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.Management Sciences
Category: Fuels and Combustion
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around ______________ Nm3?
A. 30
B. 300
C. 3,000
D. 30,000
Nitrogen in coal_________________?
A. Is present upto 1-2%
B. Comes from protein in parent vegetable matter
C. Is recovered as ammonia during its carbonisation
D. All A., B. and C.
In flue gas analysis by Orsat’s apparatus, carbon monoxide is absorbed by__________________?
A. Cuprous chloride
B. Potassium hydroxide
C. Alkaline pyrogallol solution
D. None of these
Pick out the wrong statement ?
A. Angle of repose of coal increases with its increasing size
B. Specific gravity of coal increases with its increasing maturity
C. Refractive index and reflectance of coal increases with the increasing rank of coal
D. Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H
ratio of coal
Which of the following gaseous fuels is likely to have the highest gross calorific value ?
A. Sewage gas
B. LPG
C. Producer gas
D. Natural gas
Coalification means the ___________________?
A. Process of conversion of lignite into anthracite
B. Underground gasification of coal
C. Complete combustion of coal
D. Direct hydrogenation of coal
Hard coke is manufactured from___________________?
A. Lignite
B. Bituminous coal
C. Semi-anthracite
D. Anthracite
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of__________________?
A. Less air for combustion
B. Correct amount of air for combustion
C. Too much air for combustion
D. Pulverised coal in boilers
Combustion of pulverised coal as compared to that of lump coal ________________?
A. Develops a non-luminous flame
B. Develops a low temperature flame
C. Can be done with less excess air
D. Provides a lower rate of heat release
Main constituents of purified Lurgi gas are___________________?
A. H2, CmHn & CO2
B. CO, H2 & CH4
C. CO2, O2 & CO
D. N2, H2 & CO2
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