UPSC Civil Service Exam Questions - Engineering

Q1:

A cantilever pin-jointed truss carries one load P at the point Z as shown in the given figure. The hinges in the vertical wall are at A and D. The truss has only three horizontal members AC, CG and GZ.
The nature of force in member AB

A is tensile

B is zero

C is compressive

D cannot be predicted

ANS:D - cannot be predicted

AC, CG and GZ. (ZERO MEMBER), CB, ZB, AB TENSION MEMBER, DB COMPRESSION MEMBER.