Fuels and Combustion
Which of the following is unsuitable fuel for producer gas manufacture?

Coke
Anthracite
Coal having high fusion point of its ash
Coal having low fusion point of its ash

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

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

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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
High sulphur content in the fuel
Lack of thorough mixing of fuel with air
Low calorific value of the fuel

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