Fuels and Combustion
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?

Producer gas
Natural gas
Water gas
Blast furnace gas

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Fuels and Combustion
Fixed carbon in coal is defined as

The one which is present in the residue after combustion
The total quantity of carbon present in the coal
Hundred minus the percentage of volatile matter, ash and moisture
That present in volatile matters

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Fuels and Combustion
Lignite is

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

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