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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. Bulking of sand is maximum if moisture content is about

  2. A.

     2 %

    B.

     4 %

    C.

     6 %

    D.

     10 %


  3. If a beam fails in bond, then its bond strength can be increased most economi-cally by

  4. A.

     increasing the depth of beam

    B.

     using thinner bars but more in number

    C.

     using thicker bars but less in number

    D.

     providing vertical stirrups


  5. For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

  6. A.

     0.75 - 0.80

    B.

     0.80 - 0.85

    C.

     0.85 - 0.92

    D.

     Above 0.92


  7. Ultimate strength of cold drawn high steel wires

  8. A.

     increases with increase in diameter of bar

    B.

     decreases with increase in diameter of bar

    C.

     does not depend on diameter of bar

    D.

     none of the above


  9. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

  10. A.

     10%

    B.

     20%

    C.

     30%

    D.

     40%


  11. The percentage of voids in cement is approximately

  12. A.

     25%

    B.

     40%

    C.

     60%

    D.

     80%


  13. According to Whitney’s theory, ultimate strain of concrete is assumed to be

  14. A.

     0.03%

    B.

     0.1%

    C.

     0.3%

    D.

     3%


  15. The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

  16. A.

     0.15

    B.

     0.12

    C.

     0.30

    D.

     1.00


  17. When shear stress exceeds the permissible limit in a slab, then it is reduced by

  18. A.

     Increasing the depth

    B.

     Providing shear reinforcement

    C.

     Using high strength steel

    D.

     Using thinner bars but more in number


  19. For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be

  20. A.

     600 mm

    B.

     750 mm

    C.

     900 mm

    D.

     more than 1 m