Blast furnace stoves are meant for heating

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

The open "Sigrees" or coal stoves often require fanning to sustain burning because of

A

Tendency of carbon dioxide to form a layer along with dust smoke

B

Lack of oxygen in the surroundings of sigrees

C

Accumulation of smoke and dust over the sigrees

D

Interrupted release of moisture from the material

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

A

Hearth

B

Stack

C

Bosh

D

Throat

Blast furnace is used to produce

A

Pig iron

B

Cast iron

C

Wrought iron

D

Steel

Blast furnace stoves are meant for heating

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