3467. Which of the following is not a binder for coal briquetting?
Coal tar
Bitumen
Molasses
None of these
✅ The correct answer is option D.
3472. 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.
3477. Calorific value of wood gas is about __________ kcal/Nm³.
1500
3300
5400
8500
✅ The correct answer is option B.
3482. Weathering of coal during storage causes
Reduction in coal size
Increase in its friability
Decrease in its caking capacity
All of the above
✅ The correct answer is option D.
3448. Which of the following has the highest flame speed?
CO
H₂
CH₄
C₂H₆
✅ The correct answer is option B.
3452. Use of preheated air for combustion of fuel in the furnace, increases the
Scale losses of the furnace stock
Calorific value of the fuel
Flame temperature
None of these
✅ The correct answer is option C.
3457. Micum Index of a coke is a measure of its
Reactivity
Porosity
Bulk density
Hardness & strength
✅ The correct answer is option D.
3462. Which of the following would require maximum amount of % excess air for complete combustion?
Coke oven gas
Furnace oil
Pulverised coal
Lump coal (fixed on chain grate)
✅ The correct answer is option D.
3465. Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.
1800
3200
5400
10200
✅ The correct answer is option C.
3470. Quantity of coke produced from metallurgical coal may be around __________ percent.
30
50
75
95
✅ The correct answer is option C.