Concrete Technology MCQs with answers Page - 32

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Q. The strength of concrete using air entraining cement gets reduced by

  • (A) 5 to 10%
  • (B) 10 to 15%
  • (C) 15 to 20%
  • (D) 20 to 25%

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Q. A compaction factor of 0.88 indictes that the workability of concrete mix is

  • (A) very low
  • (B) low
  • (C) medium
  • (D) high

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Q. In order to prepare a test specimen, it is necessary to

  • (A) mix the cement and fine aggregate (sand) by dry hand
  • (B) mix the coarse aggregate
  • (C) mix water to the cment, fine aggregate and coarse aggregates
  • (D) all of the above

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Q. In the manufacture of possolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about

  • (A) 20%
  • (B) 30%
  • (C) 40%
  • (D) 50%

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Q. The usual proportion of ingredients in plain cement concrete is

  • (A) Portland cement (1 part), clean sand (1
  • (B) Portland cement (1 part), clean sand (3 to 16 parts) and coarse aggregate (1
  • (C) Porland cement (1 part), clean sand and coarse aggregate (1
  • (D) any one of the above

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Q. The arbitrary mix method, the coarse aggregates are taken twice the fine aggregates.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

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Q. At freezing point, the concrete sets easily.

  • (A) Right
  • (B) Wrong
  • (C) ---
  • (D) ---

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Q. Too much finencess of cement

  • (A) results cracks in concrete
  • (B) generates greater heat
  • (C) develops early strength
  • (D) both (a) and (b)

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Q. In making precast structural units for partition and wall lining purposes, the concrete should be

  • (A) sawdust concrete
  • (B) air-entrained concrete
  • (C) light-weight concrete
  • (D) vacuum concrete

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