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Fuels and Combustion

Fuels and Combustion
One kg of carbon for theoretically complete combustion requires __________ kg of air.

11.5
12
23
0.5

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Fuels and Combustion
Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ?

Blast furnace coke
Sub-bituminous coal
Anthracite coal
Low temperature coke

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Fuels and Combustion
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

Colour of
Temperature of
% of O₂in
%of CO₂ in

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Fuels and Combustion
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.

65
30
180
120

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Fuels and Combustion
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

All of these
It is stored in tall heaps
Smaller fines are stored in large quantity
It contains large amount of volatile matter

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Fuels and Combustion
Coalification means the

Underground gasification of coal
Process of conversion of lignite into anthracite
Direct hydrogenation of coal
Complete combustion of coal

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