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

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

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Fuels and Combustion
A good metallurgical coke

Should be brittle
Should have high porosity
Must contain moderate quantities of ash, moisture, sulphur and volatile matters
Should have low fusion point of its ash

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