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Fuels and Combustion

Fuels and Combustion
The cooling medium used in dry quenching of coke is

Carbon dioxide
Air
Nitrogen
Phenolic water

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Fuels and Combustion
Presence of nitrogen in combustion air does not reduce the

Flame temperature
Flue gas temperature
Amount of heat liberated
Any of the above

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Fuels and Combustion
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

145
85
70
105

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Fuels and Combustion
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the

Gas yield is less
Aromatic content of tar produced is more
Tar yield is more
Ignition temperature of coke produced is less

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Fuels and Combustion
Use of pulverised coal in boiler furnace provides

Smokeless burning
Better combustion
High calorific value
Less erosion on furnace walls

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Fuels and Combustion
Naphthalene is used for making

All of these
Drug intermediates e.g. β-naphthol
Unsaturated polyesters
Insecticides (e.g. moth balls)

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