Concrete Technology MCQs with answers Page - 33

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Q. Calcareous material used in the manufacture of cement consists of

  • (A) lime stone
  • (B) chalk
  • (C) shells
  • (D) all of these

A

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Q. Los Angeles machine is used to perform the abrasion resistance test of an aggregate.

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

A

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Q. The workability of concrete mix increases with the increase in moisture content.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

A

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Q. Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

A

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Q. According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that

  • (A) the residue does not exceed 10% when sieved through IS sieve No. 9
  • (B) its expansion is not more than 10 mm for unaerated cement
  • (C) its initial setting time is not less than 30 minutes
  • (D) all of the above

A

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Q. The placement of concrete should be discontinued during rainy periods

  • (A) Yes
  • (B) No
  • (C) ---
  • (D) ---

A

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Q. The mixer, which produces a steady stream of concrete as long as it is in operation, is known as

  • (A) non-tilling batch mixer
  • (B) tilting type batch mixer
  • (C) continuous mixer
  • (D) none of these

A

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Q. The cement concrete, from which entrained air and excess water are removed after placing it in position, is called

  • (A) vacuum concrete
  • (B) light weight concrete
  • (C) prestressed concrete
  • (D) sawdust concrete

A

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Q. In the slump test, the maximum size of the aggregate should not exceed 38 mm.

  • (A) Correct
  • (B) Incorrect
  • (C) ---
  • (D) ---

A

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Q. Hydration of cement evolves heat.

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

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