Question

The thermo emf develops in a Cu-Fe thermocouple is 8.6 μV/^oC. It temperature of cold junction is 0^oC and temperature of hot junction is 40^oC then the emf obtained shall be

• A. 0.344 Mv
• B. 3.44 μV
• C. 3.44 V
• D. 3.44 Mv

Answer 1

Answer: (A)

0.344 Mv

Answer 2

By using thermo emf e = aθ where $a = 8.6\frac{\mu V}{oC}$ and

θ = temperature difference = 40^oC

So e = 8.6 × 10^–6 × 40 = 344 μV = 0.344 mV.