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UPSC Civil Service Exam Questions

Q1:

A point in an element is stressed as shown in the given figure. What is the value of normal stress on the oblique plane BE ?

A 200 N / mm2

B 175 N / mm2

C 150 N / mm2

D 100 N / mm2

ANS:A - 200 N / mm2

Stress= 100 Cos2a+ 100 Sin2 a+2*0 cos a * Sin a.
= 100*(1.732/2)Square + 100* (1/2)Square +0.
= 100*3/4 +100 * 1/4,
= 100 N/mm2.



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