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Civil Engineering :: Theory of Structures

  1. If a concrete column 200 × 200 mm in cross-section is reinforced with four steel bars of 1200 mm² total cross-sectional area. Calculate the safe load for the column if permissible stress in concrete is 5 N/mm² and Es is 15 Ec

  2. A.

     264 MN

    B.

     274 MN

    C.

     284 MN

    D.

     294 MN

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  3. Slenderness ratio of a long column, is

  4. A.

     Area of cross-section divided by radius of gyration

    B.

     Area of cross-section divided by least radius of gyration

    C.

     Radius of gyration divided by area of cross-section

    D.

     Length of column divided by least radius of gyration

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  5. The ratio of the area of cross-section of a circular section to the area of its core, is

  6. A.

     4

    B.

     8

    C.

     12

    D.

     16

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  7. A truss containing j joints and m members, will be a simple truss if

  8. A.

     m = 2j – 3

    B.

     j = 2m – 3

    C.

     m = 3j – 2

    D.

     j = 3m – 2

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  9. For beams breadth is constant,

  10. A.

     Depth d M

    B.

     Depth d 3

    C.

     Depth d

    D.

     Depth d 1/M

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  11. Flat spiral springs

  12. A.

     Consist of uniform thin strips

    B.

     Are supported at outer end

    C.

     Are wound by applying a torque

    D.

     All the above

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  13. The ratio of lateral strain to axial strain of a homogeneous material, is known

  14. A.

     Yield ratio

    B.

     Hooke’s ratio

    C.

     Poisson’s ratio

    D.

     Plastic ratio

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  15. 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 steel = 0.000012/C°, Esteel = 0.2 MN/mm², the tensile force developed at a temperature of 50°C, is

  16. A.

     80 N/mm²

    B.

     100 N/mm 2

    C.

     120 N/mm²

    D.

     150 N/mm²

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  17. In case of principal axes of a section

  18. A.

     Sum of moment of inertia is zero

    B.

     Difference of moment inertia is zero

    C.

     Product of moment of inertia is zero

    D.

     None of these

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  19. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix

  20. A.

     It is subjected to pure bending

    B.

     Its mean diameter will decrease

    C.

     Its number of coils will increase

    D.

     All the above

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