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

Resistance
Arc
Low frequency induction
None of these

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Furnace Technology
In a furnace employing forced draught as compared to induced draught,

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
Positive pressure exists in the furnace
The fan operates hot and hence blades are liable to corrosion and erosion
None of these

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