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.Management Sciences
Category: Fuels and Combustion
During its calorific value determination by bomb calorimeter, coal is combusted by _________________?
0
A. Air
B. Oxygen
C. Oxygen enriched air
D. None of these
The difference between total carbon and fixed carbon of coal will be minimum in case of___________________?
A. Lignite
B. Bituminous coal
C. Anthracite
D. High temperature coke (V.M < 0.5%)
Fuel for a fast breeder nuclear reactor is____________________?
A. Plutonium
B. Uranium
C. Radium
D. Neptunium
Removal of hydrogen from coke oven gas ___________________?
A. Increases its calorific value
B. Decreases its calorific value
C. Does not alter its calorific value
D. Is not possible on commercial scale
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be_________________?
A. More
B. Less
C. Same
D. Data insufficient; can’t be predicted
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?
A. Caking index
B. Yield of carbonised products
C. Friability & oxygen content
D. Calorific value
As the equilibrium moisture content of the coal increases, its___________________?
A. Calorific value increases
B. Swelling number decreases
C. Swelling number increases
D. Bulk density decreases
Coke ovens in steel plant are heated by ___________________?
A. Electricity
B. Coke oven gas
C. Mixed gas
D. Both B. & C.
Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?
A. Colour
B. Moisture content
C. Ash content
D. Volatile matter
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