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Civil Engineering :: RCC Structures Design

  1. The maximum area of tension reinforcement in beams shall not exceed

  2. A.

     0.15 %

    B.

     1.5 %

    C.

     4 %

    D.

     1 %


  3. An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 meters and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is

  4. A.

     8.3 kg/cm²

    B.

     7.6 kg/cm²

    C.

     21.5 kg/cm²

    D.

     11.4 kg/cm²


  5. Lapped splices in tensile reinforcement are generally not used for bars of size larger than

  6. A.

     18 mm diameter

    B.

     24 mm diameter

    C.

     30 mm diameter

    D.

     36 mm diameter


  7. After pre-stressing process is completed, a loss of stress is due to

  8. A.

     Shrinkage of concrete

    B.

     Elastic shortening of concrete

    C.

     Creep of concrete

    D.

     All the above


  9. If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be

  10. A.

     5 cm

    B.

     10 cm

    C.

     15 cm

    D.

     20 cm


  11. If the size of a column is reduced above the floor, the main bars of the columns, are

  12. A.

     Continued up

    B.

     Bent inward at the floor level

    C.

     Stopped just below the floor level and separate lap bars provided

    D.

     All the above


  13. For initial estimate for a beam design, the width is assumed

  14. A.

     1/15th of span

    B.

     1/20th of span

    C.

     1/25th of span

    D.

     1/30th of span


  15. [A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by

  16. A.

     Modular ratio method

    B.

     Load factor method

    C.

     Ultimate load method

    D.

     None of these


  17. The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm², safe shear stress 5 kg/cm² and B.M. 24 mt,

  18. A.

     Is safe in shear

    B.

     Is unsafe in shear

    C.

     Is over safe in shear

    D.

     Needs redesigning


  19. The maximum diameter of a bar used in a ribbed slab, is

  20. A.

     12 mm

    B.

     6 mm

    C.

     20 mm

    D.

     22 mm