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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

  2. A.

     35 MPa and 42 MPa

    B.

     42 MPa and 35 MPa

    C.

     42 MPa and 53 MPa

    D.

     53 MPa and 42 MPa


  3. The individual variation between test strength of sample should not be more than

  4. A.

     ±5% of average

    B.

     ± 10% of average

    C.

     ± 15% of average

    D.

     ±20% of average


  5. Workability of concrete is inversely proportional to

  6. A.

     time of transit

    B.

     vater-cement ratio

    C.

     the air in the mix

    D.

     size of aggregate


  7. For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory

  8. A.

     is always less than 1

    B.

     is always greater than 1

    C.

     can be more than 1

    D.

     can be less than 1


  9. To determine the modulus of rupture, the size of test specimen used is

  10. A.

     150 x150 x500 mm

    B.

     100 x100 x700 mm

    C.

     150 x150 x700 mm

    D.

     100 x100 x500 mm


  11. High carbon content in the steel causes

  12. A.

     decrease in tensile strength but increase in ductility

    B.

     increase in tensile strength but decrease in ductility

    C.

     decrease in both tensile strength and ductility

    D.

     increase in both tensile strength and ductility


  13. The slab is designed as one way if the ratio of long span to short span is

  14. A.

     less than 1

    B.

     between 1 and 1.5

    C.

     between 1.5 and 2

    D.

     greater than 2


  15. A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

  16. A.

     1.5

    B.

     2.0

    C.

     2.5

    D.

     3.0


  17. According to IS : 456- 1978, minimum slenderness ratio for a short column is

  18. A.

     less than 12

    B.

     less than 18

    C.

     between 18 and 24

    D.

     more than 24


  19. Maximum percentage reinforcement in case of slabs is limited to

  20. A.

     2

    B.

     4

    C.

     6

    D.

     8