Fuels and Combustion
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?

Producer gas
Carburetted water gas
Liquified petroleum gas
Natural gas

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Fuels and Combustion
Froth floatation is used for

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

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