FUELS AND COMBUSTION QUIZ

During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

Porosity

Density

Electrical resistivity

None of these

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YOUR ANSWER : ?

Anthracite coal

Is essentially a coking coal

Burns with short, bluish, yellow-tipped flame producing very little smoke

Ignites more easily than bituminous coal

Contains more volatile matter than bituminous coal

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YOUR ANSWER : ?

Gross calorific value will be equal to the net calorific value for

C₂H₂

H₂

C₂H₆

CO

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In high temperature carbonisation (as compared to low temperature carbonisation) of coal

Calorific value of coke oven gas is less

All of these

Coke oven gas yield is more

Tar yield is less but free carbon in tar is more

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YOUR ANSWER : ?

Which is the heaviest fuel gas out of the following?

Carburetted water gas

Blast furnace gas

Coke oven gas

Water gas

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Increase in ash content of blast furnace coke

Decreases its hardness and abrasion resistance

Does not affect its consumption in the furnace

Increases its consumption in the furnace

Reduces its consumption in the furnace

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YOUR ANSWER : ?

Low temperature oxidation of coal during storage does not decrease its

Calorific value

Oxygen content

Caking power

None of these

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Which of the following is not a by-product fuel?

Pitch

Refinery gas

Blast furnace gas

Petrol

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YOUR ANSWER : ?

Grindability index of a coal is 100. It implies that the

Power consumption in grinding the coal will be very high

Coal can be easily pulverised

Coal can be pulverised with great difficulty

Coal can't be pulverised

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YOUR ANSWER : ?

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

Shallow and small piles

Large heaps with small surface to volume ratio

Closed space without any ventilation facility

Fine sizes without the presence of any lump

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