Fuels and Combustion
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Speed of combustion of fuel
Heat transfer rate to the stock in the furnace
Flame temperature achieved
Calorific value of the fuel

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Fuels and Combustion
Which of the following would require least amount of secondary air for combustion?

Bituminous coal containing 20% ash and 25% volatile matter
Semi-bituminous coal containing 25% ash and 20% volatile matter
Coke breeze containing 25% ash and 2% volatile matter
Anthracite containing 10% volatile matter and 8% ash

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