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Mechanical Engineering :: Strength of Materials

  1. A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poission's ratio of the bar in tension will be __________ the Poisson's ratio for the bar in compression.

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

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  3. A square beam and a circular beam have the same length, same allowable stress and the same bending moment. The ratio of weights of the square beam to the circular beam is

  4. A.
    1/2
    B.
    1
    C.
    1/1.12
    D.
    1/2

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  5. A thin cylindrical shell of diameter (d), length (l) and thickness (t)is subjected to an internal pressure (p). The hoop stress in the shell is

  6. A.
    pd/t
    B.
    pd/2t
    C.
    pd/4t
    D.
    pd/6t

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  7. When a body is subjected to a direct tensile stress (σ) in one plane, then tangential or shear stress on an oblique section of the body inclined at an angle θ to the normal of the section is

  8. A.
    σ sin 2θ
    B.
    σ cos 2θ
    C.
    σ/2 sin 2θ
    D.
    σ/2 cos 2θ

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  9. The distance between the centre of a rivet hole to the nearest edge of plate, is called

  10. A.
    margin
    B.
    pitch
    C.
    back pitch
    D.
    diagonal pitch

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  11. A localised compressive stress at the area of contact between two members is known as

  12. A.
    tensile stress
    B.
    bending stress
    C.
    crushing stress
    D.
    shear stress

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  13. Two closely-coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be __________ that of spring 'B'.

  14. A.
    one-sixteenth
    B.
    one-eighth
    C.
    one-fourth
    D.
    one-half

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  15. In a tensile test, when the material is stressed beyond elastic limit, the tensile strain __________ as compared to the stress.

  16. A.
    decreases slowly
    B.
    increases slowly
    C.
    decreases more quickly
    D.
    increases more quickly

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  17. Poisson's ratio is the ratio of linear stein to the volumetric strain.

  18. A.
    True
    B.
    False

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  19. A section of beam is said to be in pure bending, if it is subjected to

  20. A.
    constant bending moment and constant shear force
    B.
    constant shear force and zero bending moment
    C.
    constant bending moment and zero shear force
    D.
    none of the above

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