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

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Fuels and Combustion
Anthracite can be used for

Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke
Making carbon electrodes
Recarbonising steel
All of these

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