Fuels and Combustion
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of

Blast furnace gas
Natural gas
Water gas
Coke oven gas

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Fuels and Combustion
Orsat apparatus is meant for

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

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