Fuels and Combustion
Use of preheated air for combustion of fuel in the furnace, increases the

None of these
Calorific value of the fuel
Flame temperature
Scale losses of the furnace stock

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Fuels and Combustion
Fussain

Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is friable, charcoal like substance
All of these
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation

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