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Fuels and Combustion

Fuels and Combustion
'Fuel' can be defined as a substance which produces heat by

Nuclear fission
Combustion
Nuclear fusion
All of these

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Fuels and Combustion
Which of the following petrographic constituents of coal is non-coking?

Durain
Fussain
Vitrain
Clarain

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Fuels and Combustion
Combustion of pulverised coal compared to the lumpy coal

Provides higher thermal efficiency & flame temperature
All of these
Provides better control of furnace temperature
Facilitates combustion with lower excess air

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Fuels and Combustion
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

Excessive fly-ash discharge from the stack
High power consumption in its transportation
Erosion of induced draft fan blades
Ash disposal problem

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Fuels and Combustion
Presence of phosphorous in metallurgical coal

Is not undersirable
Reduces its calorific value
Badly affects the quality of steel
Increases its caking power

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Fuels and Combustion
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

55 to 75
15 to 25
75
35 to 45

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