Question

The arrangement of some of the metals forming thermoelectric series is Sb, Fe, Zn, Ag, Mo, Cr,Sn, Pb, Hg, Mn, Cu, Co, Ni, Bi.
Arrange the following thermo-couples in the ascending order of producing thermo emf at a particular constant temperature
a) Fe - CO b) Sb - Bi
c) Ag - Mn d) Zn - Cu

• A. b, a, d, c
• B. c, d, a, b
• C. d, c, b, a
• D. b, c, d, a

Answer 1

The correct option is B c, d, a, b

A thermocouple is an electrical device consisting of two different conductors forming electrical junctions at differing temperatures. A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect.

When current is formed by the thermocouple in this series, the thermo–emf increases depending upon how far these metals are in the series, the farther they are the greater the emf.

Hence, correct answer is option B.