FURNACE TECHNOLOGY QUIZ

Forced recirculation of furnace gases is practised

To increase heat transfer by convection

All of these

In furnaces, operating below 750°C

To ensure uniform temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Use of excessive positive draft in the furnace

Imperfect mixing of fuel & air and infiltration of air

Use of non-preheated combustion air

Use of pulverised solid fuels

TRUE ANSWER : ?
YOUR ANSWER : ?

Circulation of gases in furnace is caused by the

Difference in density between hot and cold gases

Furnace pressure in conjunction with draft in flues

Change in volume during a change of temperature

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ furnace is not an electric furnace.

Arc

Induction

Pot

Resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

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

20

65

40

80

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a directly fired intermittant furnace?

Tower furnace

Walking beam reheating furnace

Tunnel kiln

Reverberatory furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Overfire burning in a furnace is a phenomenon characterised by

Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air

Supply of excess fuel

None of these

Supply of excess air

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Either of the above

Sulphur penetration

Oxidation/scaling

Decarburising

TRUE ANSWER : ?
YOUR ANSWER : ?

Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the

Corrosive nature of the waste gas

All of these

Dust concentration & nature of dust in waste gas

Quantity & temperature of waste gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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 : ?