Furnace Technology
Maximum heat transfer in high temperature furnaces is by

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

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Furnace Technology
The amount of combustible escaping uncon-sumed from the furnace, depends upon the

Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
All of these
Burner design (thoroughness of mixing versus stratification)
Air supplied and furnace temperature

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