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

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

A

Silica

B

Fireclay

C

Dolomite

D

Magnesite

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

A

Killed

B

Rimming

C

High alloy

D

None of these

__________ 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

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

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

The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.

A

Arc

B

Resistance

C

Low frequency induction

D

High frequency induction

Chimney Sweeps employs people to clean fireplaces and chimneys in homes and apartments.The firm is primarily the marketer of which one of the following?

A

An image

B

A service

C

A good

D

An idea

The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.

A

Lower than

B

Higher than

C

Same as

D

Not related to

The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.

A

Lower than

B

Higher than

C

Same as

D

Not related to

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

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