Furnace Technology
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.

1250
350
750
1050

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Furnace Technology
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Rate of firing and emissivity of flame
Thermal conductivity of the charge & structural materials of furnace
Nature of process ; whether batch, continuous or intermittant
All of these

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