Furnace Technology
The main function of a muffle in the muffle furnace is to

Both A & B
Neither A nor B
Protect the charge from the effects of the products of combustion
Smooth out temperature inequalities on the combustion side of the muffle wall

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

Positive pressure exists in the furnace
The fan operates hot and hence blades are liable to corrosion and erosion
Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
None of these

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