rcc structures design MCQs – Page 4

Practise focused rcc structures design questions with marked answers for exam preparation and subject revision.

rcc structures design Mcqs

61. In a pre-stressed member it is advisable to use________________?
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A. High strength concrete and high tensile steel

B. Low strength concrete but high tensile steel

C. High strength concrete only

D. Low strength concrete only

62. Long and short spans of a two way slab are l and l and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. Accordingy to xRankine Grashoff theory___________________?
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A. (wx/wy) = (ly/lx)

B. None of these

C. (wx/wy) = (ly/lx)4

D. (wx/wy) = (ly/lx)

63. If the length of a combined footing for two columns l metres apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where is the distance of centre of gravity of column loads______________?
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A. y = L/2 (l + )

B. y = L/2 + (l

C. y = L (l ) )

D. y = L/2 (l )

64. carrying a uniformly distributed load per metre length is suspended at two A pile of length points, the maximum, B.M. at the centre of the pile or at the points of suspension, is_________________?
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A. WL/16

B. WL/47

C. WL/8

D. WL/24

65. The minimum head room over a stair must be_______________?
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A. 200 cm

66. The Youngs modulus of elasticity of steel, is__________________?
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A. 250 KN/mm2

B. 150 KN/mm2

C. 275 KN/mm2

D. 200 KN/mm2

67. the column head support a flat slab, is generally kept The diameter of_____________?
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A. 5.0 cm larger than the diameter of the column

B. 4.0 cm larger than the diameter of the column

C. 0.25 times the diameter of the column

D. 0.25 times the span length

68. For initial estimate for a beam design, the width is assumed__________________?
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A. 1/15th of span

B. 1/25th of span

C. 1/20th of span

D. 1/30th of span

69. If the shear stress in a R.C.C. beam is_______________?
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A. Equal or less than 5 kg/cm2, no shear reinforcement is provided

70. The percentage of minimum reinforcement of the gross sectional area in slabs, is________________?
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A. 0.15 %

B. 0.10%

C. 0.18%

D. 0.12%

71. If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is________________?
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A. WR/16

B. 3WR/16

C. Zero

D. 2WR/16

72. 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________________?
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A. D = 0.00775 aP

B. D = 0.07775 aP

C. D = 0.775 Pa

D. D = 0.0775 aP

73. A raft foundation is provided if its area exceeds the plan area of the building by______________?
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A. 50 %

B. 40%

C. 20%

D. 10%

74. The amount of reinforcement for main bars in a slab, is based upon___________________?
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A. Maximum bending moment

B. Minimum bending moment

C. Minimum shear force

D. Maximum shear force

75. [A + (m 1)ASC] known as equivalent concrete area of R.C.C. is given by______________?
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A. Ultimate load method

B. Load factor method

C. None of these

D. Modular ratio method

76. The ratio of the breadth to effective depth of a beam is kept_______________?
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A. 0.7

B. 0.75

C. 0.50

D. 0.25

77. The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm2, safe shear stress 5 kg/cm2 and B.M. 24 mt________________?
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A. Is over safe in shear

B. Is safe in shear

C. Needs redesigning

D. Is unsafe in shear

78. The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is_______________?
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A. 190 kg/cm2

B. 1400 kg/cm2

C. 230 kg/cm2

D. 260 kg/cm2

79. In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called________________?
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A. Over reinforced section

B. Critical section

C. Under-reinforced section

D. Economic section

80. Cantilever retaining walls can safely be used for a height not more than_______________?
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A. 3 m

B. 5 m

C. 4 m

D. 6 m

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