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

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

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Fuels and Combustion
Anthracite can be used for

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

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