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UPSC Civil Service Exam Questions - Engineering

Q1:

Figure shows the forces acting on a body. Each square is 3 cm x 3 cm. If F1 = 30 N, F2 = 15 N, F3 = 25 N and F4 = 20 N, the resultant force and the moment about point O, respectively, are

A 0 N, 0 Ncm

B 90 N, 80 Ncm

C 60 N, 60 Ncm

D 30 N, 30 Ncm

ANS:A - 0 N, 0 Ncm

F3' =F3 sin 36.87=15 kn.

F3"=20 kn downward.

sumV> F1-F2-F3'=0 & F4-F3"=0,
sumM> F1* 9 - F2* 6 - F* 9=0.