Invar used in thermocouples is an alloy of nickel and________________?
Correct answer: B. Iron
- A. Copper
- B. Iron
- C. Chromium
- D. Lead
Explanation
Invar is a low-expansion iron-nickel alloy, commonly containing about 36% nickel, and is valued where dimensional stability is needed. The other listed metals are not the principal constituent paired with nickel in Invar.
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