__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.

Iron ore hametite is concentrated using

A

Electro magnetic separation mainly

B

Gravity separation

C

Froth floatation

D

Roasting

Which is the main reducing agent during production of iron from iron ore in a blast furnace?

A

C

B

CO

C

CO₂

D

H₂

Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?

A

Silica

B

Lime

C

Alumina

D

Fluorite

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

A

20

B

40

C

60

D

80

Blast furnace produces following by reduction of iron ore

A

Cast iron

B

Pig iron

C

Wrought iron

D

Malleable iron

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

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

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 fuel mostly used in blast furnace for extracting pig iron from iron ores is

A

Hard coke

B

Soft coke

C

Pulverized coal

D

Bituminous coal

Pig iron is produced by blast furnaces in India using mostly the iron ore named

A

Hematite

B

Magnetite

C

Siderite

D

Chalcopyrite

__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.

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