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  • Question
  • The concrete is deemed not to comply with the strength requirements if the strength is less than the greater of


  • Options
  • A. characteristic strength minus 1.35 times the standard deviation
  • B. 0.8 times the characteristic strength
  • C. the average strength of all the samples is less than the characteristic strength plus The concrete is deemed not to comply with the strength requirements if the strength is less than the times the standard deviation.
  • D. all the above.

  • Correct Answer
  • all the above. 


  • Structural Design Specifications problems


    Search Results


    • 1. For heavily reinforced concrete member, the nominal maximum size of the aggregates should be restricted to

    • Options
    • A. 5 mm less than the minimum clear distance between the main bars
    • B. 5 mm less than the minimum cover to the reinforcement
    • C. smaller of (a) and (b)
    • D. greater of (a) and (b)
    • Discuss
    • 2. The value of fbct in the formula for calculating the thickness of a Rectangular base, according to IS : 800-1982, is

    • Options
    • A. 1500 kg/cm2
    • B. 1650 kg/cm2
    • C. 1800kg/cm2
    • D. 1890 kg/cm2
    • Discuss
    • 3. The minimum pitch i.e., the distance between centres of rivet holes is not less than

    • Options
    • A. 1.5 times the hole diameter
    • B. 2.0 times the hole diameter
    • C. 2.5 times the hole diameter
    • D. 3.0 times the hole diameter
    • E. None of these.
    • Discuss
    • 4. If D is the overall thickness of the slab, the diameter of the reinforcing bars should not exceed

    • Options
    • A.
    • B.
    • C.
    • D.
    • E.
    • Discuss
    • 5. The minimum compressive strength on 15 cm cubes of M 30 grade concrete at 7 days, should be a minimum of

    • Options
    • A. 7 N/mm2
    • B. 10 N/mm2
    • C. 20 N/mm2
    • D. 30 N/mm2
    • Discuss
    • 6. In case of continuous beams, the distance between the points of zero moment, may be obtained as (where l is the effective span).

    • Options
    • A. 0.5 l
    • B. 0.6 l
    • C. 0.7 l
    • D. 0.8 l
    • Discuss
    • 7. If a column is subjected to dead load and super imposed load only, the maximum ratio should not be greater than

    • Options
    • A. 180
    • B. 250
    • C. 350
    • D. 400
    • Discuss
    • 8. The creep coefficient i.e. the ratio of ultimate creep and elastic strain after

    • Options
    • A. 7 days is 2.2
    • B. 28 days is 1.6
    • C. 365 days is 1.1
    • D. all the above.
    • Discuss
    • 9. The maximum deflection of a structure should not normally exceed lesser of the span/350 or

    • Options
    • A. 10 mm
    • B. 15 mm
    • C. 20 mm
    • D. 25 mm
    • Discuss
    • 10. The depth 'd' of webs without horizontal stiffeners and consisting of tongue plates is taken lesser than the depth of the girder between the flanges less the sum of the depth of the tongue plates, and

    • Options
    • A. eight times the sum of the thickness of tongue plates
    • B. six times the sum of the thickness of tongue plates
    • C. four times the sum of the thickness of tongue plates
    • D. None of the above.
    • Discuss


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