Question

A thermocouple should preferably not be used to measure temperatures:
A. Above neutral temperature
B. Below neutral temperature
C. Above cold junction temperature
D. Above hot junction temperature

Answer 1

To solve this question we have to know about the thermocouple. We know that, A thermocouple is an electrical gadget consisting of two different electrical transmitters framing an electrical intersection. A thermocouple creates a temperature-subordinate voltage because of the thermoelectric impact, and this voltage can be deciphered to quantify temperature.

Complete answer:
We also know that Thermocouples are a typical detached detecting component that react to temperature in a quantifiable manner. They are self-fueled, requiring no excitation, and can work over a wide temperature range (up to 2000°C). They can react rapidly, with basically no huge postponement in framework activity.

we can say, the thermocouple working standard depends on the See back Effect. This impact expresses that when a shut circuit is framed by joining two divergent metals at two intersections, and intersections are kept up at various temperatures then an electromotive power (e.m.f.) is prompted in this shut circuit.so, we can say that, a thermocouple should preferably not be used to measure temperature above hot junction temperature.

So the right option will be D.

Note: We have to know that, A thermocouple is a sensor for estimating temperature. This sensor comprises two different metal wires, joined toward one side, and associated with a thermocouple thermometer or other thermocouple-competent gadget at the opposite end.