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Fuels and Combustion

Fuels and Combustion
Which is the heaviest fuel gas out of the following?

Blast furnace gas
Water gas
Coke oven gas
Carburetted water gas

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Fuels and Combustion
Which of the following fuel gases is heavier than air?

Coke oven gas
Water gas
Blast furnace gas
Natural gas

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Fuels and Combustion
Preheating of __________ the flame temperature.

Combustion air decreases
Either the fuel or the air or both, increases
The gaseous fuel before combustion decreases
Either the fuel or the air does not affect

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Fuels and Combustion
The main advantage of forced draft over natural draft is that

Furnace control is easier
Combustion of fuel is complete
All of these
Smaller height chimney can be used

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Fuels and Combustion
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

Hydrocyclones
Wet scrubber
Bag filter
Multicyclones

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Fuels and Combustion
Which of the following can be made into briquettes without the use of a binder?

None of these
Bituminous coal
Anthracite coal
Lignite

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