Fuels and Combustion
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

None of these
Back draughting
Banking
Under pressurising

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

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

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