Furnace Technology
In reverberatory furnace, charge is heated mainly by

Radiation of heat from the roof of the combustion chamber
None of these
Natural convection
Conduction

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Furnace Technology
Which is not accomplished in an underfired furnace?

Reduction in the temperature of furnace gases
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

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