Question

A thermocouple having a sensitivity of $40\left(\mu V{/}^{\circ }C\right)$ is calibrated at a reference temperature at $0^{\circ }C$, however if it is actually used with a reference temperature of ${40}^{\circ }C$, the output voltage in mV at ${100}^{\circ }C$ is

• A. 2.4

Answer 1

The correct option is A 2.4
Assume voltage at ${100}^{\circ }C$ w.r.t ${40}^{\circ }C$ is

$=40\left(\frac{\mu V}{{}^{\circ }C}\right)\times (100-40{)}^{\circ }C=40\times {10}^{-6}\times 60$

$=2400\times {10}^{-6}=2.4mV$