Which of the following thermocouples has the least temperature measurement range ?
Correct answer: A. Copper-constantan
- A. Copper-constantan
- B. Chromel-alumel
- C. Platinum-platinum/rhodium
- D. Iron-constantan
Explanation
Copper-constantan thermocouples have the narrowest useful range among these choices, typically extending only to roughly 350 to 400°C. Chromel-alumel, iron-constantan, and platinum-based thermocouples withstand higher temperatures.
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