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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. In a spherical dome the hoop stress due to a concentrated load at crown is

  2. A.

     compressive everywhere

    B.

     tensile everywhere

    C.

     partly compressive and partly tensile

    D.

     zero

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  3. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

  4. A.

     there will be no settlement of columns

    B.

     there will be no differential settlement

    C.

     the settlement of exterior columns will be more than interior columns

    D.

     the settlement of interior columns will be more than exterior columns

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  5. If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are

  6. A.

     3.0 m and 1.5 m

    B.

     1.5 m and 3.0 m

    C.

     3.0 m and 3.0 m

    D.

     1.5 m and 1.5 m

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  7. The effect of creep on modular ratio is

  8. A.

     to decrease it

    B.

     to increase it

    C.

     either to decrease or to increase it

    D.

     to keep it unchanged

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  9. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

  10. A.

     100 mm

    B.

     150 mm

    C.

     200 mm

    D.

     250 mm

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  11. The minimum cover to the ties or spirals should not be less than

  12. A.

     15 mm

    B.

     20 mm

    C.

     25 mm

    D.

     50mm

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

  14. A.

     35 MPa and 42 MPa

    B.

     42 MPa and 35 MPa

    C.

     42 MPa and 53 MPa

    D.

     53 MPa and 42 MPa

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

  16. A.

     ±5% of average

    B.

     ± 10% of average

    C.

     ± 15% of average

    D.

     ±20% of average

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  17. Workability of concrete is inversely proportional to

  18. A.

     time of transit

    B.

     vater-cement ratio

    C.

     the air in the mix

    D.

     size of aggregate

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  19. 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

  20. A.

     is always less than 1

    B.

     is always greater than 1

    C.

     can be more than 1

    D.

     can be less than 1

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