Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.

Narrow coke ovens as compared to wider coke ovens

A

Produce smaller coke

B

Produce stronger coke

C

Require less time of carbonisation

D

All of the above

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

Coke made in narrower by-product coke ovens (as compared to wider ovens) is

A

Less reactive

B

Stronger

C

Smaller in size

D

All of the above

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

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

Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.

A

30

B

300

C

3,000

D

30,000

Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.

A

Colour

B

Moisture content

C

Ash content

D

Volatile matter

Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.

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