Question

What amount of impurity is allowed for copper to be used in electric applications?

(a) 0.1%

(b) 0.2%

(c) 0.3%

(d) 0.4%

This question was addressed to me during an interview for a job.

I want to ask this question from Copper Alloys topic in chapter Foundry Introduction & Materials of Casting-Forming-Welding II

Answer 1

Correct option is (a) 0.1%

Easiest explanation: Copper and its alloys find themselves a variety of applications in the field of electrical and micro electrical works. For copper to be able to get used in electric appliances, the maximum impurity that can be allowed is 0.1%.