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Fuels and Combustion

Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

29
21
79
77

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Fuels and Combustion
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

Either lower or higher, depends on the type of fuel
Much higher
Much lower
Same

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

Aromatic compounds
Alphatic compounds
Olefins
Paraffins

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

Grindability
Weathering properties
Caking and swelling properties
Abradability

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Fuels and Combustion
During the carbonisation of coal

All of these
All tar is evolved at < 600°C
Evolution of H₂ and formation of methane and aromatics occur at > 700°C
Hard semi-coke starts shrinking at 600°C

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Fuels and Combustion
'Mixed gas' used in steel plants is a mixture of

Blast furnace gas and naphtha vapor
Coke oven gas and L.P.G
Coke oven gas and converter gas
F. gas and coke oven gas

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