Preheating of coal charge for the coke ovens reduces the

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

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

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

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

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

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

A

Through a metallic wall

B

By direct contact of hot flue gas with air

C

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

D

None of these

Compound coke ovens are those which can be heated by

A

Both steam and electrical power

B

Lean gas (e.g., B.F. gas)

C

Rich gas (e.g., coke oven gas)

D

Both B and C

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

A

18

B

48

C

8

D

80

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

Coke ovens in steel plant are heated by

A

Electricity

B

Coke oven gas

C

Mixed gas

D

Both B & C

Preheating of coal charge for the coke ovens reduces the

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