A good metallurgical coke should have very low

A good metallurgical coke

A

Should have high porosity

B

Should be brittle

C

Must contain moderate quantities of ash, moisture, sulphur and volatile matters

D

Should have low fusion point of its ash

Caking index of the coal blend used for the manufacture of metallurgical coke should be around

A

5

B

21

C

40

D

48

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

A

1-2

B

10-15

C

22-26

D

30-33

Quantity of coke produced from metallurgical coal may be around __________ percent.

A

30

B

50

C

75

D

95

Higher percentage of ash in coal meant for the production of metallurgical grade coke

A

Decreases the hardness of coke

B

Decreases the abrasion resistance of coke

C

Causes brittleness in steel

D

None of these

In a group of 60 people, 27 like coke and 42 like borhani and each person likes at least one of the two drinks How many people like both coke and borhani?

A

9

B

129

C

69

D

15

Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.

A

Colour

B

Moisture content

C

Ash content

D

Volatile matter

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

During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

A

Density

B

Porosity

C

Electrical resistivity

D

None of these

Width of the coke oven towards coke side is slightly more than that on pusher side to

A

Facilitate easy discharging of coke as it swells during carbonisation

B

Facilitate uniform heating of the oven

C

Increase the output of the coke

D

None of these

A good metallurgical coke should have very low

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