Concrete Technology MCQs with answers Page - 75

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Admin • 833.24K Points
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Q. To prevent segregation, the maximum height for placing concrete, is

  • (A) 100 cm
  • (B) 125 cm
  • (C) 150 cm
  • (D) 200 cm

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Q. For a simply supported beam of span 15 m, the minimum effective depth to satisfy the vertical deflection limits should be

  • (A) 600 mm
  • (B) 750 mm
  • (C) 900 mm
  • (D) more than 1 m

A

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Q. For compacting plain concrete road surface of thickness less than 20 cm, we use

  • (A) internal vibrator
  • (B) screed vibrator
  • (C) form vibrator
  • (D) none of these

A

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Q. Expansion joints are provided if the length of concrete structures exceeds

  • (A) 10 m
  • (B) 15 m
  • (C) 15 m
  • (D) 45 m

A

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Q. The permissible diagonal tensile stress in reinforced brick work is

  • (A) about 0.1 n/mm²
  • (B) zero
  • (C) 0.3 n/mm² to 0.7 n/mm²
  • (D) about 1.0 n/mm²

A

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Q. Separation of water or water sand cement from a freshly concrete, is known

  • (A) bleeding
  • (B) creeping
  • (C) segregation
  • (D) flooding

A

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Q. The critical section for finding maximum bending moment for footing under masonry wall is located

  • (A) at the middle of the wall
  • (B) at the edge of the wall
  • (C) halfway between the middle and edge of the wall
  • (D) at a distance equal to effective depth of footing from the edge of the wall

A

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Q. Horizontal construction joints in concrete walls are generally provided at

  • (A) soffit level
  • (B) window sill level
  • (C) floor level
  • (D) all the above

A

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Q. Stress strain curve of high tensile steel

  • (A) has a definite yield point
  • (B) does not show definite yield point but yield point is defined by 0.1% proof stress
  • (C) does not show definite yield point but yield point is defined by 0.2% proof stress
  • (D) does not show definite yield point but yield point is defined by 2% proof stress,

A

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Q. Addition of pozzolana to cement causes

  • (A) reduction in permeability
  • (B) loss of heat of hydration
  • (C) reduction in bleeding
  • (D) all the above

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