Fuels and Combustion
Preheating of __________ the flame temperature.

Either the fuel or the air does not affect
Combustion air decreases
Either the fuel or the air or both, increases
The gaseous fuel before combustion decreases

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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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