Fuels and Combustion
The maximum adiabatic flame temperature is attained, when the fuel is burnt with

Less than theoretically required amount of air
More than theoretically required amount of air
Theoretically required amount of oxygen
Theoretically required amount of air

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Fuels and Combustion
Lignite is

Can be used for gasification and steam generation
A coking coal
A high rank coal
A black banded coal which burns with a non-smoky yellowish flame

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