Principal alloying element in Elinvar (used for making hair springs for watches) is__________________?
Correct answer: C. Nickel
- A. Copper
- B. Aluminium
- C. Nickel
- D. Zinc
Explanation
Elinvar is a nickel-based alloy whose nearly constant elastic modulus makes it suitable for watch and instrument springs. Nickel is therefore its principal alloying element among the listed choices.
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