RCC Structures Design

121. If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is

  1. WR2/16
  2. 2WR2/16
  3. 3WR2/16
  4. Zero

Correct answer: (C)
3WR2/16

122. If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

  1. WL/12 (L - 2D/3)2
  2. WL/10 (L + 2D/3)2
  3. WL/10 (L - 2D/3)2
  4. WL/12 (L - D/3)2

Correct answer: (C)
WL/10 (L - 2D/3)2

123. If 'W' is weight of a retaining wall and 'P' is the horizontal earth pressure, the factor of safety against sliding, is

  1. 1
  2. 1.25
  3. 1.5
  4. 2

Correct answer: (C)
1.5

124. In a beam the local bond stress Sb, is equal to

  1. Shear force/(Leaver arm × Total perimeter of reinforcement)
  2. Total perimeter of reinforcement/(Leaver arm × Shear force)
  3. Leaver arm/(Shear force × Total perimeter of reinforcement)
  4. Leaver arm/(Bending moment × Total perimeter of reinforcement)

Correct answer: (A)
Shear force/(Leaver arm × Total perimeter of reinforcement)

125. In a cantilever retaining wall without a heel slab

  1. Thickness of the stem is kept same throughout
  2. Base slab is made 10 cm thicker than the stem
  3. Width of the base slab is kept 0.7 time the total height of the wall
  4. All the above

Correct answer: (D)
All the above

126. In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at

  1. Less loaded column
  2. More loaded column
  3. A point of the maximum shear force
  4. A point of zero shear force

Correct answer: (D)
A point of zero shear force

127. In a combined footing if shear stress does not exceed 5 kg/cm2, the nominal stirrups provided are

  1. 6 legged
  2. 8 legged
  3. 10 legged
  4. 12 legged

Correct answer: (B)
8 legged

128. In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are:

  1. 6 legged
  2. 8 legged
  3. 10 legged
  4. 12 legged

Correct answer: (D)
12 legged

129. In a doubly-reinforced beam if 'c' and 't' are stresess in concrete and tension rainforcement, 'd' is the effective depth and 'n' is depth of critical neutral axis, the following relationship holds good

  1. mc/t = n/(d - n)
  2. (m + c)/t = n/(d + n)
  3. (t + c)/n = (d + n)/n
  4. mc/t = (d - n)/t

Correct answer: (A)
mc/t = n/(d - n)

130. In a pre-stressed beam carrying an external load W with a bent tendon is having angle of inclination θ and pre-stressed load P. The net downward load at the centre is

  1. W - 2P cos θ
  2. W - P cos θ
  3. W - P sin θ
  4. W - 2P sin θ

Correct answer: (D)
W - 2P sin θ

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