Furnace Technology
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.

Arc
High frequency induction
Resistance
Low frequency induction

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

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

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Furnace Technology
Which is not accomplished in an underfired furnace?

Portection of the periphery of the charge from excessive radiation
Increase in heating capacity/m² of floor space
Reduction in the temperature of furnace gases
Elimination of cold spot at the bottom of the charge

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