Furnace Technology
Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

Thick firebed and preheated primary air
Low reactivity of carbonised residue containing high proportion of iron & sulphur
Low forced draft & fuel bed temperature
All of these

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

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
Positive pressure exists in the furnace

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