C1102 Pages 4

Steel Brass

620077

- 200mm -~~--- 250mm ——

A rectangular block of metal of 50mmx25mm cross-section and 125mm length (10)
carries a tensile load of 100101 along its length, a compressive load of 1۸10 on its
50mmx125mm faces and a tensile load of 400KN on its 25mmx125mm faces.
If E = 208GN/m? and v = 0.3, find (a) change in volume of bar (b) increase required in
1MN load to produce no change in volume.
a) Define Torsional rigidity. (2) b) A 3m long solid shaft transmits 15kW at
1200rpm. Find the required diameter of (8) the shaft, assuming that maximum shear stress
in the shaft is limited to 25MPa and angle of twist is not to exceed 5°. Take G=80GPa.
PART 13

Answer any three full questions, each carries 10marks

Draw the shear force and bending moment diagrams for a beam shown in the (10) figure

given below. Also determine the value of maximum bending moment.

1012

a) Define point of contraflexure. (2) b) Draw the shear force and bending moment
diagrams for a beam shown in the (8) figure given below. Locate the point of

contraflexure.

ماد 712

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