3398. Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.
H₂O
CO₂
CO
CH₄
✅ The correct answer is option C.
3405. Which of the following is not a product of tar distillation?
Phenol & naphthalene
Benzol & pitch
Anthracene & creosote
None of these
✅ The correct answer is option D.
3372. Anthracite can be used for
Recarbonising steel
Making carbon electrodes
Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke
All of the above
✅ The correct answer is option D.
3375. Preheating of a gaseous fuel results in increased
Flame length
Flame temperature
Quantity of flue gas
Ignition temperature
✅ The correct answer is option B.
3379. __________ present in coal is not determined in its ultimate analysis.
Fixed carbon
Total carbon
Hydrogen
Nitrogen
✅ The correct answer is option A.
3386. Anthracite coal
Contains more volatile matter than bituminous coal
Ignites more easily than bituminous coal
Is essentially a coking coal
Burns with short, bluish, yellow-tipped flame producing very little smoke
✅ The correct answer is option D.
3389. 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.
3394. Percentage of methane in coke oven gas may be around
5
15
25
50
✅ The correct answer is option C.
3399. 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.
3406. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
Density
Porosity
Electrical resistivity
None of these
✅ The correct answer is option A.