Critical Air Blast (CAB) value of coke is a direct measure of its

Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

A

20

B

40

C

60

D

80

Coke oven gas is a better fuel than blast furnace gas, because of its higher

A

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

B

Adiabatic flame temperature

C

Heat release rate (thus requiring smaller combustion chamber)

D

All of the above

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

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

Abrasion index of blast furnace coke should be around __________ percent.

A

20

B

35

C

80

D

55

Coke is added in the blast furnace to

A

Reduce & melt the iron ore

B

Increase the fluidity of slag

C

Remove sulphur & phosphorus from molten metal

D

None of these

Critical Air Blast (CAB) value of coke is a direct measure of its

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