FURNACE TECHNOLOGY QUIZ

Operation of blast furnace stove is based on the principles of a __________ furnace.

Neither A nor B

Recuperative

Regenerative

Both A and B

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In a muffle furnace, the muffle

Permits the use of controlled atmosphere for the protection of stock

Assists in temperature equalisation in the charge

All of these

Retards the heat transfer

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Protective gas used in the annealing furnace for steel coil comprises of

5% H₂ + 9% N₂

100% CO

100 %H₂

95% N₂ + 5% H₂

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Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

40

60

20

80

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Rate of heat release in a furnace, which is the measure of heat intensity is defined as

None of these

Kcal/m³ combustion space

Kcal/hr

Kcal/hr/m³ combustion space

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Use of pulverised coal in boilers provides

Better combustion

Smokeless burning

Less erosion on furnace wall

Higher calorific value

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An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

Resistance

Low frequency induction

Arc

None of these

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Artificial draught produced by a fan in the furnace can be controlled by the

Damper

Speed of the fan

Variation in the pitch of fan blades

All of these

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Which of the following furnaces will have maximum thermal efficiency?

Walking beam reheating furnace

Soaking pits

Rotary kilns

Boiler furnace

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Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

Oxygen enrichment of combustion air

Preheating the combustion air

Increasing the draft in the furnace

Preheating the fuel gas

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