Fuels and Combustion
The main advantage of forced draft over natural draft is that

Furnace control is easier
All of these
Combustion of fuel is complete
Smaller height chimney can be used

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Fuels and Combustion
Froth floatation is used for

Washing lump coal (> 80 mm size)
Washing fine coal dust (< 0.5 mm size)
Removing ash from the coal based on difference in specific gravity of coal and ash
All of these

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Fuels and Combustion
Combustion of pulverised fuel

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

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