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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. The factor of safety for

  2. A.

     steel and concrete are same

    B.

     steel is lower than that for concrete

    C.

     steel is higher than that for concrete

    D.

     none of the above


  3. The design yield stress of steel according to IS: 456-1978 is (where fy is the characteristic yield strength of steel)

  4. A.

     0.37 fy

    B.

     0.57 fy

    C.

     0.67 fy

    D.

     0.87 fy


  5. Which of the following statements is incorrect ?

  6. A.

     Higher Vee-Bee time shows lower workability.

    B.

     Higher slump shows higher workability.

    C.

     Higher compacting factor shows higher workability.

    D.

     none of the above


  7. The approximate value of the ratio between direct tensile strength and flexural strength is

  8. A.

     0.33

    B.

     0.5

    C.

     0.75

    D.

     1.0


  9. Workability of concrete is directly proportional to

  10. A.

     Aggregate cement ratio

    B.

     Time of transit

    C.

     Grading of the aggregate

    D.

     All of above


  11. The critical section for finding maximum bending moment for footing under masonry wall is located

  12. A.

     at the middle of the wall

    B.

     at the edge of the wall

    C.

     halfway between the middle and edge of the wall

    D.

     at a distance equal to effective depth of footing from the edge of the wall


  13. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

  14. A.

     compressive and tensile

    B.

     tensile and compressive

    C.

     both compressive

    D.

     both tensile


  15. Critical section for shear in case of flat slabs is at a distance of

  16. A.

     effective depth of slab from periphery of column/drop panel

    B.

     d/2 from periphery of column/capital/ drop panel

    C.

     at the drop panel of slab

    D.

     at the periphery of column


  17. If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

  18. A.

     depends on as, only

    B.

     depends on aCbC only

    C.

     depends on both crst and acbc

    D.

     is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.


  19. The diameter of ties in a column should be

  20. A.

     More than or equal to one fourth of diameter of main bar

    B.

     More than or equal to 5 mm

    C.

     More than 5 mm but less than one-fourth of diameter of main bar

    D.

     More than 5 mm and also more than one-fourth of diameter of main bar