Density of the chimney gases
Height of the chimney
Both A & B
Neither A nor B
✅ The correct answer is option C.
Fuel and Combustion MCQs
Which of the following is not endothermic?
Cracking
Reforming
Gasification
Partial oxidation
✅ The correct answer is option D.
In high temperature carbonisation of coal compared to low temperature carbonisation
Yield of ammonia is less
Aromatic content of tar is low
H₂ content in the coke oven gas is more
Calorific value of the coke oven gas is lower
✅ The correct answer is option C.
Calorific value of dry wood may be around __________ Kcal/kg.
5
50
500
5000
✅ The correct answer is option A.
Fuel consumption in coke making can be reduced by
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.
Which of the following is not a binder for coal briquetting?
Coal tar
Bitumen
Molasses
None of these
✅ The correct answer is option D.
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.
Which of the following combustibles is absent in blast furnace gas?
H₂
CH₄
CO
None of these
✅ The correct answer is option B.
Calorific value of wood gas is about __________ kcal/Nm³.
1500
3300
5400
8500
✅ The correct answer is option B.