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Fuels and Combustion

Fuels and Combustion
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³.

6500
10000
4000
2500

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Fuels and Combustion
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.

Type (solid, liquid or gaseous)
Sulphur content
Calorific value
Ignition temperature

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Fuels and Combustion
The internal energy of the combustion products is __________ compared to that of reactants.

Less
Equal
More or less ; (depends on the state of fuel.)
More

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Fuels and Combustion
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.

120
65
30
180

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Fuels and Combustion
Presence of phosphorous in metallurgical coal

Increases its caking power
Is not undersirable
Badly affects the quality of steel
Reduces its calorific value

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Fuels and Combustion
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

None of these
Carbonisation
Hydrogenation
Gasification

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