FUELS AND COMBUSTION QUIZ

Origin of coal

Variation of coal quality with depth

Coalification

Origin of petroleum oil

CO₂, O₂ & CO

H₂, CmHn & CO₂

N₂, H₂ & CO₂

CO, H₂ & CH₄

Carbon monoxide

Methane

Acetylene

Hydrogen

None of these

Increase in its strength

Brittleness of steel made by using it

Decrease in its calorific value

Neither A nor B

The ratio of its percentage of fixed carbon to that of volatile matter

Both A and B

Helpful in estimation of its rank

All of these

Produce stronger coke

Require less time of carbonisation

Produce smaller coke

None of these

Remains constant

Decreases

Increases

Both A & B

Higher amount of both methane and hydrogen

Higher amount of methane

Lower amount of hydrogen

Much lower

Much higher

Same

Either lower or higher, depends on the type of fuel

Produce strong coke

May damage the coke oven walls during carbonisation

Produce weak coke

Both B and C