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UPSC Civil Service Exam Questions - Engineering

Q1:

What is the moment (approximate) of the force acting on a railway sign post shown in the figure about the point ?

A 1135 Nm

B 1205 Nm

C 980 Nm

D 1300 Nm

ANS:A - 1135 Nm

Take moments about point O by resolving 300N into horizontal and vertical components i.e.

300cos(30)*3.5+300sin(30)*1.5 = 1134.3Nm.