strength-of-materials mechanical-engineering question and answers -Page 6

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Strength of Materials problems

1. In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the
Options
A. normal stress remains constant in all directions
B. normal stress varies linearly in the material
C. elastic constants are same in all the directions
D. elastic constants varies linearly in the material

4. A body is subjected to two normal stresses 20 kN/m² (tensile) and 10 kN/m² (compressive) acting perpendicular to each other. The maximum shear stress is
Options
A. 5 kN/m²
B. 10 kN/m²
C. 15 kN/m²
D. 20 kN/m²

6. A beam of uniform strength has
Options
A. same cross-section throughout the beam
B. same bending stress at every section
C. same bending moment at every section
D. same shear stress at every section

8. Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D/2. The strength of hollow shaft in torsion is __________ as that of solid shaft.
Options
A. 1/16
B. 1/8
C. 1/4
D. 15/16

9. The extremeties of any diameter on Mohr's circle represent
Options
A. principal stresses
B. normal stresses on planes at 45�
C. shear stresses on planes at 45�
D. normal and shear stresses on a plane

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