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

Low frequency induction
Arc
Resistance
High frequency induction

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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
Elimination of cold spot at the bottom of the charge
Reduction in the temperature of furnace gases

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