Preheating, blending and de-ashing the coal
Stamped charging of coal
Dry quenching of coke
All of the above
✅ The correct answer is option D.
Chemical Engineering MCQs
Which of the following is not a binder for coal briquetting?
Coal tar
Bitumen
Molasses
None of these
✅ The correct answer is option D.
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.
Decreases
Increases
Remains constant
May increase or decrease, depends on combustibles
✅ The correct answer is option D.
Calorific value of bituminous coal may be around __________ Kcal/kg.
500
1500
6500
20000
✅ The correct answer is option C.
Quantity of coke produced from metallurgical coal may be around __________ percent.
30
50
75
95
✅ The correct answer is option C.
During combustion of coal on grate, clinker formation is increased by the
Use of thick fire bed
Low fusion point of ash (< 1100° C)
Use of preheated primary air
All of the above
✅ The correct answer is option D.
Increase in ash content of blast furnace coke
Reduces its consumption in the furnace
Increases its consumption in the furnace
Does not affect its consumption in the furnace
Decreases its hardness and abrasion resistance
✅ The correct answer is option B.
Abrasion index of blast furnace coke should be around __________ percent.
20
35
55
80
✅ The correct answer is option D.
If oxygen content in the flue gas rises too high, fuel is being wasted by
Incomplete combustion
Dry gas/stack gas loss
Moisture loss
None of these
✅ The correct answer is option B.
Coking time in beehive coke oven is about
12 hours
2-3 days
One week
Two weeks
✅ The correct answer is option B.