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Part 1 MCQs Q1 A rectangular bar of width b and height h is being used as a cantilever The loading is in a plane parallel to the side b The section modulus is

Part 1: MCQs Q1 A rectangular bar of width b and height h is being used as a cantilever. The loading is in a plane parallel to the side b. The section modulus is A. B. C. ? D. none of these. The Section modulus = I/Y (this is max). Moment of inertia (I) = (d*b^3)/12 hence = (h*b^3)/12. Because width = b. Depth d = h. And y = b/2. Therefore Z= ( (h*b^3)/12)/(b/2). Z = (h*b^2)/6. Q2 The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, is A. ¼ B. ½ C. 1/16 D. ? 15/16 E. 3/8 The strength of a solid shaft in torsion is : T(solid shaft) = (pi/16)*(maximum stress)*(D^3). T(hollow shaft) = (pi/16)*(maximum stress)*(D^4-d^4)/D. After solving the answer is 15/16. Q3 For a simply supported beam with a central load, the bending moment is A. least at the centre B. least at the supports C. maximum at the supports D. ? maximum at the centre. Bending moment at the support is usually zero for a simply supported beam and it gets to maximum at the centre. However, in this instance the position of the load has not been decided, hence B is right. Q4 The force in member U2L2 of the truss shown in below figure, is A. 10 T tension B. ? 10 T compression C. Zero D. 15 T compression. The Force that acts towards the joints in the tress exerts compressive force. Part 2: Essay.

May 24 2020 View more View Less

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