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 The thermo emf of a hypothetical thermocouple varies with the temperature e of hot junction as E = aθ + bθ2 in volts, where the ratio a / b is 700°C. If the cold junction is kept at O°C, then the neutral, temperature is
  • a)
    700°C
  • b)
    1400°C
  • c)
    390°C
  • d)
    no neutral temperature is possible for this thermocouple
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The thermo emf of a hypothetical thermocouple varies with the temperat...
The thermo emf is given by E = aθ + bθ2
For neutral temperature 
⇒ a + 2bθ= 0
But neutral temperature can never be negative (less than zero) i.e.,  θn< |0oC|
 Hence, no neutral temperature is possible for this thermocouple.
      
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The thermo emf of a hypothetical thermocouple varies with the temperature e of hot junction as E = aθ + bθ2in volts, where the ratio a / b is 700°C. If the cold junction is kept at O°C, then the neutral, temperature isa)700°Cb)1400°Cc)390°Cd)no neutral temperature is possible for this thermocoupleCorrect answer is option 'D'. Can you explain this answer?
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