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Fuels and Combustion

Fuels and Combustion
Which of the following constituents of coal is the most important in the production of coke?

Moisture
Carbon
Ash
Volatiles

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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
Heat transfer rate to the stock in the furnace
Flame temperature achieved

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Fuels and Combustion
Calorific value of wood gas is about __________ kcal/Nm³.

3300
1500
8500
5400

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Fuels and Combustion
Which of the following would require maximum amount of % excess air for complete combustion?

Furnace oil
Lump coal (fixed on chain grate)
Coke oven gas
Pulverised coal

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Fuels and Combustion
A coal having higher volatile matter content will necessarily have lower

Caking index
Ignition temperature
Ash fusion temperature
Calorific value

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Fuels and Combustion
__________ is used as jet engine fuel.

Petrol
Diesel
Kerosene
LPG

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