______________ wire is never used for making the heating element ?
Correct answer: C. Invar
- A. Nichrome
- B. Kanthal
- C. Invar
- D. None of these
Explanation
Invar is a low-expansion nickel-iron alloy designed for dimensional stability, not for high electrical resistance and heat generation. Nichrome and Kanthal are standard heating-element alloys because they tolerate high temperatures and resist oxidation.
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