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Fuels and Combustion

Fuels and Combustion
Blast furnace gas constitutes mainly of

N₂ & H₂
N₂ & CO
CH₄ & CO₂
N₂ & CH₄

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Fuels and Combustion
Laboratory gas is obtained by the cracking of

Kerosene
Diesel
Fuel oil
Gasoline

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Fuels and Combustion
During combustion of gaseous fuels, deficiency of air

Does not affect the flame length
Tends to shorten the flame
Lengthens the flame
Increases the flame temperature

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Fuels and Combustion
Which of the following would require maximum amount of % excess air for complete combustion?

Pulverised coal
Coke oven gas
Furnace oil
Lump coal (fixed on chain grate)

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Fuels and Combustion
Gray-King Assay and Roga Index of coal is a measure of its

Grindability
Weathering properties
Abradability
Caking and swelling properties

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Fuels and Combustion
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will

Increase
Decrease
Increase or decrease depending on the fuel type
Not change

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