FURNACE TECHNOLOGY QUIZ

Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

40

80

60

20

TRUE ANSWER : ?
YOUR ANSWER : ?

In reverberatory furnace, charge is heated mainly by

Radiation of heat from the roof of the combustion chamber

Conduction

Natural convection

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Ingress of cold air in the furnaces through cracks, charging doors, openings etc.

Reduces the furnace draught

All of these

Reduces the flue gas temperature and makes the furnace atmosphere oxidising

Increases the load on the induced draft fan

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ furnace is not an electric furnace.

Induction

Resistance

Pot

Arc

TRUE ANSWER : ?
YOUR ANSWER : ?

Size of the combustion chamber of a furnace depends upon the

All of these

Heat release rate of the fuel

Method of mixing the fuel & air

Preheat temperature of fuel & air

TRUE ANSWER : ?
YOUR ANSWER : ?

Shaft furnaces are used for

Calcining

Roasting

All of these

Smelting

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Increasing the draft in the furnace

Preheating the fuel gas

Oxygen enrichment of combustion air

Preheating the combustion air

TRUE ANSWER : ?
YOUR ANSWER : ?

The purpose of controlling the furnace atmosphere is to prevent surface attack by

Oxidation/scaling

Decarburising

Either of the above

Sulphur penetration

TRUE ANSWER : ?
YOUR ANSWER : ?

Hearth furnaces are not used for

Roasting

Reheating

Melting

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following variables does not affect the furnace capacity?

None of these

Ratio of wall surface to surface of stock

Size of the furnace

Gas velocity in furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

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