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Mechanical Engineering :: Strength of Materials

  1. The Poisson's ratio for cast iron varies from

  2. A.
    0.33 to 0.37
    B.
    0.21 to 0.26
    C.
    0.31 to 0.34
    D.
    0.32 to 0.42

  3. The Rankine's theory for active earth pressure is based on the assumption that

  4. A.
    the retained material is homogeneous and cohesionless
    B.
    the frictional resistance between the retaining wall and the retained material is neglected
    C.
    the failure of the retained material takes place along a plane called rupture plane
    D.
    all of the above

  5. The strain energy stored in a spring, when subjected to maximum load, without suffering permanent distortion, is known as

  6. A.
    impact energy
    B.
    proof resilience
    C.
    proof stress
    D.
    modulus of resilience

  7. An overhanging beam must overhang on both sides.

  8. A.
    Correct
    B.
    Incorrect

  9. The resultant stress on an inclined plane which is inclined at an angle θ to the normal cross-section of a body which is subjected to a direct tensile stress (σ) in one plane, is

  10. A.
    σ sin θ
    B.
    σ cos θ
    C.
    σ sin 2θ
    D.
    σ cos 2θ

  11. The ratio of change in volume to the original volume is called

  12. A.
    linear strain
    B.
    lateral strain
    C.
    volumetric strain
    D.
    Poisson's ratio

  13. In a beam where shear force changes sign, the bending moment will be

  14. A.
    zero
    B.
    minimum
    C.
    maximum
    D.
    infinity

  15. The maximum shear stress of a beam of triangular section occurs above the neutral axis,

  16. A.
    Correct
    B.
    Incorrect

  17. For the beam shown in the below figure, the shear force at A is equal to

  18. A.
    wl/6
    B.
    wl/3
    C.
    wl
    D.
    2 wl/3

  19. The ductility of a material __________ with the increase in percentage reduction in area of a specimen under tensile test.

  20. A.
    increases
    B.
    decreases
    C.
    remains same