Concrete Technology MCQs with answers Page - 37

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Q. The prevent the cement bags from any possible contact with moisture, the main point that should be kept in mind is that the

  • (A) space between the exterior walls and piles should be 30 cm
  • (B) cement bags should be placed closer together in the piles
  • (C) width and height of the pile should not exceed 3 m and 2.70 m respectively
  • (D) all of the above

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Q. According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of

  • (A) 1 ; 1
  • (B) 1 ; 2
  • (C) 1 ; 3
  • (D) 1 ; 4

A

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Q. Lime when added in excess quantity

  • (A) makes the cement unsound
  • (B) cuses the cement to expand and disintegrate
  • (C) lowers the clinkering temperature of cement
  • (D) both (a) and (b)

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Q. The standard sand now used in India is obtained from

  • (A) Ennore (Chennai)
  • (B) Mumbai
  • (C) Orissa
  • (D) Jaipur

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Q. Initial setting time of ordinary Portland cement is

  • (A) 15 min
  • (B) 30 min
  • (C) 60 min
  • (D) 10 h

A

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Q. The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds

  • (A) 0.5 N / mm2
  • (B) 1 N / mm2
  • (C) 1.5 N / mm2
  • (D) 2 N / mm2

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Q. The diameter of the pipe line used for transportation of concrete by pumps should not exceed

  • (A) 10 cm
  • (B) 20 cm
  • (C) 30 cm
  • (D) 40 cm

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Q. The inert mineral material used for the manufacture of mortars and concretes is

  • (A) cement
  • (B) water
  • (C) aggregate
  • (D) admixture

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Q. Which of the following cements is expected to have the highest compressive strength after 3 days.

  • (A) ordinary Portland cement
  • (B) rapid hardening cement
  • (C) high alumina cement
  • (D) sulphate resisting cement

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Q. In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt in a

  • (A) country kiln
  • (B) continuous flare kiln
  • (C) rotary kiln
  • (D) all of these

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