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Mechanical Engineering :: Strength of Materials

  1. The maximum shear stress developed in a beam of circular section is __________ the average shear stress.

  2. A.
    equal to
    B.
    4/3 times
    C.
    1.5 times
    D.
    twice

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  3. When a body is subjected to a direct tensile stress (σ) in one plane, then maximum normal stress occurs at a section inclined at __________ to the normal of the section.

  4. A.
    B.
    30°
    C.
    45°
    D.
    90°

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  5. For no tension condition in the base of a short column of circular section, the line of action of the load should be within a circle of diameter equal to __________ of the main circle.

  6. A.
    one-half
    B.
    one-third
    C.
    one-fourth
    D.
    one-eighth

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  7. A rectangular beam of length l supported at its two ends carries a central point load W. The maximum deflection occurs

  8. A.
    at the ends
    B.
    at l/3 from both ends
    C.
    at the centre
    D.
    none of these

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  9. A leaf spring is supported at the

  10. A.
    ends and loaded at the centre
    B.
    centre and loaded at the ends
    C.
    ends and loaded anywhere
    D.
    centre and loaded anywhere

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  11. In leaf springs, the maximum bending stress developed in the plates is (where W = Load acting on the spring, l = Span of the spring, n = Number of plates, b = Width of plates, and t = Thickness of plates)

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  13. The unit of stress in S.I. units is

  14. A.
    N/mm2
    B.
    kN/mm2
    C.
    N/m2
    D.
    any one of these

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  15. The modulus of elasticity for mild steel is approximately equal to

  16. A.
    10 kN/mm2
    B.
    80 kN/mm2
    C.
    100 kN/mm2
    D.
    210 kN/mm2

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  17. The Rankine's formula holds good for

  18. A.
    short columns
    B.
    long columns
    C.
    both short and long columns
    D.
    weak columns

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  19. A rectangular beam subjected to a bending moment is shown in the below figure. The upper layer of the beam will be in tension.

  20. A.
    True
    B.
    False

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