Fuels and Combustion
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

Decreases
Remains constant
May increase or decrease, depends on combustibles
Increases

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Fuels and Combustion
Froth floatation is used for

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

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