12.
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.

13.
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

16.
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

18.
Fuel economy in an industrial furnace operation can not be achieved by the use of

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