Fuels and Combustion
Orsat apparatus is meant for

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

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Fuels and Combustion
Sometimes water is sprayed during coal charging in the coke oven, which helps in

Controlling the dust nuisance while charging the coal
Prevention of clinker formation in the oven
All of these
Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)

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