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Fuels and Combustion

Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

96
20
4
40

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Fuels and Combustion
Coal tar (produced by high temperature carbonisation) is the main source of

Aromatic compounds
Alphatic compounds
Paraffins
Olefins

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Fuels and Combustion
Deficiency of combustion air during combustion of a gaseous fuel

Both A & B
Shortens the flame
Lengthens the flame
Causes heat loss of fuel by its partial combustion

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Fuels and Combustion
Percentage of methane in coke oven gas may be around

15
5
25
50

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Fuels and Combustion
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

47.3
27.6
23
42.9

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Fuels and Combustion
The calorific value is the highest out of the following for

Producer gas
Coke oven gas
Water gas
Blast furnace gas

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