Furnace Technology
Means for giving direction to the circulation of gases in furnaces are

Location of outlet ports and heating & combustion devices
Arrangement of heating stock in the furnaces
All of these
Fans

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

Positive pressure exists in the furnace
None of these
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

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