Dankuni (West Bengal)
Dhanbad
Singreni (AP.)
Raniganj
✅ The correct answer is option A.
Fuel and Combustion MCQs
292. Coke oven gas constitutes mainly of
H₂ & CO
H₂ & CH₄
CH₄ & CO
H₂ & CO₂
✅ The correct answer is option B.
293. Fuel combustion is never cent per cent efficient due to
Incomplete combustion
Dry gas/stack gas loss
Moisture loss
All of the above
✅ The correct answer is option D.
294. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
3 & 10
10 & 3
10 & 20
15 & 8
✅ The correct answer is option B.
295. Main constituent of the gas produced from a gobar gas plant is
CO₂
CH₄
H₂
CO
✅ The correct answer is option B.
296. Low temperature carbonisation
Is mainly for producing the smokeless domestic coke
Is meant for the production of ‘metallurgical coke’
Produces higher quantity of gas than high temperature carbonisation
Produces less quantity of tar than high temperature carbonisation
✅ The correct answer is option A.
297. A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the ‘carpet loss’. The carpet loss may be of the order of __________ cms.
1 to 2
3 to 4
5 to 15
20 to 40
✅ The correct answer is option C.
298. Fussain
Is friable, charcoal like substance
Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
All of the above
✅ The correct answer is option D.
299. The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.
Fast & high
Slow & low
Slow & high
Fast & slow
✅ The correct answer is option A.
300. With increase in C/H ratio of a fuel, the dew point of flue gases
Increases
Decreases
Remains same
May increase or decrease ; depends on the type of fuel
✅ The correct answer is option B.