The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.

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

High temperature carbonisation of coal takes place at __________ °C.

A

2000

B

700

C

1100

Low temperature carbonisation of coal takes place at __________ °C.

A

300

B

1100

C

700

D

900

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

Presence of free moisture in coal during its high temperature carbonisation

A

protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

B

reduces the coking time

C

increases the loss of fine coal dust from the ovens when charging

D

none of these

The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.

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