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Fuels and Combustion

Fuels and Combustion
A good quality coal should have

None of these
High ash content
Low fusion point of ash
High sulphur

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

Bituminous coal
Lignite
None of these
Anthracite coal

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Fuels and Combustion
Presence of free moisture in coal is most disadvantageous during

Its pulverisation (as it requires more power)
Handling (e.g. when emptying wagons)
Combustion of fire slacks on the grates
None of these

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Fuels and Combustion
Which of the following has the highest flame speed?

CH₄
CO
H₂
C₂H₆

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Fuels and Combustion
'Fat' coal means a coal having

Low ash content
Non smoking tendency
Low calorific value
High volatile matter

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Fuels and Combustion
For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

10
0.1
2
5

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