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

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

A

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

B

Free carbon content in tar

C

Yield percentage of coke

D

Yield of ammonia present in coke oven gas

Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

A

Higher calorific value

B

Lower hydrogen content

C

Both A & B

D

Neither A nor B

In high temperature carbonisation of coal compared to low temperature carbonisation

A

Yield of ammonia is less

B

Aromatic content of tar is low

C

H₂ content in the coke oven gas is more

D

Calorific value of the coke oven gas is lower

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

A

Coke oven gas yield is more

B

Tar yield is less but free carbon in tar is more

C

Calorific value of coke oven gas is less

D

All of the above

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

A

Ammonia yield is more

B

Aliphatic tar is produced

C

Free carbon in tar is more

D

All of the above

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

A

Gas yield is less

B

Tar yield is more

C

Ignition temperature of coke produced is less

D

Aromatic content of tar produced is more

Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

A

To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls

B

Because, it alone produces unreactive coke

C

Both A & B

D

Neither A nor B

While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at

A

Dankuni (West Bengal)

B

Dhanbad

C

Singreni (A.P.)

D

Raniganj

The coking process normally mostly used in Indian oil refineries is the __________ coking process.

A

Delayed

B

Flexi

C

Fluid

D

Contact

Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

A

10 & 3

B

3 & 10

C

15 & 8

D

10 & 20

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

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