Concrete Technology MCQs with answers Page - 76

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Q. Which of the following losses of pre-stress occurs only in pre-tensioning and not in posttensioning?

  • (A) elastic shortening of concrete
  • (B) shrinkage of concrete
  • (C) creep of concrete
  • (D) loss due to friction

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

  • (A) rounded spherical
  • (B) irregular
  • (C) flaky
  • (D) none of these

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Q. Pre-stress loss due to friction occurs

  • (A) only in post-tensioned beams
  • (B) only in pre-tensioned beams
  • (C) in both post-tensioned and pre-tensioned beams
  • (D) none of the above

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Q. In the method of voids for determination of the quantity of cement paste, it is assumed that

  • (A) voids in coarse aggregates are filled by fine aggregates
  • (B) voids in fine aggregates are filled by the cement paste
  • (C) volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
  • (D) all the above

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Q. As compared to ordinary Portland cement, use of pozzolana cement

  • (A) reduces workability
  • (B) increases bleeding
  • (C) increases shrinkage
  • (D) increases strength

A

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Q. The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning

  • (A) 1 : 1 : 2
  • (B) 1 : 2 : 4
  • (C) 1 : 3 : 6
  • (D) 1 : 4 : 10

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Q. The strength and quality of concrete, depend upon:

  • (A) grading of aggregates
  • (B) surface area of aggregates
  • (C) shape of aggregates
  • (D) all the above

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Q. The factor of safety for

  • (A) steel and concrete are same
  • (B) steel is lower than that for concrete
  • (C) steel is higher than that for concrete
  • (D) none of the above

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Q. The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds

  • (A) 5 kg/cm2
  • (B) 8 kg/cm2
  • (C) 10 kg/cm2
  • (D) 15 kg/cm2

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Q. Setting time of cement increases by adding

  • (A) gypsum
  • (B) hydrogen peroxide
  • (C) calcium chloride
  • (D) sodium oxide

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