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Civil Engineering :: Theory of Structures

  1.  

    A composite beam is composed of two equal strips one of brass and other of steel. If the temperature is raised

  2. A.

    steel experiences tensile force

    B.

    brass experiences compressive force

    C.

    composite beam gets subjected to a couple

    D.

    composite beam bends

    E.

    All the above.

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  3. A two hinged parabolic arch of span l and rise h carries a load varying from zero at the left end to ω per unit run at the right end. The horizontal thrust is

  4. A.

    \( \frac { wI^2 } { 4h} \)

    B.

    \( \frac { wI^2 } { 8h} \)

    C.

    \( \frac { wI^2 } { 12h} \)

    D.

    \( \frac { wI^2 } { 16h} \)


  5. The force in EC of the truss shown in the given figure, is

  6. A.

    zero

    B.

    5t tension

    C.

    5t compression

    D.

    4t tension

    E.

    None of these.


  7. Shear centre of a half circular section of radius r and of constant thickness, lies at a distance of x from the centre where x is

  8. A.

    \( \frac { r } { n } \)

    B.

    \( \frac { r } { n } \)

    C.

    \( \frac { r } { n } \)

    D.

    \( \frac { r } { n } \)


  9. Pick up the correct statement from the following:

  10. A.

    The moment of inertia is calculated about the axis about which bending takes place

    B.

    If tensile stress is less than axial stress, the section experiences compressive stress

    C.

    If tensile stress is equal to axial stress, the section experiences compressive stress

    D.

    If tensile stress is more than axial stress, some portion of the section experiences a tensile stress

    E.

    All the above.

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  11. The forces acting on the bar as shown in the given figure introduce

  12. A.

    compressive stress

    B.
    tensile stress
    C.

    shear stress

    D.

    none of these.


  13. The equation of a parabolic arch of span l and rise h, is given by

  14. A.

    Y = \( \frac { h } { I^2 } \) X (1-X)

    B.

    Y = \( \frac { 2h } { I^2 } \) X (1-X)Y = \( \frac { 3h } { I^2 } \) X (1-X)

    C.

    Y = \( \frac { 3h } { I^2 } \) X (1-X)

    D.

    Y =\( \frac { 4h } { I^2 } \) (1-X)


  15. Pick up the correct statement from the following:

  16. A.

    A wire wound in spiral form, is called a helical spring

    B.

    The pitch of a close coil spring, is very small

    C.
    The angle made by the coil with horizontal, is called the angle of helix
    D.

    In the open coil helical spring, the angle of helix is comparatively large

    E.

    All the above.

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  17. The horizontal thrust on the ends of a two hinged semicircular arch of radius R carrying

  18. A.

    a uniformly distributed load ω per unit run over its right half span, is 

     \( \frac { 2 } { 3 } \) \( \frac { wR } { n } \)

    B.

    a uniformly distributed load ω per unit run over its right half span, is  \( \frac { 4 } { 3 } \)\( \frac { wR } { n } \)

    C.

    a distributed load varying from zero at the left end to ω per unit horizontal run at the right end, is \( \frac { 2 } { 3 } \) \( \frac { wR } { n } \)

    D.

    all the above.


  19. Maximum principal stress theory for the failure of a material at elastic point, is known

  20. A.

    Guest's or Trecas' theory

    B.

    St. Venant's theory

    C.

    Rankine's theory

    D.

    Haig's theory

    E.

    Von Mises's theory.

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