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Fuels and Combustion

Fuels and Combustion
Coal tar (produced by high temperature carbonisation) is the main source of

Olefins
Aromatic compounds
Paraffins
Alphatic compounds

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Fuels and Combustion
Abrasion index of blast furnace coke should be around __________ percent.

80
35
55
20

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Fuels and Combustion
As the equilibrium moisture content of the coal increases, its

Bulk density decreases
Calorific value increases
Swelling number increases
Swelling number decreases

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Fuels and Combustion
Dry air required to burn 1 kg of carbon completely may be around __________ kg.

2
20
38
11

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Fuels and Combustion
Calorific value of of blast furnace gas is around __________ KCal/Nm³.

1800
6500
850
4200

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Fuels and Combustion
Use of excess of combustion air in the combustion of fuels results in

Condensation of water vapour from the fuel gas
Heat losses
Long flame
None of these

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