Furnace Technology
Turndown ratio of a burner gives an idea of the __________ in the furnace.

Minimum heat input rate only
Range of fuel firing rates
Volume of the combustion chamber
Maximum heat input rate only

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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
Positive pressure exists in the furnace
None of these
Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

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