Concrete Technology (221-240)

Updated: Apr 30, 2020

221.Assertion A : According to IS :456-1978, over-reinforced sections are not permitted.

Reason R : There is ductile failure of over-reinforced sections.

A is true but R is false

222. In the limit state method, balanced design of a reinforced concrete beam gives smallest concrete section and maximum area of reinforcement



223. In limit state design, the limiting value of depth of neutral axis is

0.53 d

224. In limit state design, the maximum limit imposed by IS : 456-1978 on the redistribution of moments in statically indeterminate beams is 30%


225. Percentage of steel for balanced design of a singly reinforced rectangular section by limit state method depends on

i) characteristic strength of concrete

ii) yield strength of steel

iii) modulus of elasticity of steel

226. In reinforced concrete, pedestal is defined as a compression member, whose effective length does not exceed its least lateral dimension by 3 times


227. Maximum strain at the level of compression steel for a rectangular section

having effective cover to compression steel as 'd' and neutral axis depth from

compression face as xu is




228. The diagonal tension which results in ultimate failure due to developmen( of

diagonal tension cracks, depends on

a)shear span

b) effective depth

229. Flexural shear failure in a reinforced concrete beam

i) occurs under large bending moment and less shear force

ii) results in cracks which are normally at 90° with the horizontal

230.


231. A beam whose effective span is I, effective depth is 'd' and overall depth is

'D', shall be deemed to be a deep beam when the ratio of

1/D is less than 2.0 for a continuous beam

1/D is less than 2.5 for a continuous beam

232. The effective span of a deep beam is taken as

a) Centre to centre distance between supports

b) 1.15 times the clear span

c) Smaller of (a) and (b)


233. For a deep beam whose overall depth is 5.0 m and effective span is 6 m , the lever arm for simply supported beam and continuous beam respectively will be

3.2 m and 2.7 m

234. The bending moment at mid span of a square vertical bunker due to a lateral

pressure p per unit area is pl²/24

235. In silo walls, the compressive stress on the net concrete section deducting all

openings should not exceed 0.25 fck

236. Which of the following theory is applicable for design of silo walls ?

Janssen's theory

237. To ensure lateral stability, the clear distance between lateral restraints in case

of simply supported and continuous beam should not exceed

lesser of 60 b or 250 b²/d


238. Consider the following statements in regard to silos and bunkers

i) The horizontal pressure on the wall of a bunker increases linearly with depth

from top.

ii) The ratio of vertical pressure in silos at the time of emptying to that at the

time of filling is less than 1

239. For RCC bridges, the smallest span beyond which the impact factor is same_

for class A or B or AA and 70R loading (wheeled vehicles) is

240.Match List I with List II in connection with moment capacities for different

condition and types of slabs as per yield line theory and select the answer using the codes given below


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