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UPSC Civil Service Exam Questions - Engineering

Q1:

The plastic modulus of a section is 5 x 10-4m3. Its shape factor is 1.2 and the plastic moment capacity is 120 kNm. What is the value of the yield stress of the material ?

A 100 N/mm2

B 200 N/mm2

C 240 N/mm2

D 288 N/mm2

ANS:C - 240 N/mm2

@Priya.

Mp = plastic moment capacity
Zp = plastic section modulus
Fy = yield stress
Mp = Zp * fy =>
fy = Mp/Zp= 120 * 10^3/5* 10^-4,
= 24 * 10^7 N m^-2,
= 240 N/ mm2.