3140. Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
<120
>120
<90
90-110
✅ The correct answer is option B.
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.
3151. 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.
3156. 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.
3161. Main constituent of the gas produced from a gobar gas plant is
CO₂
CH₄
H₂
CO
✅ The correct answer is option B.
3166. 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.
3171. 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.
3176. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
Ash disposal problem
Excessive fly-ash discharge from the stack
High power consumption in its transportation
Erosion of induced draft fan blades
✅ The correct answer is option A.
3141. Volumetric ratio of N₂ to O₂ in dry atmospheric air is
0.21
3.76
4.76
0.79
✅ The correct answer is option B.
3147. Water gas constitutes mainly of
CO & H₂
CO & N₂
CO₂ & H₂
CH₄ & H₂
✅ The correct answer is option A.