In reverberatory furnace, charge is heated mainly by

Reverberatory furnace is used for

A

Roasting/reduction of ores

B

Annealing steel coil

C

Heating air

D

Steel melting

An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

A

Resistance

B

Arc

C

Low frequency induction

D

None of these

In salt bath furnace, heat is transferred to the charge mainly by

A

Conduction

B

Convection

C

Radiation

D

None of these

__________ is an indirectly heated furnace.

A

Open hearth furnace

B

Muffle furnace

C

Soaking pit

D

Reheating furnace

An example of indirectly heated furnace is the

A

Soaking pit

B

Muffle furnace

C

Reheating furnace

D

None of these

Example of an indirectly heated furnace is

A

Hood annealing furnace

B

Muffle furnace

C

Both A and B

D

Neither A nor B

Air at a particular humidity is heated in a furnace. The new dew point

A

Decreases

B

Increases

C

Depends on the extent of heating

D

Remain unchanged

A mixture of phosphate rock __________ is heated in an electric furnace to produce phosphorous.

A

Salt & coke

B

Sand & coke

C

And coke

D

And sand

Which furnace employs an I.D. fan for the removal of flue gases from the furnace?

A

Coke oven

B

Blast furnace stoves

C

Beehive coke oven

D

High pressure boiler

Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

A

Low amount of excess combustion air

B

Large quantity of excess combustion air

C

Hydrocarbon fuel

D

Pulverised coal as fuel

In reverberatory furnace, charge is heated mainly by

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