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.Management Sciences
Category: Design of Concrete Structures
The design yield stress of steel according to IS: 456-1978 is_______________?
A. 0.37 fy
B. 0.57 fy
C. 0.67 fy
D. 0.87 fy
where fy is the characteristic yield strength of steel
Prestress loss due to friction occurs________________?
A. only in post-tensioned beams
B. only in pretensioned beams
C. in both post-tensioned and preten-sioned beams
D. none of the above
For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory_______________?
A. is always less than 1
B. is always greater than 1
C. can be more than 1
D. can be less than 1
Air entrainment in the concrete increases________________?
A. workability
B. strength
C. the effects of temperature variations
D. the unit weight
Select the correct statement?
A. Elastic modulus of high tensile steel is nearly the same as that of mild steel
B. Elastic modulus of high tensile steel is more than that of mild steel
C. Carbon percentage in high carbon steel is less than that in mild steel
D. High tensile steel is cheaper than mild steel
Half of the main steel in a simply supported slab is bent up near the support at a distance of x from the center of slab bearing where x is equal to________________?
A. 1/3
B. 1/5
C. 1/7
D. 1/10
where 1 is the span
A T-shaped retaining wall mainly conssits of_________________?
A. one cantilever
B. two cantilevers
C. three cantilevers
D. four cantilevers
Minimum thickness of load bearing RCC wall should be_____________?
A. 50 mm
B. 100 mm
C. 150 mm
D. 200 mm
The maximum value of hoop compression in a dome is given by___________________?
A. wR / 4d
B. wR/2d
C. wR/d
D. 2wR/d
where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome
The strength of concrete after one year as compared to 28 days strength is about_______________?
A. 10 to 15% more
B. 15 to 20% more
C. 20 to 25% more
D. 25 to 50% more
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