FURNACE TECHNOLOGY QUIZ

Maximum heat transfer in high temperature furnaces is by

Conduction

Convection

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

Radiation

TRUE ANSWER : ?
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Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.

50

150

100

250

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Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

< 2

< 5

< 10

< 8

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Means for giving direction to the circulation of gases in furnaces are

Arrangement of heating stock in the furnaces

All of these

Fans

Location of outlet ports and heating & combustion devices

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Furnace pressure is normally controlled by regulating the

Fuel gas pressure

Air pressure

Damper

Speed of I.D. fan

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Use of pulverised coal in boilers provides

Less erosion on furnace wall

Higher calorific value

Better combustion

Smokeless burning

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Overfire burning in a furnace is a phenomenon characterised by

None of these

Supply of excess fuel

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

Supply of excess air

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Air filtration in a furnace

Increases the flue gas temperature

Reduces its thermal efficiency

Is indicated by flame sting out

None of these

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The heating capacity of muffle furnace depends on the

Properties of the muffle wall (temperature, area, emissivity)

Neither A nor B

Both A & B

Surface area & emissivity of the stock

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In a muffle furnace, the muffle

Assists in temperature equalisation in the charge

Retards the heat transfer

All of these

Permits the use of controlled atmosphere for the protection of stock

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