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

A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

A

Is less liable to spontaneous combustion on storage

B

Is more difficult to ignite and produces a shorter flame

C

Requires smaller combustion space and less secondary air

D

None of these

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

Consider the following problems being faced by the Indian Coal Industry :
I. Poor quality of coal and bottlenecks in the coal movement
II. Low utilisation capacity of washeries
III. Growing dependence on the import of coking coal
IV. Administered prices

A

II, III and IV

B

I, II, III and IV

C

I, III and IV

D

I, II and III

Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.

A

6

B

12

C

18

D

24

Which of the following statement (s) regarding India's coal reserves is/are true ?
I. Over 90% of total reserves are located in the valleys of Son, Damodar, Mahanadi and Godavari
II. Indian coal reserves are characterised by low ash content and high calorific value
III. India has limited prime coking reserves

A

I only

B

I and III

C

II and III

D

I, II and III

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

A

Delayed

B

Flexi

C

Fluid

D

Contact

Volatile matter content of metallurgical coke may be around __________ percent.

A

1-2

B

10-15

C

22-26

D

30-33

A good coking coal should have high __________ content.

A

Ash

B

Sulphur & phosphorus

C

Moisture

D

None of these

Determination of volatile matter in coal, during its proxiinate analysis requires heating of coal sample.

A

weighing 25 gins (as received basis) in a muffle furnace

B

in a platinum crucible

C

weighing 1 gms (air dried)

D

in a fuel oil fired furnace

If the coke formed from the residue of the caking coal is hard, porous and strong then it is called coking coal.

A

True

B

False

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

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