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Mechanical Engineering :: Strength of Materials

  1. The strain energy stored in a hollow circular shaft of outer diameter (D) and inner diameter (d) subjected to shear stress is

  2. A.
    x Volume of shaft
    B.
    x Volume of shaft
    C.
    x Volume of shaft
    D.
    x Volume of shaft

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  3. Fatigue test is carried out for

  4. A.
    stresses varying between two limits of equal value, but of opposite sign
    B.
    stresses varying between two limits of unequal value, but of opposite sign
    C.
    stresses varying between two limits of unequal value but of same sign
    D.
    all of the above

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  5. The section modulus (Z) of a beam is given by

  6. A.
    I/y
    B.
    I.y
    C.
    y/I
    D.
    M/I

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  7. Every direct stress is always accompanied by a strain in its own direction and an opposite kind of strain in every direction, at right angles to it. Such a strain is known as

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

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

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

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  11. When a rectangular beam is loaded transversely, the maximum tensile stress is developed on the

  12. A.
    top layer
    B.
    bottom layer
    C.
    neutral axis
    D.
    every cross-section

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  13. The compressive strength of brittle materials is __________ its tensile strength.

  14. A.
    equal to
    B.
    less than
    C.
    greater than

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  15. When a closely-coiied helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring (δ) is given by (where d = Diameter of spring wire, n = No. of turns of the spring, and C = Modulus of rigidity for the spring material)

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  17. In spring balances, the spring is used

  18. A.
    to apply forces
    B.
    to measure forces
    C.
    to absorb shocks
    D.
    to store strain energy

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  19. According to Euler's column theory, the crippling load of a column is given by p = π2 EI/Cl2. In the Euler's formula, the value of C for a column with both ends fixed is 4.

  20. A.
    Agree
    B.
    Disagree

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