rcc structures design MCQs – Page 9

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

rcc structures design Mcqs

161. Design of R.C.C. cantilever beams, is based on the resultant force at______________?
0

A. Mid span and fixed support

B. Free end

C. Mid span

D. Fixed end

162. In a pre-stressed beam carrying an external load W with a bent tendon is having angle of -stressed load P. The net downward load at the centre is_________________?
0

A. W P

B. W 2P

C. W P

D. W 2P

163. If the permissible compressive stress for a concrete in bending is C kg/m2, the modular ratio is_____________?
0

A. 2300/2C

B. 2800/C

C. 2800/C2

D. 2800/3C

164. If is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is________________?
0

A. 0.7 H

B. 0.4 H

C. 0.5 H

D. 0.3 H

165. If the average bending stress is 6 kg/cm2 for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is__________________?
0

A. 48 d

B. 28 d

C. 38 d

D. 58 d

166. In a beam the local bond stress Sb, is equal to_______________?
0

A. Leaver arm/(Shear force Total perimeter of reinforcement)

B. Shear force/(Leaver arm Total perimeter of reinforcement)

C. Leaver arm/(Bending moment Total perimeter of reinforcement)

D. Total perimeter of reinforcement/(Leaver arm Shear force)

167. If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by_________________?
0

A. 0.5

B. 0.4

C. 0.2

D. 0.3

168. A foundation is called shallow if its depth, is________________?
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A. Equal to its width

B. One-fourth of its width

C. Half of its width

D. Three-fourth of its width

169. The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30 and 2000 kg respectively, the effective width of the stem at the bottom, is_______________?
0

A. 54.5

B. 53.5

C. 51.5

D. 52.5

170. The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is_________________?
0

A. 35

B. 25

C. 40

D. 30

171. The design of a retaining wall assumes that the retained earth________________?
0

A. Is dry

172. On an absolutely rigid foundation base, the pressure will________________?
0

A. Be zero at the centre of the foundation

B. Be uniform

C. Be more at the edges of the foundation

D. Not be uniform

173. If Sb, is the average bond stress on a bar of diameter subjected to maximum stress , the length of the embedment is given by_____________?
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A. l = dt/3Sb

B. l = dt/2Sb

C. l = dt/Sb

D. l = dt/4Sb

174. Piles are usually driven by________________?
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A. Diesel operated hammer

B. Single acting steam hammer

C. Drop hammer

D. All the above

175. If T and R are tread and rise respectively of a stair, then_______________?
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A. R + 2 T = 60

B. 2R + T = 60

C. R + 2 T = 30

D. 2R + T = 30

176. To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is________________?
0

A. 0.207 L

B. 0.407 L

C. 0.107 L

D. 0.307 L

177. If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least________________?
0

A. WL/3P

B. WL /P

C. WL/2P

D. WL/4P

178. If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is______________?
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A. cAc + m cAsc

B. All the above

C. c[A + (m 1)ASC]

D. c(A Asc) + m cAsc

179. The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm 2 respectively. If m = 15, the depth of its neutral axis is_______________?
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A. 25 cm

B. 20 cm

C. 30 cm

D. 35 cm

180. 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________________?
0

A. WL/12 (L D/3)

B. WL/10 (L + 2D/3)

C. WL/12 (L 2D/3)

D. WL/10 (L 2D/3)

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