AIPMT PRELIMS2005Physics-Thermoelectric Effects
AIPMT PRELIMS 2005 Physics Thermocouples MCQ Question
Type: MCQ-numerical-Medium-Class 11
The temperature of inversion of a thermocouple is 620°C and the neutral temperature is 300°C. What is the temperature of cold junction?
A
20°C
B
120°C
C
-20°C
D
-120°C
Correct Answer
Option C
Detailed Explanation
The temperature of inversion (T_i) is given by T_i = 2T_n - T_c, where T_n is the neutral temperature and T_c is the cold junction temperature. Solving for T_c gives T_c = 2T_n - T_i = 2(300) - 620 = -20°C.
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