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Civil Engineering :: Concrete Technology

  1. Concrete containing

  2. A.
    silicious aggregates, has higher co-efficient of expansion
    B.

    igneous aggregates, has intermediate coefficient of expansion

    C.

    lime stones, has lowest co-efficient of expansion

    D.

    All the above.


  3. An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No. 9, more than

  4. A.

    5%

    B.

    10%

    C.

    15%

    D.

    20%

    E.
    25%

  5. The top diameter, bottom diameter and the height of a slump mould are :

  6. A.

    10 cm, 20 cm, 30 cm

    B.

    10 cm, 30 cm, 20 cm

    C.

    20 cm, 10 cm, 30 cm

    D.

    20 cm, 30 cm, 10 cm

    E.

    30 cm, 20 cm, 10 cm


  7. Workability of concrete mix with low water cement ratio is determined by

  8. A.

    tensile strength test

    B.

    slump test

    C.

    compaction factor test

    D.

    flexural strength test

    E.

    none of these.


  9.  

    While designing an air entrained concrete

  10. A.
    water cement ratio is reduced
    B.

    proportion of aggregates is reduced

    C.

    an allowance for the entrained air is made

    D.

    strength of the concrete, is reduced

    E.

    all the above.


  11.  

    Pick up the incorrect statemnt from the following. For performing compressive strength test of cement

  12. A.
    cement and standard sand mortar are used in the ratio of 1 : 3
    B.
    water is added at the rate of  + 3.0 percentage of water where P is the percentage of water for standard consistency
    C.
    A cube mould of 10 cm x 10 cm x 10 cm is used
    D.
    The perpared moulds are kept in a atmosphere of 50% relative humidity
    E.

  13. For concreting tunnel linings, tran-portation of concrete is done by

  14. A.

    pans

    B.
    wheel borrows
    C.

    containers

    D.

    pumps

    E.
    belt conveyors.

  15. The operation of removing humps and hollows of uniform concrete surface, is known as

  16. A.

    floating

    B.
    screeding
    C.

    trowelling

    D.

    finishing

    E.
    none of these.

  17. The void ratio of

  18. A.
    single size coarse aggregate is roughly 0.45.
    B.
    graded coarse aggregate is roughly 0.040
    C.
    fine aggregate is roughly 0.45
    D.
    all the above.

  19. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

  20. A.
    rounded aggregate
    B.
    irregular aggregate
    C.
    angular aggregate
    D.
    flaky aggregate
    E.
    none of these.