FUELS AND COMBUSTION QUIZ

Blast furnace gas burns with a bluish flame, because of the presence of

S

CH₄

CO₂

CO

TRUE ANSWER : ?
YOUR ANSWER : ?

Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.

18

36

28

6

TRUE ANSWER : ?
YOUR ANSWER : ?

Gross heating value of coal is __________ the net heating value.

Lower than

Same as

None of these

Higher than

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YOUR ANSWER : ?

Which is the heaviest fuel gas out of the following?

Blast furnace gas

Carburetted water gas

Water gas

Coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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

22.4 Nm³

32 kg

All of these

1kg mole

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YOUR ANSWER : ?

A good quality coal should have

High ash content

High sulphur

None of these

Low fusion point of ash

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YOUR ANSWER : ?

Stack (chimney) height in a big thermal power plant is dictated by the

Draught to be created

Pollution control aspect

Limitation of constructional facilities

None of these

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In general, the limit of inflammability/explosion limit of fuel gases is widened by the

All of these

Increase in temperature (i.e. preheating)

Increase in gas pressure

Use of pure oxygen for combustion instead of air

TRUE ANSWER : ?
YOUR ANSWER : ?

Purity of coke means that, it is high in carbon and low in

Ash

Volatiles

Iron

Moisture

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YOUR ANSWER : ?

Coke oven gas is a better fuel than blast furnace gas, because of its higher

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

Heat release rate (thus requiring smaller combustion chamber)

All of these

Adiabatic flame temperature

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