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.Management Sciences
Category: Fuels and Combustion
Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?
A. Iron blast furnace
B. Cupola in foundries
C. Sinter making
D. Domestic ovens
(64-132) rank coal (ASTM) means a coal with 64%___________________?
A. Fixed carbon and having a heat value of 13, 200 BTU/1b
B. Ash and a heating value of 13, 200 BTU/1b
C. Fixed carbon and a heating value of 132 BTU/1b
D. None of these
Use of pulverised coal in boiler furnace provides___________________?
A. High calorific value
B. Better combustion
C. Smokeless burning
D. Less erosion on furnace walls
Main constituent of the gas produced from a gobar gas plant is___________________?
A. CO2
B. CH4
C. H2
D. CO
Blast furnace coke is made from coal by_____________________?
A. Low temperature carbonisation
B. High temperature carbonisation
C. Medium temperature carbonisation
D. Heating the coal in an oven in presence of air
When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?
A. Carbonisation
B. Oxidation
C. Coalification
D. Gasification
Undercharging of coal in the by-product coke ovens results in ____________________?
A. Decrease in the c.v. of coke oven gas
B. Increase in its throughput
C. Increase in the c.v. of coke oven gas
D. No change in the c.v. of coke oven gas
Main use of soft coke is as _______________ fuel?
A. Domestic
B. Blast furnace
C. Foundry
D. None of these
Spontaneous combustion of coal on storage results due to___________________?
A. Inadequate ventilation
B. Low temperature oxidation
C. Storage in large heaps with small surface to volume ratio
D. All A., B. and C.
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