Fuels and Combustion
The heat of combustion of a fuel

Is always positive
Can't be known without calculating it
Is always negative
Is equal to the heat of formation

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Fuels and Combustion
Beehive coke oven

Produces coke with very poor strength
Gives larger yield of coke (around 85%) as compared to by-product ovens
Takes 2-3 days for coking of coal but requires no external fuel for heating
Facilitates by-products recovery

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Fuels and Combustion
Orsat apparatus is meant for

None of these
Gravimetric analysis of flue gas
Finding out combustion efficiency
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

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