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Q.Which of the following methods is used to control temperature in resistance furnaces?

  • AVariation of resistance
  • BVariation of voltage
  • CPeriodical switching on and off of the supply 
  • DAll of the above methods
Correct Answer : (D)

All of the above methods
Hints :

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.

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