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The frequency range required for dielectric heating is:
1. 50 Hz to 500 Hz
2. 10 kHz to 200 kHz
3. 500 Hz to 10 kHz
4. 1 MHz to 50 MHz

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Correct Answer - Option 4 : 1 MHz to 50 MHz

Dielectric heating:

  • It is also known as capacitance heating. It is the method of heating non-conductive materials.
  • The material to be heated is placed between two electrodes, to which a high-frequency energy source is connected.
  • The oscillating field passes through the material and as the field direction changes, the polarisation of individual molecules reverses rapidly, causing friction and hence heat.
  • The higher the frequency, the greater the movement.
  • Typically, frequencies in the range of 1 MHz to 50 MHz are used.
  • The normal voltage used is around 15 kV.
  • The use of high voltage is limited due to the breakdown voltage of thin dielectric that is to be heated under normal conditions.
  • The voltage gradient is limited to 18 kV/cm.
  • This technology is used in Wood Gluing, RF Drying, and Plastic Welding.

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