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Fuels and Combustion

Fuels and Combustion
A good coking coal should have high __________ content.

Ash
None of these
Sulphur & phosphorus
Moisture

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

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

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Fuels and Combustion
Use of excess of combustion air in the combustion of fuels results in

Long flame
Condensation of water vapour from the fuel gas
None of these
Heat losses

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Fuels and Combustion
High temperature in gasification of coal favours

Both B and C
Low production of CO₂
High production of CO
High production of CO₂

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Fuels and Combustion
Caking index of the coal blend used for the manufacture of metallurgical coke should be around

5
21
48
40

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Fuels and Combustion
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Higher C/H ratio
Difference in gross & net calorific value
Calorific value
Sulphur content

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