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Mechanical Engineering :: Strength of Materials

  1. For a 25 mm hole drilled in plates, the diameter of rivet shank should be

  2. A.
    23mm
    B.
    24.5mm
    C.
    25mm
    D.
    26mm

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  3. A beam of uniform strength has

  4. 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

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  5. The shear force of a simply supported beam carrying a central point load changes sign at its midpoint.

  6. A.
    Correct
    B.
    Incorrect

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  7. In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the

  8. 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

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  9. The polar modulus for a solid shaft of diameter (D) is

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  11. The extremeties of any diameter on Mohr's circle represent

  12. 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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  13. The polar moment of inertia of a hollow shaft of outer diameter (D) and inner diameter (d) is

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  15. 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.

  16. A.
    1/16
    B.
    1/8
    C.
    1/4
    D.
    15/16

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  17. The bending moment of a cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is __________ at the fixed end.

  18. A.
    wl/2
    B.
    wl
    C.
    wl2/2
    D.
    wl2/6

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  19. In the below figure, the stress corresponding to point D is

  20. A.
    yield point stress
    B.
    breaking stress
    C.
    ultimate stress
    D.
    elastic limit

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