Size of blast furnace grade coke is __________ mm.

Out of the following, which is the most important parameter for the blast furnace grade coke?

A

CSR & CRI

B

Ash content

C

Moisture content

D

Volatile matter content

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

A

20

B

35

C

80

D

55

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

A

20

B

40

C

60

D

80

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

Blast furnace gas compared to coke oven gas has

A

Lower ignition temperature

B

Narrower limit of inflammability

C

Higher calorific value

D

Lower theoretical flame temperature

Increase in ash content of blast furnace coke

A

Reduces its consumption in the furnace

B

Increases its consumption in the furnace

C

Does not affect its consumption in the furnace

D

Decreases its hardness and abrasion resistance

The coke in the charge of blast furnace

A

Controls the grade of pig iron

B

Acts as an iron bearing mineral

C

Supplies heat to reduce ore and melt the iron

D

Forms a slag by combining with impurities

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

Coke oven gas compared to blast furnace gas is

A

More explosive and inflammable

B

Less poisonous

C

Lighter

D

All of the above

Blast furnace coke is made from coal by

A

Low temperature carbonisation

B

High temperature carbonisation

C

Medium temperature carbonisation

D

Heating the coal in an oven in presence of air

Size of blast furnace grade coke is __________ mm.

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