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Fuels and Combustion

Fuels and Combustion
Coking time in beehive coke oven is about

One week
2-3 days
12 hours
Two weeks

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Fuels and Combustion
Low temperature oxidation of stored coal results in the

Decrease in its caking power & calorific value
Increase in its oxygen content
All of these
Decrease in its carbon & hydrogen content

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Fuels and Combustion
Deficiency of combustion air during combustion of a gaseous fuel

Lengthens the flame
Both A & B
Shortens the flame
Causes heat loss of fuel by its partial combustion

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

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

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Fuels and Combustion
Main use of soft coke is as __________ fuel.

Blastfurnace
Foundary
None of these
Domestic

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Fuels and Combustion
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?

Ammonium nitrate
Ammonium sulphate
None of these
Ammonium phosphate

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