Concrete Technology MCQs with answers Page - 12

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A

Admin • 833.24K Points
Coach

Q. What is the amount used of plasticizers in cement by weight?

  • (A) 0
  • (B) 1-.4%
  • (C) 1%
  • (D) 1-2%

A

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Q. What is the allowed reduction of water with super plasticizers without reducing workability?

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

A

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Coach

Q. What is accelerator?

  • (A) Which speed up the initial set of concrete
  • (B) Which delays the initial set of concrete
  • (C) Which speed up the final set of concrete
  • (D) Which delays the final set of concrete

A

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Q. What is retender?

  • (A) Which speed up the initial set of concrete
  • (B) Which delays the initial set of concrete
  • (C) Which speed up the final set of concrete
  • (D) Which delays the final set of concrete

A

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Q. NaOH is the example of retenders.

  • (A) True
  • (B) False
  • (C) none
  • (D) all

A

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Coach

Q. Pick up the correct statement from the following.

  • (A) Calcium fluosilicates act as a retarders
  • (B) CaCl2 acts as a retarders
  • (C) Gypsum acts as a retarders
  • (D) Gypsum acts as an accelerators

A

Admin • 833.24K Points
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Q. Retarders used at grouting oil wells, where temperature is about _____________ oC.

  • (A) 100
  • (B) 150
  • (C) 200
  • (D) 250

A

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Coach

Q. Silica fume is ______________

  • (A) Less reactive
  • (B) Neutral
  • (C) More reactive
  • (D) Absent in concrete

A

Admin • 833.24K Points
Coach

Q. What is the content of SiO2 in fly ash?

  • (A) 30-60%
  • (B) 15-30%
  • (C) Up to 30%
  • (D) 1-7%

A

Admin • 833.24K Points
Coach

Q. Air entrainment in concrete increases ___________

  • (A) Strength
  • (B) Workability
  • (C) The effect of temp variations
  • (D) The unit weight

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