Percentage of carbon monoxide in blast furnace gas may be around

Percentage of nitrogen in blast furnace gas may be around

A

5

B

25

C

55

D

80

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

A

20

B

40

C

60

D

80

In the blast furnace, incorporation of water vapour in the blast gives the following effect.

A

Increases the reducing potential of the gas

B

Increases the flame temperature

C

No significant change occurs

D

Increases the hydrogen content in the metal

Operation of blast furnace stove is based on the principles of a __________ furnace.

A

Regenerative

B

Recuperative

C

Both A and B

D

Neither A nor B

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

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

Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.

A

H₂O

B

CO₂

C

CO

D

CH₄

Coke oven gas compared to blast furnace gas is

A

More explosive and inflammable

B

Less poisonous

C

Lighter

D

All of the above

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

A

0.2

B

2

C

4

D

8

Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its

A

Non-wetting characteristic

B

High thermal conductivity

C

High crushing strength

D

None of these

Percentage of carbon monoxide in blast furnace gas may be around

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