2932. Which of the following is used for making the explosive ‘TNT’?
Benzol
Toluene
Pyridine
Cerosote
✅ The correct answer is option B.
2935. A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that
21% excess air has been used for combustion
21% excess oxygen has been used for combustion
Complete combustion of fuel has taken place
No excess air has been used for combustion
✅ The correct answer is option C.
2941. Bituminous coal
Ignites less easily than anthracite
Is generally coking
Burns with smoky yellow flame
Both B and C
✅ The correct answer is option D.
2945. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always
1
< 1
> 1
Unpredictable
✅ The correct answer is option C.
2912. Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
2CO ⟷ C + CO₂
CO + H₂O ⟷ CO₂ + H₂
C + H₂O ⟷ CO + H₂
C + 2H₂O ⟷ CO₂ + 2H₂
✅ The correct answer is option A.
2919. Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.
300
2000
5000
10000
✅ The correct answer is option B.
2924. Fusion point of coal ash increases with increase in its __________ content.
Iron sulphate
Iron silicate
Lime and magnesia
All of the above
✅ The correct answer is option D.
2929. Coke made in narrower by-product coke ovens (as compared to wider ovens) is
Less reactive
Stronger
Smaller in size
All of the above
✅ The correct answer is option D.
2933. Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).
150
1500
3500
5000
✅ The correct answer is option B.
2936. The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
Fire point
Smoke point
Burning temperature
Kindling temperature
✅ The correct answer is option C.