Measurements and Instrumentation - Engineering

Q1:

In a thermocouple two metal junctions between metals M1 and M2 are kept at temperature T1 and T2. The thermocouple emf is produced because

A M1, M2 are similar and T1, T2 are equal

B M1, M2 are similar but T1, T2 are unequal

C M1, M2 are dissimilar but T1, T2 are equal

D M1, M2 are dissimilar but T1, T2 are unequal

ANS:D - M1, M2 are dissimilar but T1, T2 are unequal

The two materials in thermocouple are different and the two junctions are kept at different temperatures.