Furnace Technology
The heating capacity of muffle furnace depends on the

Surface area & emissivity of the stock
Neither A nor B
Both A & B
Properties of the muffle wall (temperature, area, emissivity)

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Furnace Technology
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Use of pulverised solid fuels
Imperfect mixing of fuel & air and infiltration of air
Use of excessive positive draft in the furnace
Use of non-preheated combustion air

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Furnace Technology
Which is not accomplished in an underfired furnace?

Portection of the periphery of the charge from excessive radiation
Increase in heating capacity/m² of floor space
Elimination of cold spot at the bottom of the charge
Reduction in the temperature of furnace gases

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