Furnace Technology
In low or standard frequency induction furnace, heat is produced by the

Current flow through a heating element
Combination of induced current and skin effect
None of these
Induction and resistance

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Furnace Technology
Which is not accomplished in an underfired furnace?

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

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