Fuels and Combustion
Preheating of __________ the flame temperature.

Either the fuel or the air does not affect
Combustion air decreases
Either the fuel or the air or both, increases
The gaseous fuel before combustion decreases

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

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)
Controlling the dust nuisance while charging the coal
Prevention of clinker formation in the oven

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Fuels and Combustion
Lignite is

A high rank coal
A black banded coal which burns with a non-smoky yellowish flame
Can be used for gasification and steam generation
A coking coal

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