RCC Structures Design

81. If is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is

  1. 0.3 H
  2. 0.4 H
  3. 0.5 H
  4. 0.7 H

Correct answer: (D)
0.7 H

82. If is the uniformly distributed load on a circular slab of radius fixed at its ends, the maximum positive radial moment at its centre, is

  1. 3WR2/16
  2. 2WR2/16
  3. WR2/16
  4. None of these

Correct answer: (C)
WR2/16

83. If jd is the lever arm and ΣO is the total perimeter of reinforcement of an R.C.C. beam. the stress at the section having Q shear force, is

  1. Q/2jdΣO
  2. Q/3jdΣO
  3. Q/jdΣO
  4. 2 × Q/jdΣO

Correct answer: (C)
Q/jdΣO

84. If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

  1. K/x (1 + x/d) + bw
  2. Kx (1 - x/l) + bw
  3. Kx (1 + x/l) + bw
  4. All the above

Correct answer: (B)
Kx (1 - x/l) + bw

85. If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is

  1. (L/2) (1 - 3/qmax)
  2. (L/3) (1 - 5/qmax)
  3. (L/2) (1 - 5/qmax)
  4. (L/2) (1 - 2/qmax)

Correct answer: (C)
(L/2) (1 - 5/qmax)

86. If l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2acting on strips parallel to l2 and l1 is

  1. w1/w2 = l2l1
  2. w2/w2 = (l2l1)2
  3. w2/w2 = (l2l1)3
  4. w2/w2 = (l2l1)3

Correct answer: (D)
w2/w2 = (l2l1)3

87. If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as

  1. wl2/4
  2. wl2/8
  3. wl2/10
  4. wl2/12

Correct answer: (B)
wl2/8

88. If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

  1. D = 0.00775 aP
  2. D = 0.0775 aP
  3. D = 0.07775 aP
  4. D = 0.775 Pa

Correct answer: (A)
D = 0.00775 aP

89. If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

  1. [(p1 - p2)/2] h
  2. [(p1 - p2)/4] h
  3. [(p1 + p2)/2] h
  4. (p1 - p2)⅔h

Correct answer: (C)
[(p1 + p2)/2] h

90. If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p1, is:

  1. [(p1 - p2)/2] + [(p1 + p2)/2] sin 2θ
  2. [(p1 - p2)/2] + [(p1 + p2)/2] cos 2θ
  3. [(p1 + p2)/2] + [(p1 + p2)/2] cos 2θ
  4. [(p1 + p2)/2] + [(p1 + p2)/2] sin 2θ

Correct answer: (C)
[(p1 + p2)/2] + [(p1 + p2)/2] cos 2θ

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