Fuels and Combustion
Presence of nitrogen in combustion air does not reduce the

Flue gas temperature
Amount of heat liberated
Any of the above
Flame temperature

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Fuels and Combustion
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

High rank coals have higher amount of volatile matter
Oxygen content progressively decreases
Ratio of fixed carbon to volatile matter increases
Calorific value of the coal increases

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