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Fuels and Combustion

Fuels and Combustion
A sooty flame can be made non-luminous by

Shutting gas supply
Admitting more air
Shutting air supply
Admitting more gas

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Fuels and Combustion
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its

All of these
Emissivity factor is higher
Sulphur content is lower
Flue gas has lower dew point thereby facilitating more waste heat recovery

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Fuels and Combustion
Which of the following is coking?

Vitrain
Neither A nor B
Both A & B
Fussain

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

79
77
21
29

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

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

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Fuels and Combustion
Which of the following fuels is the best for burning on chain grate stoker?

Non-caking coal
Pulverised coal
Coking coal
Caking coal

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