Furnace Technology
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

Low emissivity
Neither A nor B
Both A and B
High thermal conductivity

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Furnace Technology
The reason for excessive clinker formation in gas producers is the

Use of fuel having too low an ash fusion temperature
All of these
Use of coal/coke containing a high % of fines and ash
Development of hot spots in the fuel bed and an abnormally high rate of gasification

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