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Fuels and Combustion

Fuels and Combustion
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

50
10000
5000
1000

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Fuels and Combustion
Power alcohol as compared to straight run gasoline has lower

Viscosity
Specific gravity
Calorific value
Octane number

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Fuels and Combustion
Low temperature oxidation of coal during storage does not decrease its

Oxygen content
Caking power
Calorific value
None of these

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Fuels and Combustion
Highly caking coals

Produce strong coke
Both B and C
May damage the coke oven walls during carbonisation
Produce weak coke

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Fuels and Combustion
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

Chances of clinker formation
Risk of explosion
Incomplete combustion of coal
Requirement of large volume combustion chamber

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

CH₄
C₂H₆
H₂
CO

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