0.21
3.76
4.76
0.79
✅ The correct answer is option B.
Engineering
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3142. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
0.5
10
50
500
✅ The correct answer is option B.
3143. Gobar gas is produced by the __________ of cown dung.
Fermentation
Oxidation
Hydrogenation
None of these
✅ The correct answer is option A.
3144. Which will have the least volatile matter and hence will be the most difficult to ignite?
Bituminous coal
Coke
Semi-bituminous coal
Aanthracite
✅ The correct answer is option B.
3145. Combustion of pulverised coal compared to the lumpy coal
Provides better control of furnace temperature
Facilitates combustion with lower excess air
Provides higher thermal efficiency & flame temperature
All of the above
✅ The correct answer is option D.
3146. With increases in carbonisation temperature
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.
3147. Water gas constitutes mainly of
CO & H₂
CO & N₂
CO₂ & H₂
CH₄ & H₂
✅ The correct answer is option A.
3148. 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.
3149. 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.
3150. Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?
Ammonium sulphate
Ammonium nitrate
Ammonium phosphate
None of these
✅ The correct answer is option A.