Fuels and Combustion
Preheating of combustion air is done to

Reduce its requirement for effecting the complete combustion
Complete the combustion of fuel
Increase the adiabatic flame temperature
Increase the calorific value of the fuel

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Fuels and Combustion
Washing of coal

Improves its coking properties
Controls its ash fusibility and increases its calorific value
Reduces its sulphur and ash content
All of these

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Fuels and Combustion
Orsat apparatus is meant for

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

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