30. A wooden board of 30cm X15cm X 2cm is to be heated from 30°C to 180°C in 10 minutes by dielectric heating using 40MHZ supply. Specific heat of wood is 0.35 and density 0.55gm/ccm, relative permeability = 5 and power factor 0.05. Estimate the voltage across specimen and current during heating. Assume efficiency as 90%.

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30.
A wooden board of 30cm X15cm X 2cm is to be heated from 30°C to 180°C in 10 minutes by dielectric
heating using 40MHZ supply. Specific heat of wood is 0.35 and density 0.55gm/ccm, relative
permeability
= 5 and power factor = 0.05. Estimate the voltage across specimen and current during
heating. Assume efficiency as 90%.
Transcribed Image Text:30. A wooden board of 30cm X15cm X 2cm is to be heated from 30°C to 180°C in 10 minutes by dielectric heating using 40MHZ supply. Specific heat of wood is 0.35 and density 0.55gm/ccm, relative permeability = 5 and power factor = 0.05. Estimate the voltage across specimen and current during heating. Assume efficiency as 90%.
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