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Mechanical Engineering :: Strength of Materials

  1. The design of thin cylindrical shells is based on

  2. A.
    hoop stress
    B.
    longitudinal stress
    C.
    arithmetic mean of the hoop and the longitudinal stress
    D.
    geometric mean of the hoop and longitudinal stress

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  3. When a body is subjected to bi-axial stress i.e. direct stresses (σx) and (σy) in two mutually perpendicular planes accompanied by a simple shear stress (τxy), then maximum shear stress is

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  5. The pull required to crush the rivet per pitch length is

  6. A.
    p.tt
    B.
    d.tc
    C.
    π/4 x d2 x σt
    D.
    π/4 x d2 x σc

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  7. When a bar of length l and diameter d is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)

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  9. The deformation of the bar per unit length in the direction of the force is known as

  10. A.
    linear strain
    B.
    lateral strain
    C.
    volumetric strain
    D.
    shear strain

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  11. Which of the following statement is correct?

  12. A.
    The stress is the pressure per unit area.
    B.
    The strain is expressed in mm.
    C.
    Hook's law holds good upto the breaking point.
    D.
    Stress is directly proportional to strain within elastic limit.

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  13. The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by

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  15. In watches, the spring is used to absorb shocks and vibrations.

  16. A.
    Yes
    B.
    No

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  17. The polar moment of inertia of a solid circular shaft of diameter (D) is

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  19. The volumetric strain is the ratio of the

  20. A.
    original thickness to the change in thickness
    B.
    change in thickness to the original thickness
    C.
    original volume to the change in volume
    D.
    change in volume to the original volume

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