Furnace Technology
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.

Sidefired
Covered
Underfired
Recirculating

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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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