Is not undersirable
Reduces its calorific value
Badly affects the quality of steel
Increases its caking power
✅ The correct answer is option C.
Chemical Engineering MCQs
The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be
Y
0.95 y
1.05 y
1.8 y
✅ The correct answer is option A.
Which of the following is used for making the explosive ‘TNT’?
Benzol
Toluene
Pyridine
Cerosote
✅ The correct answer is option B.
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.
The most matured coal out of the following is
Lignite
Semi-anthracite
Sub-bituminous
Bituminous
✅ The correct answer is option B.
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.
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.
Function of secondary air in pulverised coal firing is to
Transport the coal to the burner
Dry the coal
Ensure efficient burning of coal around the burner
Reduce primary air requirement
✅ The correct answer is option C.
High ash coals
Are soft & friable (poor strength and size stability)
Require longer time of carbonisation as ash offers resistance to heat transfer
Produce larger quantity of coke oven gas
None of these
✅ The correct answer is option B.
KOH solution used in orsat apparatus absorbs
CO₂
SO₂
Both A & B
Neither A nor B
✅ The correct answer is option C.