Fuels and Combustion
The function of secondary combustion air is to

Pneumatically convey the pulverised coal
Burn the lumpy coal
None of these
Completely burn the volatile matter

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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
A coking coal
Can be used for gasification and steam generation

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