Which of the following is never used as an element of industrial resistance thermometer ?
Correct answer: A. Lead
- A. Lead
- B. Nickel
- C. Copper
- D. 30% iron + 70% nickel
Explanation
Lead is not normally used as the sensing element of an industrial resistance thermometer because its resistance-temperature characteristics are unsuitable compared with platinum, nickel, or copper. The iron-nickel alloy listed is also used in resistance devices.
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