Most of the coking coals are

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

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

A

Young

B

Mature

C

Both A & B

D

Neither A nor B

Coking coals are invariably

A

Lignites

B

Bituminous coals

C

Semi-anthracites

D

Anthracites

'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

Which is the most ideal feed stock for 'coking' process used for the manufacture of petroleum coke?

A

Naphtha

B

Vacuum residue

C

Light gas oil

D

Diesel

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 beehive coke oven is about

A

12 hours

B

2-3 days

C

One week

D

Two weeks

During coking of coal, the ash content (percentage)

A

Increases

B

Decreases

C

Remains constant

D

None of these

Most of the coking coals are

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