84.
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?

86.
In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of

87.
Presence of SO2 in furnace gases attacks the ferrous metal by way of

88.
The main function of a muffle in the muffle furnace is to

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