Question

The lower temperature junction in thermocouple is maintained at  ________

(a) -273 K

(b) 0 K

(c) -327 K

(d) 273 K

I have been asked this question during an internship interview.

My enquiry is from Transducers for Body Temperature Measurement in chapter Physiological Transducers of Biomedical Instrumentation

Answer 1

Right answer is (d) 273 K

For explanation I would say: The lower temperature junction in thermocouple is maintained at 273 K (0^0C). The junction at lower temperature in the thermocouple is called the reference temperature. The junction at higher temperature in thermocouple is termed as measuring junction.