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Mechanical Engineering :: Strength of Materials

  1. In a watch, the spring is used to store strain energy. This energy is released

  2. A.
    to stop the watch
    B.
    to run the watch
    C.
    to change the time
    D.
    all of these

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  3. A flitched beam is used to

  4. A.
    change the shape of the beam
    B.
    effect the saving in material
    C.
    equalise the strength in tension and compression
    D.
    increase the cross-section of the beam

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  5. A closely-coiled helical spring of stiffness k is cut into (n) equal parts. The stiffness in each part of the spring will be

  6. A.
    kn
    B.
    nk
    C.
    nk
    D.
    nk2

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  7. The ratio of the lateral strain to the linear strain is called

  8. A.
    modulus of elasticity
    B.
    modulus of rigidity
    C.
    bulk modulus
    D.
    Poisson's ratio

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  9. Hook's law holds good up to

  10. A.
    yield point
    B.
    elastic limit
    C.
    plastic limit
    D.
    breaking point

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  11. The shear force at the ends of a simply supported beam carrying a uniformly distributed load of w per unit length is

  12. A.
    zero at its both ends
    B.
    wl at one end and - wl at the other end
    C.
    wl/2 at one end and - wl/2 at the other end
    D.
    wl2/2 at one end and - wl2/2 at the other end

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  13. The shear modulus of most materials with respect to the modulus of elasticity is

  14. A.
    equal to half
    B.
    less than half
    C.
    more than half
    D.
    none of these

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  15. In a thin cylindrical shell subjected to an internal pressure p, the ratio of longitudinal stress to the hoop stress is

  16. A.
    1/2
    B.
    3/4
    C.
    1
    D.
    1.5

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  17. The maximum shear stress is __________ the algebraic difference of maximum and minimum normal stresses.

  18. A.
    equal to
    B.
    one-fourth
    C.
    one-half
    D.
    twice

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  19. The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is __________ at the free end.

  20. A.
    zero
    B.
    wl/4
    C.
    wl/2
    D.
    wl

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