Concrete Technology MCQs with answers Page - 63

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Q. Addition of pozzolana to ordinary port land cement, causes

  • (A) decrease in early strength
  • (B) reduction in chemical action with sulphates
  • (C) increase in shrinkage
  • (D) all the above

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Q. Pick up the correct statement from the following:

  • (A) the maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm
  • (B) the maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm
  • (C) the material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt
  • (D) all the above

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Q. For construction of structures in sea water, the cement generally preferred to, is

  • (A) portland-pozzolana cement
  • (B) quick setting cement
  • (C) low heat portland cement
  • (D) rapid hardening cement

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Q. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

  • (A) compressive and tensile
  • (B) tensile and compressive
  • (C) both compressive
  • (D) both tensile

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Q. After casting, an ordinary cement concrete on drying

  • (A) expands
  • (B) mix
  • (C) shrinks
  • (D) none of these

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Q. The most commonly used admixture which prolongs the setting and hardening time is

  • (A) gypsum
  • (B) calcium chloride
  • (C) sodium silicate
  • (D) all of the above

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Q. For given water content, workability decreases if the concrete aggregates contain an excess of

  • (A) thin particles
  • (B) flat particles
  • (C) elongated particles
  • (D) all the above

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Q. The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known

  • (A) grading
  • (B) curing
  • (C) mixing
  • (D) batching

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Q. The load factors for live load and dead load are taken respectively as

  • (A) 1.5 and 2.2
  • (B) 2.2 and 1.5
  • (C) 1.5 and 1.5
  • (D) 2.2 and 2.2

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Q. The mixture of different ingredients of cement, is burnt at

  • (A) 1000°c
  • (B) 1200°c
  • (C) 1400°c
  • (D) 1600°c

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