Furnace Technology
Artificial draught produced by a fan in the furnace can be controlled by the

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

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Furnace Technology
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Use of non-preheated combustion air
Use of excessive positive draft in the furnace
Use of pulverised solid fuels
Imperfect mixing of fuel & air and infiltration of air

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Furnace Technology
The reason for excessive clinker formation in gas producers is the

All of these
Use of fuel having too low an ash fusion temperature
Use of coal/coke containing a high % of fines and ash
Development of hot spots in the fuel bed and an abnormally high rate of gasification

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Furnace Technology
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Rate of firing and emissivity of flame
All of these
Nature of process ; whether batch, continuous or intermittant
Thermal conductivity of the charge & structural materials of furnace

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