Coking time in narrow by-product coke ovens is around __________ hours.

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 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

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

A

2.5

B

0.5

C

10

D

20

Flue gas from the heating chamber of byproduct coke ovens is removed by

A

Forced draft fan

B

Induced draft fan

C

Steam ejector

D

Natural draft

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

A

Delayed

B

Flexi

C

Fluid

D

Contact

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

Beehive coke ovens are made of __________ bricks.

A

Silica

B

Fireclay

C

Silicon carbide

D

Corundum

Coking time in beehive coke oven is about

A

12 hours

B

2-3 days

C

One week

D

Two weeks

Undercharging of coal in the by-product coke ovens results in

A

Decrease in the c.v. of coke oven gas

B

Increase in its throughput

C

Increase in the c.v. of coke oven gas

D

No change in the c.v. of coke oven gas

High rate of heating of coke ovens

A

May damage its walls due to abrupt excessive swelling of coal

B

Produces larger size coke

C

Increases the time of carbonisation

D

None of these

Coking time in narrow by-product coke ovens is around __________ hours.

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