2922. Benzol is used
As a motor fuel blend
For producing benzene, tolune & xylene by its distillation
Both A & B
Neither A nor B
✅ The correct answer is option C.
2927. Coke oven gas compared to blast furnace gas is
More explosive and inflammable
Less poisonous
Lighter
All of the above
✅ The correct answer is option D.
2930. Presence of phosphorous in metallurgical coal
Is not undersirable
Reduces its calorific value
Badly affects the quality of steel
Increases its caking power
✅ The correct answer is option C.
2934. The most matured coal out of the following is
Lignite
Semi-anthracite
Sub-bituminous
Bituminous
✅ The correct answer is option B.
2940. Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
Calorific value
Higher C/H ratio
Sulphur content
Difference in gross & net calorific value
✅ The correct answer is option B.
2944. Which of the following is coking?
Vitrain
Fussain
Both A & B
Neither A nor B
✅ The correct answer is option A.
2910. During the carbonisation of coal
All tar is evolved at < 600°C
Evolution of H₂ and formation of methane and aromatics occur at > 700°C
Hard semi-coke starts shrinking at 600°C
All of the above
✅ The correct answer is option D.
2916. When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.
Carbonisation
Oxidation
Coalification
Gasification
✅ The correct answer is option D.
2923. About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.
2
3
5
1
✅ The correct answer is option C.
2928. Compound coke ovens are those which can be heated by
Both steam and electrical power
Lean gas (e.g., B.F. gas)
Rich gas (e.g., coke oven gas)
Both B and C
✅ The correct answer is option D.