Fuels and Combustion
Artificial draught produced by a fan can be controlled by the

Speed of the fan
Variation in the pitch of the fan blades
Damper
All of these

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Fuels and Combustion
Low temperature carbonisation

Is meant for the production of 'metallurgical coke'
Produces less quantity of tar than high temperature carbonisation
Produces higher quantity of gas than high temperature carbonisation
Is mainly for producing the smokeless domestic coke

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