Question

Calculate the load stress if the value of force is 20 N and the area of cross-section is 2 m^2.

(a) 10 N/m^2

(b) 20 N/m^2

(c) 30 N/m^2

(d) 40 N/m^2

I have been asked this question during an interview for a job.

Question is from Motors Rating and Heating topic in division Rating and Heating of Motors of Electric Drives

Answer 1

The correct choice is (a) 10 N/m^2

The best I can explain: The stress is defined as the ratio of the internal restoring force and area of the cross-section. Stress=Fres÷A=20÷2=10 N/m^2.