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Question is

Thermo emf set up in thermocouple varies as E = aT – 1/2 bT2, where a, b are constant and T is temperature in kelvin. If a = 16.3 μV/°C and b = 0.042 μV/(°C)2, then inversion temperature is

  • 776 °C 
  • 388 °C
  • 279 °C
  • none of these

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