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Fuels and Combustion

Fuels and Combustion
Abrasion index of blast furnace coke should be around __________ percent.

20
55
35
80

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

12
11.5
0.5
23

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

Temperature of
% of O₂in
%of CO₂ in
Colour of

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Fuels and Combustion
Cannel coal and boghead coal are the examples of

None of these
Humic coals
Sapropelic coals
Liptobiolites

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Fuels and Combustion
Calorific value as determined by bomb calorimeter is the

Lower calorific value at constant pressure
Higher calorific value at constant volume
Gross calorific value at constant pressure
Net calorific value at constant volume

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Fuels and Combustion
Height of coke oven is limited (say maximum upto 7 metres) mainly by the

Problem of uniform heating along its height
Buckling of ram of pusher car at the time of coke pushing
Problem in door cleaning
Structural strength of silica bricks

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