FURNACE TECHNOLOGY QUIZ

Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

Ammonia

None of these

Alkaline powders

Fine dolomite

TRUE ANSWER : ?
YOUR ANSWER : ?

Regenerators are used for waste heat recovery in

By-product coke ovens

Beehive coke oven

Blast furnace stoves

Soaking pits

TRUE ANSWER : ?
YOUR ANSWER : ?

In order to maintain a reducing atmosphere in a furnace, it should have

CO in flue gas

None of these

No O₂ in flue gas

High excess air

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Resistance

None of these

Low frequency induction

Arc

TRUE ANSWER : ?
YOUR ANSWER : ?

Size of the combustion chamber of a furnace depends upon the

Preheat temperature of fuel & air

All of these

Method of mixing the fuel & air

Heat release rate of the fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of an open hearth furnace may be about __________ percent.

5

20

50

80

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen enrichment of combustion air does not result in increase of the

Oxygen in the flue gas

Stack loss

Heat transfer rate in the furnace

Flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The resistance furnace produces heat by the

Electric arc struck between electrodes and the charge

Flow of current through a heating element

Combination of induced current and skin effect

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Forced recirculation of furnace gases is practised

To ensure uniform temperature

In furnaces, operating below 750°C

To increase heat transfer by convection

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Ceramic recuperators compared to metallic recuperators for the same duty

Are less costly

Occupy more space

Have higher pressure differential between flue gas & air side

Are lighter

TRUE ANSWER : ?
YOUR ANSWER : ?

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