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Fuels and Combustion

Fuels and Combustion
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

950
1150
550
750

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

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

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Fuels and Combustion
Presence of nitrogen in combustion air does not reduce the

Flue gas temperature
Any of the above
Flame temperature
Amount of heat liberated

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Fuels and Combustion
Gross heating value of coal is __________ the net heating value.

None of these
Same as
Higher than
Lower than

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Fuels and Combustion
Volumetric ratio of N₂ to O₂ in dry atmospheric air is

0.79
3.76
4.76
0.21

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Fuels and Combustion
A coal with high __________ content, would ignite most easily.

Oxygen
Volatile matter
Fixed carbon
Ash

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