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Fuels and Combustion

Fuels and Combustion
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

1
2
4
6

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Fuels and Combustion
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1400
1100
1250
1350

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Fuels and Combustion
Fuel consumption in coke making can be reduced by

Dry quenching of coke
Stamped charging of coal
Preheating, blending and de-ashing the coal
All of these

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Fuels and Combustion
Increase in ash content of blast furnace coke

Reduces its consumption in the furnace
Increases its consumption in the furnace
Does not affect its consumption in the furnace
Decreases its hardness and abrasion resistance

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Fuels and Combustion
Which of the following fuel gases has the highest calorific value ?

Liquefied petroleum gas (LPG)
Coal bed methane (CBM)
Natural gas
Sewage gas

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Fuels and Combustion
Which will have the least volatile matter and hence will be the most difficult to ignite?

Semi-bituminous coal
Bituminous coal
Coke
Aanthracite

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