragllol solution
None of these
✅ The correct answer is option C.