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UPSC Civil Service Exam Questions - Engineering

Q1:

At a certain point in a structural member, there are perpendicular stresses 80 N/mm2 and 20 N/mm2, both tensile. What is the equivalent stress in simple tension, according to the maximum principal strain theory ? (Poisson's ratio = 0.25)

A zero

B 20 N/mm2

C 60 N/mm2

D 75 N/mm2

ANS:D - 75 N/mm2

Since stress are 80 and 20.
So as per principal strain theory.
80-0.25X20.
= 75.