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Fuels and Combustion

Fuels and Combustion
The calorific value of producer gas is around __________ kcal/Nm³

4500
1300
500
9000

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Fuels and Combustion
With increase in the oxygen content of the coal, its __________ decreases.

Neither A nor B
Both A & B
Calorific value
Caking power

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Fuels and Combustion
Weathering of coal during storage causes

Increase in its friability
All of these
Reduction in coal size
Decrease in its caking capacity

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Fuels and Combustion
During combustion of gaseous fuels, deficiency of air

Does not affect the flame length
Lengthens the flame
Tends to shorten the flame
Increases the flame temperature

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

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

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Fuels and Combustion
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.

Carbon monoxide
Temperature
Oxygen
Smoke

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