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.Management Sciences
Category: Fuels and Combustion
Prime coking coal is always blended with medium or non- coking coal before carbonisation__________________?
A. To check against its excessive swelling during heating, which may exert high pressure and
damage coke oven walls
B. Because, it alone produces unreactive coke
C. Both A. and B.
D. Neither A. nor B.
Narrow coke ovens as compared to wider coke ovens_________________?
A. Produce smaller coke
B. Produce stronger coke
C. Require less time of carbonisation
D. All A., B. and C.
Laboratory gas is obtained by the cracking of____________________?
A. Gasoline
B. Diesel
C. Fuel oil
D. Kerosene
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?
A. Ammonium sulphate
B. Ammonium nitrate
C. Ammonium phosphate
D. None of these
Higher efficiency in the combustion of solid fuel cannot be achieved by________________?
A. Proper fuel preparation
B. Keeping the flue gas exhaust temperature very high
C. Adopting efficient-fuel firing technique & equipment
D. Supplying correct quantity of combustion air
In flue gas analysis by Orsat’s apparatus, oxygen is absorbed by____________________?
A. Potassium hydroxide
B. Cuprous chloride
C. Alkaline pyrogallol solution
D. None of these
The heat of combustion of a fuel___________________?
A. Is equal to the heat of formation
B. Is always negative
C. Can’t be known without calculating it
D. Is always positive
Volatile matter content of metallurgical coke may be around ______________ percent?
A. 1-2
B. 10-15
C. 22-26
D. 30-33
Higher percentage of ash in coal meant for the production of metallurgical grade coke ___________________?
A. Decreases the hardness of coke
B. Decreases the abrasion resistance of coke
C. Causes brittleness in steel
D. None of these
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the___________________?
A. Requirement of large volume combustion chamber
B. Risk of explosion
C. Chances of clinker formation
D. Incomplete combustion of coal
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