FURNACE TECHNOLOGY QUIZ

Decarburisation of steel

Is favoured by CO₂

Affects its crystalline structure

All of these

Is the removal of carbon from iron carbide (Fe₃C)

TRUE ANSWER : ?
YOUR ANSWER : ?

The advantages of firing pulverised coal in the furnace lies in the fact that, it

Permits the use of low fusion point ash coal

Permits the use of high ash content coal

Accelerates the burning rate and economises on fuel consumption

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most suitable for preheating combustion air above 650°C ?

None of these

Regenerator

Ceramic recuperator

Metallic recuperator

TRUE ANSWER : ?
YOUR ANSWER : ?

Use of pulverised coal in boilers provides

Better combustion

Less erosion on furnace wall

Higher calorific value

Smokeless burning

TRUE ANSWER : ?
YOUR ANSWER : ?

In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?

Regenerator

Waste heat boiler

Recuperator

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

In reverberatory furnace, charge is heated mainly by

None of these

Natural convection

Conduction

Radiation of heat from the roof of the combustion chamber

TRUE ANSWER : ?
YOUR ANSWER : ?

The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.

85

50

99

65

TRUE ANSWER : ?
YOUR ANSWER : ?

Ostwald charts are meant for

Computing the excess/deficiency of combustion air

None of these

Calculation of flue gas temperature

Computation of flue gas analysis

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ furnace is not an electric furnace.

Induction

Resistance

Pot

Arc

TRUE ANSWER : ?
YOUR ANSWER : ?

In low or standard frequency induction furnace, heat is produced by the

Induction and resistance

None of these

Combination of induced current and skin effect

Current flow through a heating element

TRUE ANSWER : ?
YOUR ANSWER : ?

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