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Fuels and Combustion

Fuels and Combustion
High excess air in combustion of fuels results in

Incomplete combustion
Smoky flame
Increased fuel consumption
None of these

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Fuels and Combustion
Main constituents of purified Lurgi gas are

CO₂, O₂ & CO
H₂, CmHn & CO₂
CO, H₂ & CH₄
N₂, H₂ & CO₂

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Fuels and Combustion
Fuel combustion is never cent per cent efficient due to

Incomplete combustion
Dry gas/stack gas loss
All of these
Moisture loss

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Fuels and Combustion
For long flame and easy ignition, the coal used should have

High calorific value
High ash
High volatile matter
Low ash

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Fuels and Combustion
Assam coals suffers mainly from the disadvantage of high __________ content.

Sulphur (4-6%)
Ash
Moisture
Volatile matter

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Fuels and Combustion
Overfire burning in a furnace is a phenomenon characterised by the

Supply of excess fuel
Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air
Supply of excess air
None of these

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