The portion of the blast furnace below its widest cross-section is called

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

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

A

20

B

40

C

60

D

80

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

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

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

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

A

20

B

35

C

80

D

55

Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight

A

1.5

B

3

C

5

D

7

Which of the following combustibles is absent in blast furnace gas?

A

H₂

B

CH₄

C

CO

D

None of these

__________ atmosphere is maintained inside an iron blast furnace.

A

Oxidising

B

Reducing

C

Inert

D

Decarburising

The portion of the blast furnace below its widest cross-section is called

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