FURNACE TECHNOLOGY QUIZ

Reheating furnace (pusher type) is used for heating

Ingots

Steel coils

Slabs

Steel sheets

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In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by

Conduction

Can not be predicted

Convection

Radiation

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

Metallic recuperator

Regenerator

Ceramic recuperator

None of these

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

250

100

50

150

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The heat recoverable from flue gases of furnaces depends on the

Thermal efficiency of furnace

Flue gas temperature drop through the furnace

All of these

Quantity of flue gases

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In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Thermal conductivity of the charge & structural materials of furnace

Rate of firing and emissivity of flame

All of these

Nature of process ; whether batch, continuous or intermittant

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Cement Kiln is a

Tunnel Kiln

Natural draft furnace

Batch furnace

Rotary Kiln

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

< 10

< 2

< 8

< 5

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Heat transfer rate to the charge/stock in a furnace does not depend upon the

Flue gas temperature

Initial temperature of the charged stock

Type of fuels viz solid, liquid or gaseous

Emissivity of refractory walls

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Heat balance of furnace provides means of determining the

Thermal efficiency of the process

Scope of reduction of heat losses

Sources of heat losses

All of these

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