Fuels and Combustion
Actual flame temperature is always lower than the adiabatic flame temperature, because there is

No possibility of obtaining complete combustion at high temperature
Neither A nor B
Always loss of heat from the flame
Both A & B

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Fuels and Combustion
Lignite is

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

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