FURNACE TECHNOLOGY QUIZ

Advantages of use of preheated combustion air are

All of these

Saving in fuel consumption

Increase in flame temperature

Reduction in scale losses

TRUE ANSWER : ?
YOUR ANSWER : ?

Decarburisation of steel

Is the removal of carbon from iron carbide (Fe₃C)

Is favoured by CO₂

Affects its crystalline structure

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of furnaces can be improved by

Maintaining proper draught

All of these

Minimising heat losses from furnace walls

Waste heat recovery from flue gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Turndown ratio of a burner gives an idea of the __________ in the furnace.

Maximum heat input rate only

Range of fuel firing rates

Volume of the combustion chamber

Minimum heat input rate only

TRUE ANSWER : ?
YOUR ANSWER : ?

Rotary kilns are used in the

Cement manufacture

Calcination of limestone & dolomite

Both A and B

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

Size of the combustion chamber of a furnace depends upon the

Method of mixing the fuel & air

Preheat temperature of fuel & air

All of these

Heat release rate of the fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Alkaline powders

Fine dolomite

Ammonia

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one shows the diagramatic heat balance in a furnace?

Ostwald chart

Cox chart

Sankey diagram

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum heat transfer in high temperature furnaces is by

Convection

Radiation

Either A, B or C; depends on the type of furnace

Conduction

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.

2000

4500

3000

6000

TRUE ANSWER : ?
YOUR ANSWER : ?

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