Concrete Technology MCQs with answers Page - 25

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Q. The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as

  • (A) cyclopean aggregate
  • (B) coarse aggregate
  • (C) fine aggregate
  • (D) all-in-aggregate

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Q. The rate of hydration is

  • (A) directly
  • (B) inversely
  • (C) ---
  • (D) ---

A

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Q. Weight batching is done by

  • (A) spring dial scale
  • (B) platform weighing machine
  • (C) portable weigh batchers
  • (D) all of these

A

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Q. The first compound which reacts with water when mixed with cement is tricalcium aluminate.

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

A

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Q. An aggregate which may contain some moisture in the pores but having dry surface is known as

  • (A) very dry aggregate
  • (B) dry aggregate
  • (C) saturated surface dry aggregate
  • (D) moist aggregate

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Q. Proper curing of cement concrete, is good for its

  • (A) volume stability
  • (B) strength
  • (C) wear resistance
  • (D) all of these

A

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Q. Hydration of cement is due to the chemical action of water with

  • (A) dicalcium silicate
  • (B) tricalcium silicate
  • (C) tricalcium aluminate
  • (D) all of these

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Q. The cement concrete in which high compressive stresses are artificially induced before its actual use, is called

  • (A) plain cement concrete
  • (B) reinforced cement concrete
  • (C) prestressed cement concrete
  • (D) lime concrete

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Q. The fineness modulus of an aggregate is roughly proportional to

  • (A) specific gravity of the aggregate
  • (B) shape of the aggregate
  • (C) average size of particles in the aggregate
  • (D) grading of the aggregate

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Q. The water used for ordinary concrete is equal to 5% by weight of aggregate plus

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

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