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Fuels and Combustion

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

Aanthracite
Bituminous coal
Semi-bituminous coal
Coke

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Fuels and Combustion
The main advantage of forced draft over natural draft is that

Furnace control is easier
All of these
Combustion of fuel is complete
Smaller height chimney can be used

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Fuels and Combustion
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.

160
750
60
500

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Fuels and Combustion
Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the

Decolourisation of sugar
Absorption of gases and vapor
Electrode manufacture
Solvent recovery from air and gases

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Fuels and Combustion
Coal containing large quantity of __________ are difficult to wash.

Ash
Free impurities
Inherent mineral matter
Volatile matter

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Fuels and Combustion
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is

0
10
12.5
20

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