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Fuels and Combustion

Fuels and Combustion
Caking index of a coal is a measure of its

Porosity
Abradability
Reactivity
Agglutinating (binding) properties

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

All of these
Coke oven gas yield is more
Tar yield is less but free carbon in tar is more
Calorific value of coke oven gas is less

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Fuels and Combustion
Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.

36
28
6
18

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Fuels and Combustion
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the

Steel ladle drying
Coke oven battery heating
Mixing with blast furnace gas
Hot scarfing of steel slabs

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Fuels and Combustion
Calorific value of wood gas is about __________ kcal/Nm³.

3300
8500
5400
1500

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Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

40
20
4
96

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