In a furnace operation, which is not preheated?

Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?

A

Increase in calorific value of the fuel

B

Increase in flame temperature

C

Reduction in scale losses

D

Saving in fuel consumption

Use of preheated air for combustion of fuel in the furnace, increases the

A

Scale losses of the furnace stock

B

Calorific value of the fuel

C

Flame temperature

D

None of these

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

Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

A

Calorific value of the fuel

B

Flame temperature achieved

C

Speed of combustion of fuel

D

Heat transfer rate to the stock in the furnace

Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

A

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

B

It reduces its calorific value tremendously

C

It reduces its flame temperature tremendously

D

There are chances of explosion during preheating

Advantages of use of preheated combustion air are

A

Saving in fuel consumption

B

Reduction in scale losses

C

Increase in flame temperature

D

All of the above

__________ furnace is not an electric furnace.

A

Arc

B

Induction

C

Pot

D

Resistance

Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

A

Increasing the draft in the furnace

B

Preheating the fuel gas

C

Oxygen enrichment of combustion air

D

Preheating the combustion air

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

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

In a furnace operation, which is not preheated?

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