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

The fan operates hot and hence blades are liable to corrosion and erosion
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

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