Fuels and Combustion
Natural draught produced by a chimney depends upon the

Height of the chimney
Density of the chimney gases
Neither A nor B
Both A & B

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Fuels and Combustion
Froth floatation is used for

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

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