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Civil Engineering :: Concrete Technology

  1. Pick up the correct statement from the following:

  2. A.

    Segregation is necessary for a workable concrete

    B.

    Consistency does not affect the workability of concrete

    C.

    If the slump increases, workability decreases

    D.

    If the concrete mix is dry, the slump is maximum

    E.
    None of these.

  3. Specified compressive strengh of concrete is obtained from cube tests at the end of

  4. A.

    3 days

    B.

    7 days

    C.

    14 days

    D.

    21 days

    E.
    28 days.

  5. An aggregate is said to be flaky, if its least dimension is less than

  6. A.
    2/3 mean dimension
    B.

    3/4 mean dimension

    C.

    3/5 mean dimension

    D.

    5/8 mean dimension

    E.

    none of these.


  7.  

    Pick up the incorrect statement from the following:

  8. A.

    A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water

    B.

    The strength of concrete decreases as the water cement ratio increases

    C.

    If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure

    D.

    Good compaction by mechanical vibrtions, increases the strength of concrete

    E.

    None of these.


  9.  

    The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is

  10. A.

    30%

    B.
    40%
    C.

    50%

    D.

    60%.


  11. The final operation of finishing floors, is known as

  12. A.

    screeding

    B.
    floating
    C.

    trowelling

    D.
    finishing
    E.

    all the above.


  13. The internal dimensions of a ware house are 15 m x 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are

  14. A.

    1500 bags

    B.

    2000 bags

    C.

    2500 bags

    D.

    3000 bags

    E.

    4000 bags


  15. For an ordinary Portland cement

  16. A.

    residual does not exceed 10% when sieved through IS Sieve No. 9

    B.

    soundness varies from 5 to 10 mm

    C.

    initial setting time is not less than 30 minutes

    D.

    compressive stress after 7 days, is not less than 175 kg/cm2

    E.

    all the above.


  17. The maximum thickness of concrete floor of a cement warehouse, is

  18. A.

    10 cm

    B.

    15 cm

    C.

    20 cm

    D.

    25 cm

    E.

    30 cm


  19. A construction joint is provided where

  20. A.

    bending moment is small

    B.
    shear force is small
    C.

    the member is supported by other member

    D.

    all the above.