Hearth furnaces are not used for

Basic open hearth furnace (BOF) is not used for producing __________ steel.

A

Killed

B

Rimming

C

High alloy

D

None of these

Which is not a hearth furnace?

A

Glass tank furnace

B

Open hearth furnace

C

Cupola

D

Reheating furnace

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

If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.

A

Sidefired

B

Underfired

C

Covered

D

Recirculating

Roof of a basic open hearth furnace is lined with __________ bricks.

A

Silica

B

Fireclay

C

Dolomite

D

Magnesite

__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

A

High thermal conductivity

B

Low porosity

C

Non-wetting characteristics

D

High density

Bottom of basic open hearth furnace are constructed of

A

Dead burnt magnesite ramming mass

B

Porous fireclay bricks

C

Semi-silica bricks

D

Silicon carbide bricks

Which of the following methods is used to control temperature in resistance furnaces?

A

Variation of resistance

B

Variation of voltage

C

Periodical switching on and off of the supply

D

All of the above methods

Magnesite bricks are used in those parts of furnaces, which are

A

Subjected to temperature fluctuation

B

Required to resist corrosive basic slag

C

Subjected to high load

D

None of these

Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

A

Babbitt metal

B

Monel metal

C

Nichrome

D

Phosphor bronze

Hearth furnaces are not used for

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