Furnace Technology
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

None of these
Resistance
Arc
Low frequency induction

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Furnace Technology
Turn down ratio of a burner

Is normally much more for a continuous furnace as compared to a batch furnace
Should be as low as possible i.e., 1 : 2
Is the ratio of maximum to minimum permissible heat input rates
Should be 1:1 for a batch type furnace.

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

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

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