FUELS AND COMBUSTION QUIZ

Actual flame temperature is always lower than the adiabatic flame temperature, because there is

Neither A nor B

No possibility of obtaining complete combustion at high temperature

Both A & B

Always loss of heat from the flame

TRUE ANSWER : ?
YOUR ANSWER : ?

Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.

1kg mole

32 kg

22.4 Nm³

All of these

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A coal containing very high percentage of durain is called __________ coal.

Bright

Boghead

Non-banded

Splint

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'Mixed gas' used in steel plants is a mixture of

Coke oven gas and L.P.G

Coke oven gas and converter gas

F. gas and coke oven gas

Blast furnace gas and naphtha vapor

TRUE ANSWER : ?
YOUR ANSWER : ?

Preheating of coal charge for the coke ovens reduces the

Time of carbonisation

Fuel consumption in coking

All of these

Yield of gas and tar

TRUE ANSWER : ?
YOUR ANSWER : ?

As time passes, the calorific value of stored coal

Increases

May increase or decrease (depends on the method of storage)

Decreases

Remains unaltered

TRUE ANSWER : ?
YOUR ANSWER : ?

Lignite is

A high rank coal

A black banded coal which burns with a non-smoky yellowish flame

A coking coal

Can be used for gasification and steam generation

TRUE ANSWER : ?
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Mineral matter content (M) and ash content (A) in coal are approximately related as

M = A

M = 2A

M = 1.5A

M = 1.1A

TRUE ANSWER : ?
YOUR ANSWER : ?

For maximum discharge through a chimney, its height should be

Equal to the height of the hot gas column producing draught

More than 105.7 metres

Infinitely long

200 meters

TRUE ANSWER : ?
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High excess air in combustion of fuels results in

Smoky flame

Increased fuel consumption

Incomplete combustion

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?