Fuels and Combustion
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

1400-1500
400-500
900-1000
1700-1800

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Fuels and Combustion
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Presence of large quantity of hydrogen in the fuel
Low calorific value of the fuel
High sulphur content in the fuel
Lack of thorough mixing of fuel with air

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Fuels and Combustion
With increase in the temperature of carbonisation of coal

Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content
Methane content in the coke oven gas decreases and carbon monoxide content increases
All of these

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