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

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

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Fuels and Combustion
The weathering index of a coal

Gives an idea of the fusion temperature of ash
Is a measure of its size stability, when stored & exposed to weather
Is related to its calorific value
Is a measure of its caking tendency

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