Fuels and Combustion
In low temperature carbonisation (as compared to high temperature carbonisation) of coal

All of these
Free carbon in tar is more
Ammonia yield is more
Aliphatic tar is produced

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Fuels and Combustion
Fussain

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

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Fuels and Combustion
Combustion of pulverised fuel

All of these
Requires larger combustion chamber than rich gaseous fuel
In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Suppresses the discharge of fine dust and grit into atmosphere

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