Coke even gas yield increases
Tar yield increases
Hydrogen percentage in the coke oven gas decreases
Methane percentage in the coke oven gas increases
✅ The correct answer is option A.
Fuel and Combustion MCQs
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
4
96
20
40
✅ The correct answer is option C.
Washing of coal does not reduce its
S & P content
Heating value
Fusion point of ash
None of these
✅ The correct answer is option D.
While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at
Dankuni (West Bengal)
Dhanbad
Singreni (AP.)
Raniganj
✅ The correct answer is option A.
Coke oven gas constitutes mainly of
H₂ & CO
H₂ & CH₄
CH₄ & CO
H₂ & CO₂
✅ The correct answer is option B.
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.
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.
Main constituent of the gas produced from a gobar gas plant is
CO₂
CH₄
H₂
CO
✅ The correct answer is option B.
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.
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.