By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

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 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 (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

During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

A

Density

B

Porosity

C

Electrical resistivity

D

None of these

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

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

A

100-150

B

350-450

C

700-850

D

550-650

Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?

A

Benzol

B

Ethylene

C

Pitch-cresosote mixture (PCM)

D

Naphthalene

By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

Related Questions