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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

  2. A.

     M15

    B.

     M20

    C.

     M10

    D.

     M25

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  3. The purpose of reinforcement in pre-stressed concrete is

  4. A.

     To provide adequate bond stress

    B.

     To resist tensile stresses

    C.

     To impart initial compressive stress in concrete

    D.

     All of the above

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  5. For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is

  6. A.

     3.5 m

    B.

     4 m

    C.

     4.5 m

    D.

     5 m

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  7. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

  8. A.

     tcr – rcs = tct

    B.

     fcr>fcs>fc.

    C.

     fcr<fcs</fcs

    D.

     fc5>fcr>fC

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  9. According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

  10. A.

     The least lateral dimension

    B.

     2 times the least lateral dimension

    C.

     3 times the least lateral dimension

    D.

     4 times the least lateral dimension

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  11. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

  12. A.

     balanced beam

    B.

     under-reinforced beam

    C.

     over-reinforced beam

    D.

     none of the above

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  13. The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

  14. A.

     wR / 4d

    B.

     wR/2d

    C.

     wR/d

    D.

     2wR/d

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  15. Stress strain curve of high tensile steel

  16. A.

     has a definite yield point

    B.

     does not show definite yield point but yield point is defined by 0.1% proof stress

    C.

     does not show definite yield point but yield point is defined by 0.2% proof stress

    D.

     does not show definite yield point but yield point is defined by 2% proof stress,

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  17. While designing the pile as a column, the end conditions are nearly

  18. A.

     both ends hinged

    B.

     both ends fixed

    C.

     one end fixed and other end hinged

    D.

     one end fixed and other end free

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  19. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

  20. A.

     zero

    B.

     tensile

    C.

     compressive

    D.

     tensile or compressive

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