401. With increase in moisture content of coal, its
Calorific value increases sometimes
Bulk density always decreases
Clinkering tendency during combustion increases
None of these
✅ The correct answer is option D.
Fuel and Combustion MCQs
402. Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
H₂
CH₄
CO₂
N₂
✅ The correct answer is option B.
403. Adiabatic flame temperature of a fuel is dependent on the initial temperature of
Fuel
Air
Both A & B
Neither A nor B
✅ The correct answer is option C.
404. A good coking coal should have high __________ content.
Ash
Sulphur & phosphorus
Moisture
None of these
✅ The correct answer is option D.
405. Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.
Bomb
Boy’s
Junkar’s
None of these
✅ The correct answer is option A.
406. Percentage of methane in coke oven gas may be around
5
15
25
50
✅ The correct answer is option C.
407. Main constituent of natural gas is
CH₄ (upto 90%)
C₂H₆
C₃H₈
H₂
✅ The correct answer is option A.
408. Volatile matter content in coking coal may be about __________ percent.
1
7
22
46
✅ The correct answer is option C.
409. Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.
1100
1250
1350
1400
✅ The correct answer is option A.
410. In Lurgi coal gasifier,
Coking coals cannot be used
Low carbon conversion efficiency is achieved
Entrainment of solids is higher
Larger quantity of coal can be processed
✅ The correct answer is option D.