Furnace Technology
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

Both A and B
Neither A nor B
Low emissivity
High thermal conductivity

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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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