Fuels and Combustion
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

Latent
Sensible
Sensible and latent
None of these

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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)
All of these
Removing ash from the coal based on difference in specific gravity of coal and ash

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