FURNACE TECHNOLOGY QUIZ

In a furnace employing forced draught as compared to induced draught,

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

The fan operates hot and hence blades are liable to corrosion and erosion

None of these

Positive pressure exists in the furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?

Ceramic recuperator

Regenerator

Waste heat boiler

Economiser

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of

Combustion of coal by supplying it around the burner

Transportation of coal

Preheating the primary air

Drying of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Advantages of use of preheated combustion air are

Saving in fuel consumption

Reduction in scale losses

All of these

Increase in flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The heat recoverable from flue gases of furnaces depends on the

Quantity of flue gases

Flue gas temperature drop through the furnace

All of these

Thermal efficiency of furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.

3000

4500

2000

6000

TRUE ANSWER : ?
YOUR ANSWER : ?

Regenerators compared to the recuperators for the same duty

Are less costly

Occupy more space

Are of smaller size

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Pulverised fuel fired furnaces employ __________ fuel firing.

Horizontal

All of these

Tangential

Vertical

TRUE ANSWER : ?
YOUR ANSWER : ?

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

None of these

CO in flue gas

High excess air

No O₂ in flue gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Shaft furnaces are used for

Smelting

Calcining

All of these

Roasting

TRUE ANSWER : ?
YOUR ANSWER : ?

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