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Fuels and Combustion

Fuels and Combustion
Caking coal is desirable for

Burning on travelling grate
Coke making
All of these
Burning on firebars

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Fuels and Combustion
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

1150
950
750
550

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Fuels and Combustion
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of

Blast furnace gas
Water gas
Natural gas
Coke oven gas

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Fuels and Combustion
Adiabatic flame temperature of a fuel is dependent on the initial temperature of

Air
Both A & B
Neither A nor B
Fuel

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Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

77
21
79
29

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Fuels and Combustion
Presence of free moisture in coal is most disadvantageous during

None of these
Handling (e.g. when emptying wagons)
Combustion of fire slacks on the grates
Its pulverisation (as it requires more power)

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