The temperature inside a resistance furnace can be varied by Disconnecting some of the heating elements or Varying the operating voltages or Varying the current through heating elements.
2.In induction heating _____________ is abnormally high
The methods is used to control temperature in resistance furnaces are 1. Variation of resistance, 2. Variation of voltage, 3. Periodical switching on and off of the supply.
14.It is desirable to operate the arc furnaces at power factor of
Due to Hysteresis loss as well as eddy current loss taking place in the charge
Explanation:
In heating the ferromagnetic material by induction heating, heat is produced due to Hysteresis loss as well as eddy current loss taking place in the charge.
20.Radiant heating is used for which of the following?