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Fuels and Combustion

Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

96
40
4
20

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Fuels and Combustion
Softening temperature of coal ash is a measure of the __________ of coal.

Size stability
Clinkering tendency
Caking tendency
Coking tendency

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Fuels and Combustion
Artificial draught produced by a fan can be controlled by the

Damper
Speed of the fan
Variation in the pitch of the fan blades
All of these

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Fuels and Combustion
Which of the following is a poisonous fuel gas?

Blast furnace gas
Coke oven gas
Natural gas
None of these

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Fuels and Combustion
Bunsen burner is an example of a/an __________ burner.

Rotary cup
Inside mixing/premix type
Submerged combustion
Outside mixing/diffusion flame/nozzle mix type

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Fuels and Combustion
The heat of combustion of a fuel

Is always positive
Is always negative
Can't be known without calculating it
Is equal to the heat of formation

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