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.Management Sciences
Category: Fuels and Combustion
Coke oven gas burns with a yellowish flame, because of the presence of __________________?
A. CO2
B. CH4
C. H2
D. NH3
The calorific value of L.D. converter gas is about ____________ Kcal/Nm3?
A. 1800
B. 800
C. 4500
D. 10000
Low temperature oxidation of stored coal results in the________________?
A. Decrease in its caking power & calorific value
B. Decrease in its carbon & hydrogen content
C. Increase in its oxygen content
D. All A., B. and A.
Purity of coke means that, it is high in carbon and low in __________________?
A. Volatiles
B. Ash
C. Iron
D. Moisture
C/H ratio is the minimum in case of_________________?
A. Furnace oil
B. Natural gas
C. Coal
D. Naphtha
Fussain _____________________?
A. Is friable, charcoal like substance
B. Has highest fixed carbon and lowest volatile matter content of all the four banded components
of coal
C. Is non-coking, but when blended with highly coking coal, controls its swelling and produces
high strength coke on carbonisation
D. All A., B. and C.
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of_______________?
A. Tar
B. Benzol
C. Ammonia
D. None of these
Nitrogen present in the flue gas is determined in the Orsat apparatus by absorbing it in_____________________?
A. KOH
B. Ammoniacal cuprous chloride
C. Pyrogallol solution
D. None of these
Artificial draught produced by a fan can be controlled by the___________________?
A. Speed of the fan
B. Damper
C. Variation in the pitch of the fan blades
D. All A., B. and C.
Coals used for the generation of producer gas should have ____________________?
A. High caking index
B. Low fusion point of ash
C. High volatile matter content
D. Very low ash content (8-10%)
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