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Fuels and Combustion

Fuels and Combustion
Producer gas comprises mainly of

CO & H₂
CO₂ & H₂
CO & N₂
CO₂ & N₂

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Fuels and Combustion
The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be

1.05 y
0.95 y
Y
1.8 y

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Fuels and Combustion
Compound coke ovens are those which can be heated by

Rich gas (e.g., coke oven gas)
Both B and C
Both steam and electrical power
Lean gas (e.g., B.F. gas)

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Fuels and Combustion
Natural draft created by the chimney depends upon

Both A & B
Its height
Temperature of the flue gas
Neither A nor B

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Fuels and Combustion
During coking of coal, the ash content (percentage)

None of these
Decreases
Remains constant
Increases

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Fuels and Combustion
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Difference in gross & net calorific value
Calorific value
Higher C/H ratio
Sulphur content

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