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Concrete Technology - Section 3

  1. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is
    2. A.
    1 : 3 : 6
    B.
    1 : 1\(\frac { 1 } { 2 } \) : 3
    C.
    1 : 2 : 4
    D.
    1 : 1 : 2
    E.
    1 : 4 : 8.

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  2. The type of aggregates of same nominal size, which contain less voids when compacted, are
    3. A.

    rounded spherical
    B.

    irregular
    C.

    flaky
    D.

    none of these.

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  3. For the construction of cement con-certe dams, the maximum permissible size of the aggregates, is

    4. A.

    40 mm
    B.
    50 mm
    C.

    60 mm
    D.

    70 mm
    E.
    80 mm

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  4. Permissible compressive strength of M 200 concrete grade is
    5. A.

    100 kg/cm2
    B.

    150 kg/cm2
    C.
    200 kg/cm2
    D.

    250 kg/cm2
    E.

    300 kg/cm2

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  5. For preparing a test-specimen, it is necessary
    6. A.

    to mix cement and fine aggregate by dry hand
    B.

    to mix coarse aggregates
    C.

    to mix water to the cement, fine aggregates and coarse aggregates
    D.

    to oil inner surface of the mould and the base plate, before placing concrete
    E.

    all the above.

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