Is equal to the heat of formation
Is always negative
Can’t be known without calculating it
Is always positive
✅ The correct answer is option B.
Chemical Engineering MCQs
‘Mixed gas’ used in steel plants is a mixture of
B.F. gas and coke oven gas
Coke oven gas and converter gas
Coke oven gas and L.P.G
Blast furnace gas and naphtha vapor
✅ The correct answer is option A.
Coke compared to the coal from which it has been made, contains
Less volatile matter
More carbon
Greater percentage of ash
All of the above
✅ The correct answer is option D.
Purity of coke means that, it is high in carbon and low in
Volatiles
Ash
Iron
Moisture
✅ The correct answer is option A.
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
< 37%
>71%
In between 37 & 71%
None of these
✅ The correct answer is option C.
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
400-500
900-1000
1400-1500
1700-1800
✅ The correct answer is option B.
Assam coals suffers mainly from the disadvantage of high __________ content.
Ash
Volatile matter
Sulphur (4-6%)
Moisture
✅ The correct answer is option C.
With increase in the oxygen content of the coal, its __________ decreases.
Calorific value
Caking power
Both A & B
Neither A nor B
✅ The correct answer is option C.
A coal having higher volatile matter content will necessarily have lower
Ash fusion temperature
Calorific value
Ignition temperature
Caking index
✅ The correct answer is option C.
Which of the following bricks should not be used, if the furnace is to be used intermit-tantly ?
Firebricks
Silica bricks
Silicon carbide bricks
Sillimanite
✅ The correct answer is option B.