The thermocouple pair that gives the maximum sensitivity of around 273 K is:
Show Hint
- Platinum-Constantan
- Nichrome-Constantan
- Nickil-Constantan
- Copper-Nickel
The Correct Option is B
Solution and Explanation
In instrumentation engineering, a thermocouple pair's sensitivity at a specific temperature is determined by the Seebeck effect, which is the generation of an electromotive force (EMF) in response to a temperature gradient between two dissimilar metals. The sensitivity of a thermocouple, expressed in microvolts per degree Celsius (μV/°C), depends on the materials used.
At around 273 K (0°C), the sensitivity of various thermocouple pairs can differ significantly. In this case, the thermocouple pair that provides the maximum sensitivity is Nichrome-Constantan. This suggests that the thermal and electrical properties of Nichrome and Constantan make them particularly effective at generating a measurable EMF around this temperature, making the pair highly sensitive for instrumentation purposes.
Therefore, choosing a Nichrome-Constantan pair for applications requiring high sensitivity at low temperatures is optimal due to its superior performance compared to the other listed options.
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