RCC Structures Design Questions Answers - Set 12 - ObjectiveBooks

# Practice Test: Question Set - 12

1. The width of the flange of a T-beam should be less than
(A) One-third of the effective span of the T-beam
(B) Distance between the centers of T-beam
(C) Breadth of the rib plus twelve times the thickness of the slab
(D) Least of the above

2. For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is
(A) 1
(B) 2
(C) 3
(D) 5

3. According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is
(A) 5 kg/cm2
(B) 10 kg/cm2
(C) 15 kg/cm2
(D) 20 kg/cm2

4. The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon
(B) Overall thickness of the rib
(C) Centre to centre distance between T-beams
(D) All the above

5. The maximum shear stress (qmax) in a rectangular beam is
(A) 1.25 times the average
(B) 1.50 times the average
(C) 1.75 times the average
(D) 2.0 times the average

6. If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by
(A) 0.2
(B) 0.3
(C) 0.4
(D) 0.5

7. If K is a constant depending upon the ratio of the width of the slab to its effective span lx 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
(A) K/x (1 + x/d) + bw
(B) Kx (1 - x/l) + bw
(C) Kx (1 + x/l) + bw
(D) All the above

8. The length of the straight portion of a bar beyond the end of the hook, should be at least
(A) Twice the diameter
(B) Thrice the diameter
(C) Four times the diameter
(D) Seven times the diameter

9. If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)
(A) M/100Q
(B) M/10√Q
(C) √(M/Q)
(D) √(M/100Q)

10. If ‘H’ is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is
(A) 0.3 H
(B) 0.4 H
(C) 0.5 H
(D) 0.7 H

11. If Sb, is the average bond stress on a bar of diameter ‘d’ subjected to maximum stress ‘t’, the length of the embedment ‘l’ is given by
(A) l = dt/Sb
(B) l = dt/2Sb
(C) l = dt/3Sb
(D) l = dt/4Sb

12. If diameter of a reinforcement bar is d, the anchorage value of the hook is
(A) 4d
(B) 8d
(C) 12d
(D) 16d

13. As per I.S. 456 - 1978, the pH value of water shall be
(A) Less than 6
(B) Equal to 6
(C) Not less than 6
(D) Equal to 7

14. For M 150 mix concrete, according to I.S. specifications, local bond stress, is
(A) 5 kg/cm2
(B) 10 kg/cm2
(C) 15 kg/cm2
(D) 20 kg/cm2

15. The minimum cube strength of concrete used for a pre-stressed member, is
(A) 50 kg/cm2
(B) 150 kg/cm2
(C) 250 kg/cm2
(D) 350 kg/cm2

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