If the cold junction is held at 0^ C , the same thermo emf V of a thermocouple varies as V=10 10⁻⁶ t- 1 40 10⁻⁶ t^2 , where t is the temperature of the hot junction in ^ C . The neutral temperature and the maximum value of thermo emf are re

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If the cold junction is held at 0^ C , the same thermo emf V of a thermocouple varies as V=10 10⁻⁶ t- 1 40 10⁻⁶ t^2 , where t is the temperature of the hot junction in ^ C . The neutral temperature and the maximum value of thermo emf are respectively :

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Correct answer: D. 200^ C ; 1 mV

Given, V=10 10⁻⁶ t- 1 40 10⁻⁶ t^2 At neutral temperature d V d t =0 10 10⁻⁶- 1 20 10⁻⁶ t_n=0 or t_n=200^ C Also at neutral temperature, thermo emf is maximum. Thus, V_ =10 10⁻⁶(200)- 1 40 10⁻⁶(200)^2=2 10⁻³-1 10⁻³=1 mV

If the cold junction is held at 0^ C , the same thermo emf V of a thermocouple varies as V=10 10⁻⁶ t- 1 40 10⁻⁶ t^2 , where t is the temperature of the hot junction in ^ C . The neutral temperature and the maximum value of thermo emf are respectively :

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