Fuels and Combustion
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

Pitch
Pulverised coke
Coke oven gas
Tar

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Fuels and Combustion
Anthracite coal

Burns with short, bluish, yellow-tipped flame producing very little smoke
Ignites more easily than bituminous coal
Is essentially a coking coal
Contains more volatile matter than bituminous coal

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Fuels and Combustion
Froth floatation is used for

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
Washing lump coal (> 80 mm size)

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