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.Management Sciences
Category: Fuels and Combustion
A coal with high _____________ content, would ignite most easily?
A. Fixed carbon
B. Volatile matter
C. Ash
D. Oxygen
Gross heating value of coal is ______________ the net heating value?
A. Higher than
B. Lower than
C. Same as
D. None of these
A coal with high ash content___________________?
A. Has higher calorific value
B. Is harder and stronger
C. Is not subjected to washing
D. Has low quantity of mineral matter
KOH solution used in Orsat apparatus absorbs____________________?
A. CO2
B. SO2
C. Both A. & B.
D. Neither A. nor B.
Assam (India) coals suffers mainly from the disadvantage of high ______________ content?
A. Ash
B. Volatile matter
C. Sulphur (4-6%)
D. Moisture
The gasification reaction represented by, C + H2O = CO + H2, is__________________?
A. Exothermic
B. Endothermic
C. Catalytic
D. Autocatalytic
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if __________________?
A. It contains large amount of volatile matter
B. It is stored in tall heaps
C. Smaller fines are stored in large quantity
D. All A., B. and C.
In low temperature carbonisation of coal as compared to high temperature carbonisation _____________ produced is less?
A. Difference in gross & net calorific value of the coke oven gas
B. Free carbon content in tar
C. Yield percentage of coke
D. Yield of ammonia present in coke oven gas
A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?
A. 21% excess air has been used for combustion
B. 21% excess oxygen has been used for combustion
C. Complete combustion of fuel has taken place
D. No excess air has been used for combustion
Preheating of coal charge for the coke ovens reduces the __________________?
A. Time of carbonisation
B. Yield of gas and tar
C. Fuel consumption in coking
D. All A., B. and C.
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