Concrete Technology MCQs with answers Page - 82

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Q. If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is

  • (A) p = [(z - x)/(z - y)] × 100
  • (B) p = [(x - z)/(z - y)] × 100
  • (C) p = [(x - z)/(z + y)] × 100
  • (D) p = [(z + x)/(z - y)] × 100

A

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Q. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

  • (A) balanced beam
  • (B) under-reinforced beam
  • (C) over-reinforced beam
  • (D) none of the above

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Q. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

  • (A) fcr - fcs = fcl
  • (B) fcr > fcs > fcl
  • (C) fcr < fcs < fcl
  • (D) fcs > fcr > fcl

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Q. Air entrainment in the concrete increases

  • (A) workability
  • (B) strength
  • (C) the effects of temperature variations
  • (D) the unit weight

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Q. Construction joints are provided

  • (A) where b.m. and s.f. are small
  • (B) where the member is supported by other member
  • (C) at 18 m apart in huge structures
  • (D) all the above

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Q. Maximum distance between expansion joints in structures as per IS: 456 1978 is

  • (A) 20 m
  • (B) 30 m
  • (C) 45 m
  • (D) 60 m

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Q. Ordinary concrete is not used for concrete grade

  • (A) m 100
  • (B) m 150
  • (C) m 250
  • (D) m 400

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Q. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

  • (A) zero
  • (B) tensile
  • (C) compressive
  • (D) tensile or compressive

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Q. An aggregate is said to be flaky, if its least dimension is less than

  • (A) 2/3 mean dimension
  • (B) 3/4 mean dimension
  • (C) 3/5 mean dimension
  • (D) 5/8 mean dimension

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Q. While designing an air entrained concrete

  • (A) water cement ratio is reduced
  • (B) proportion of aggregates is reduced
  • (C) an allowance for the entrained air is made
  • (D) all the above

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