Question

Constantan is an alloy composed of select one: 1. 86% copper ,12% manganese and 2% nickel 2. 60% copper and 40% nickel 3. 1% iron ,2% manganese and 76% nickel,21% chromium 4. 40% copper, 40 %nickel and 20% carbon

Answer 1

55%copper and45% nickel is the answer to the question.