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UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following factors :
1. Large number of loading cycles
2. Large variations in stress
3. Large stress concentration.
Those associated with fatigue would include

A 1 and 2

B 1 and 3

C 2 and 3

D 1, 2 and 3

ANS:A - 1 and 2

I think it should be Option D.