Question

What is the temperature at which the lower junction in thermocouple is maintained?

(a) 0 K

(b) 273 K

(c) -327 K

(d) -273 K

I had been asked this question in an internship interview.

This interesting question is from Essential Parameters for Telemedicine in chapter Telemedicine Technology of Biomedical Instrumentation

Answer 1

Right option is (b) 273 K

Best explanation: The lower temperature junction in thermocouple is maintained at  273 K (0*C). The junction at lower temperature in the thermocouple is called the reference temperature. The junction at a higher temperature in thermocouple is termed as measuring junction.