Furnace Technology
Maximum heat transfer in high temperature furnaces is by

Convection
Radiation
Either A, B or C; depends on the type of furnace
Conduction

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

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

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