FURNACE TECHNOLOGY QUIZ

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

None of these

CO in flue gas

No O₂ in flue gas

High excess air

TRUE ANSWER : ?
YOUR ANSWER : ?

The function of an economiser in a boiler is to preheat the

Combustion air

Pulverised coal

Furnace oil

Feedwater

TRUE ANSWER : ?
YOUR ANSWER : ?

Size of the combustion chamber of a furnace depends upon the

Heat release rate of the fuel

Method of mixing the fuel & air

All of these

Preheat temperature of fuel & air

TRUE ANSWER : ?
YOUR ANSWER : ?

Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

Neither A nor B

Low emissivity

High thermal conductivity

Both A and B

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

65

80

20

40

TRUE ANSWER : ?
YOUR ANSWER : ?

Hearth furnaces are not used for

Roasting

None of these

Reheating

Melting

TRUE ANSWER : ?
YOUR ANSWER : ?

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

80

40

60

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Use of pulverised coal in boilers provides

Less erosion on furnace wall

Smokeless burning

Better combustion

Higher calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Nature of process ; whether batch, continuous or intermittant

All of these

Thermal conductivity of the charge & structural materials of furnace

Rate of firing and emissivity of flame

TRUE ANSWER : ?
YOUR ANSWER : ?

Advantages of use of preheated combustion air are

Reduction in scale losses

Saving in fuel consumption

All of these

Increase in flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

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