FUELS AND COMBUSTION QUIZ

Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

5

55

25

75

TRUE ANSWER : ?
YOUR ANSWER : ?

Ratio of primary air to secondary air increases with increase in the rank of coal, because the

High rank coals have higher amount of volatile matter

Oxygen content progressively decreases

Calorific value of the coal increases

Ratio of fixed carbon to volatile matter increases

TRUE ANSWER : ?
YOUR ANSWER : ?

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

All of these

Coke oven gas yield is more

Calorific value of coke oven gas is less

Tar yield is less but free carbon in tar is more

TRUE ANSWER : ?
YOUR ANSWER : ?

Low temperature carbonisation of coal produces

Metallurgical coke

Soft coke

Very low calorific value coke oven gas

No by-products

TRUE ANSWER : ?
YOUR ANSWER : ?

Insitu theory and drift theory are related to the

Coalification

Variation of coal quality with depth

Origin of coal

Origin of petroleum oil

TRUE ANSWER : ?
YOUR ANSWER : ?

Short/intense flame is produced during combustion of gaseous fuel by using

Preheated secondary air

Very little excess air

High amount/current of combustion air

Low amount/current of combustion air

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a binder for coal briquetting?

Bitumen

Coal tar

Molasses

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

N₂

H₂

CO₂

CH₄

TRUE ANSWER : ?
YOUR ANSWER : ?

Volumetric ratio of N₂ to O₂ in dry atmospheric air is

0.79

4.76

3.76

0.21

TRUE ANSWER : ?
YOUR ANSWER : ?

In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.

Free carbon content in tar

Yield percentage of coke

Difference in gross & net calorific value of the coke oven gas

Yield of ammonia present in coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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