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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. According to IS: 456-1978, the maximum reinforcement in a column is

  2. A.

     2 %

    B.

     4%

    C.

     6 %

    D.

     8 %


  3. Minimum pitch of transverse reinforcement in a column is

  4. A.

     the least lateral dimension of the member

    B.

     sixteen times the smallest diameter of longitudinal reinforcement bar to be tied

    C.

     forty-eight times the diameter of transverse reinforcement

    D.

     lesser of the above three values


  5. In case of hand mixing of concrete, the extra cement to be added is

  6. A.

     5%

    B.

     10%

    C.

     15%

    D.

     20%


  7. Increase in the moisture content in concrete

  8. A.

     reduces the strength

    B.

     increases the strength

    C.

     does not change the strength

    D.

     all of the above


  9. Which of the following statements is incorrect?

  10. A.

     Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%

    B.

     Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm

    C.

     Reinforcing bars in a column should not be less than 12 mm in diameter

    D.

     The number of longitudinal bars provided in a circular column should not be less than four


  11. Prestress loss due to friction occurs

  12. A.

     only in post-tensioned beams

    B.

     only in pretensioned beams

    C.

     in both post-tensioned and preten-sioned beams

    D.

     none of the above


  13. The limits of percentage p of the longitudinal reinforce-ment in a column is given by

  14. A.

     0.15% to 2%

    B.

     0.8% to 4%

    C.

     0.8% to 6%

    D.

     0.8% to 8%


  15. Air entrainment in the concrete increases

  16. A.

     workability

    B.

     strength

    C.

     the effects of temperature variations

    D.

     the unit weight


  17. The property of the ingredients to separate from each other while placing the concrete is called

  18. A.

     segregation

    B.

     compaction

    C.

     shrinkage

    D.

     bulking


  19. Most common method of prestressing used for factory production is

  20. A.

     Long line method

    B.

     Freyssinet system

    C.

     Magnel-Blaton system

    D.

     Lee-Macall system