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Civil Engineering :: Theory of Structures

  1. By applying the static equations i.e. Î£H = 0, ΣV = 0 and ΣM = 0, to a determinate structure, we may determine

  2. A.

    supporting reactions only

    B.

    shear forces only

    C.

    bending moments only

    D.

    internal forces only

    E.

    all the above.

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  3. The general expression for the B.M. of a beam of length l is the beam carries  

  4. A.

    a uniformly distributed load w/unit length

    B.

    a load varying linearly from zero at one end to w at the other end

    C.

    an isolated load at mid span

    D.

    none of these.


  5. The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is

  6. A.

    \(\frac { 1 } { 8 } \)

    B.

    \(\frac { 1 } { 4} \)

    C.

    \(\frac { 1 } { 2 } \)

    D.

    \(\frac { 1 } { 3 } \)

    E.

    1.0


  7. If a solid shaft (diameter 20 cm, length 400 cm, N = 0.8 x 105 N/mm2) when subjected to a twisting moment, produces maximum shear stress of 50 N/mm2, the angle of twist in radians, is

  8. A.

    0.001

    B.

    0.002

    C.

    0.0025

    D.

    0.003

    E.
    0.005

  9. The maximum B.M. due to an isolated load in a three hinged parabolic arch, (span l, rise h) having one of its hinges at the crown, occurs on either side of the crown at a distance

  10. A.

    \( \frac { 1 } {4 } \)

    B.

    \( \frac { h } {4 } \)

    C.

    \(\frac { I} { 2\sqrt{3} }\)

    D.

    \(\frac { I} { 3\sqrt{2} }\)


  11. The vertical reaction for the arch is

  12. A.

    \( \frac { wa } { 2 I} \)

    B.

    \( \frac { wI } { a} \)

    C.

    \( \frac { wa} { I} \)

    D.

    \( \frac { wa^2} { 2I} \)


  13. A bar of square section of area a2 is held such that its one of its diameters is vertical. The maximum shear stress will develop at a depth h where h is

  14. A.

    \(\frac { 2\sqrt{3} } { 4 }\)

    B.

    \(\frac { 3\sqrt{2} } { 4 }\)

    C.

    \( \frac { 2} { \sqrt{3}} \)

    D.

    \( \frac { \sqrt{3} } { 4 } \)


  15. The equivalent length of a column of length L, having both the ends hinged, is

  16. A.

    2L

    B.

    L

    C.

    \( \frac { L } { 2 } \)

    D.

    \( \frac { L } { \sqrt2 } \)


  17. A steel rod of sectional area 250 sq. mm connects two parallel walls 5 m apart. The nuts at the ends were tightened when the rod was heated to 100°C. If αsteel = 0.000012/C°, Esteel = 0.2 MN/mm2, the tensile force developed at a temperature of 50°C, is

  18. A.

    80 N/mm2

    B.

    100 N/mm2

    C.

    120 N/mm2

    D.

    150 N/mm2

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  19.  

    The ratio of circumferential stress to the longitudinal stress in the walls of a cylindrical shell, due to flowing liquid, is

  20. A.

    \( \frac { 1 } { 2 } \)

    B.

    1

    C.

    1\( \frac { 1 } { 2 } \)

    D.

    2