Very __________ coals are completely devoid of cokability i.e, it is non coking.

'Fat coals' are those coals which have very high

A

Caking capacity

B

Volatile matter content

C

Fusion point of its ash

D

Inherent moisture content

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

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

A

Delayed

B

Flexi

C

Fluid

D

Contact

Coking coals are invariably

A

Lignites

B

Bituminous coals

C

Semi-anthracites

D

Anthracites

Most of the coking coals are

A

Anthracite

B

Bituminous

C

Lignite

D

None of these

Which of the following petrographic constituents of coal is non-coking?

A

Durain

B

Vitrain

C

Clarain

D

Fussain

A good coking coal should have high __________ content.

A

Ash

B

Sulphur & phosphorus

C

Moisture

D

None of these

Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.

A

6

B

18

C

28

D

36

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

A

18

B

48

C

8

D

80

Volatile matter content in coking coal may be about __________ percent.

A

1

B

7

C

22

D

46

Very __________ coals are completely devoid of cokability i.e, it is non coking.

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