Question

Why must an accurate extensometer be used in reading a permanent set?

(a) It is cheap

(b) To obtain accuracy

(c) It is radioactive

(d) It is unnecessary

This question was addressed to me by my school teacher while I was bunking the class.

I'd like to ask this question from Aircraft Materials topic in division Testing Aircraft Materials of Aerospace Materials & Processes

Answer 1

The correct choice is (b) To obtain accuracy

To explain: An extensometer must be used in reading the permanent set. An accurate extensometer is required to obtain the change in the property after the experiment is done, without any mistakes or problems with accuracy.