FUELS AND COMBUSTION QUIZ

Volumetric ratio of N₂ to O₂ in dry atmospheric air is

3.76

4.76

0.21

0.79

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of free moisture in coal is most disadvantageous during

None of these

Its pulverisation (as it requires more power)

Handling (e.g. when emptying wagons)

Combustion of fire slacks on the grates

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.

1000

4000

15000

8000

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not used as a binder in coal briquetting?

Pitch

Tar

Line

Molasses

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke oven gas constitutes mainly of

CH₄ & CO

H₂ & CH₄

H₂ & CO₂

H₂ & CO

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not endothermic?

Cracking

Partial oxidation

Reforming

Gasification

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of nitrogen in combustion air does not reduce the

Amount of heat liberated

Any of the above

Flue gas temperature

Flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Calorific value of the fuel

Speed of combustion of fuel

Heat transfer rate to the stock in the furnace

Flame temperature achieved

TRUE ANSWER : ?
YOUR ANSWER : ?

Dry air required to burn 1 kg of carbon completely may be around __________ kg.

11

38

20

2

TRUE ANSWER : ?
YOUR ANSWER : ?

In low temperature carbonisation of coal, the

Volatile matter in coke is zero

Yield of tar is about 3% of dry coal

Yield of coke oven gas is 290 Nm³ /ton dry coal

Temperature maintained is 700°C

TRUE ANSWER : ?
YOUR ANSWER : ?

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