Furnace Technology
The heating capacity of muffle furnace depends on the

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

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

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