Structural Analysis Multiple Choice Questions and Answers

1. The number of independent equations to be satisfied for static equilibrium of a plane structure is a) 1 b) 2 c) 3 d) 6 Ans: c 2. If there are m unknown member forces, r unknown reaction components and j number of joints, then the degree of static indeterminacy of a pin‐jointed plane frame is given by a) m + r + 2j b) m ‐ r + 2j c) m + r ‐ 2j d) m + r ‐ 3j Ans: c 3. Number of unknown internal forces in each member of a rigid jointed plane frame is a) 1 b) 2 c) 3 d) 6 Ans: c 4. Degree of static indeterminacy of a rigid‐jointed plane frame having 15 members, 3 reaction components and 14 joints is a) 2 b) 3 c) 6 d) 8 Ans: c 5. Degree of kinematic indeterminacy of a pin‐jointed plane frame is given by a) 2j ‐ r b) j ‐ 2r c) 3j ‐ r d) 2j + r Ans: a 6. Independent displacement components at each joint of a rigid‐jointed plane frame are a) three linear movements b) two linear movements and one rotation c) one linear movement and two rotations d) three rotations Ans: b 7. If in a pin‐jointed plane frame (m + r) > 2j, then the frame is a) stable and statically determinate b) stable and statically indeterminate c) unstable d) none of the above where m is number of members, r is reaction components and j is number of joints Ans: b 8. A pin‐jointed plane frame is unstable if