MCQ on RCC Structures Design - Set 02 - ObjectiveBooks

MCQ on RCC Structures Design - Set 02

Practice Test: Question Set - 02

1. The width of the flange of a L-beam, should be less than
    (A) One-sixth of the effective span
    (B) Breadth of the rib + four times thickness of the slab
    (C) Breadth of the rib + half clear distance between ribs
    (D) Least of the above

2. A pre-stressed concrete member is preferred because
    (A) Its dimensions are not decided from the diagonal tensile stress
    (B) Large size of long beams carrying large shear force need not be adopted
    (C) Removal of cracks in the members due to shrinkage
    (D) All the above

3. If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a
    (A) Simply supported beam
    (B) Continuous beam
    (C) Cantilever beam
    (D) None of these

4. A pile of length ‘L’ carrying a uniformly distributed load ‘W’ per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is
    (A) WL/8
    (B) WL²/24
    (C) WL²/47
    (D) WL²/16

5. If ‘p’ is the net upward pressure on a square footing of side ‘b’ for a square column of side ‘a’, the maximum bending moment is given by
    (A) B.M = pb (c - a)/4
    (B) B.M = pb (b - a)²/4
    (C) B.M = pb (b - a)²/8
    (D) B.M = pb (b + a)/8

6. According to load factor method, the permissible load ‘W’ on a short column reinforced with longitudinal bars and lateral stirrups, is
    (A) Stress in concrete × area of concrete
    (B) Stress in steel × area of steel
    (C) Stress in concrete × area of concrete + Stress in steel × area of steel
    (D) None of these

7. To ensure uniform pressure distribution, the thickness of the foundation, is
    (A) Kept uniform throughout
    (B) Increased gradually towards the edge
    (C) Decreased gradually towards the edge
    (D) Kept zero at the edge

8. If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p1, is:
    (A) [(p₁ - p₂)/2] + [(p₁ + p₂)/2] sin 2θ
    (B) [(p₁ - p₂)/2] + [(p₁ + p₂)/2] cos 2θ
    (C) [(p₁ + p₂)/2] + [(p₁ - p₂)/2] cos 2θ
    (D) [(p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ

9. The maximum permissible size of aggregates to be used in casting the ribs of a slab, is
    (A) 5 mm
    (B) 7.5 mm
    (C) 10 mm
    (D) 15 mm

10. Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
    (A) Are curtailed if not required to resist the bending moment
    (B) Are bent up at suitable places to serve as shear reinforcement
    (C) Are bent down at suitable places to serve as shear reinforcement
    (D) Are maintained at bottom to provide at least local bond stress

11. Steel bars are generally connected together to get greater length than the standard length by providing
    (A) Straight bar splice
    (B) Hooked splice
    (C) Dowel splice
    (D) All the above

12. The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of
    (A) 10 mm
    (B) 15 mm
    (C) 20 mm
    (D) 25 mm

13. Top bars are extended to the projecting parts of the combined footing of two columns distance apart for a distance of
    (A) 0.1 L from the outer edge of column
    (B) 0.1 L from the centre edge of column
    (C) Half the distance of projection
    (D) One-fourth the distance of projection

14. For M 150 grade concrete (1 : 2 : 4) the moment of resistance factor is
    (A) 0.87
    (B) 8.50
    (C) 7.50
    (D) 5.80

15. ‘P’ is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The minimum stress ‘f’ on the beam subjected to a maximum bending moment ‘M’ is
    (A) f = (P/A) - (Z/M)
    (B) f = (A/P) - (M/Z)
    (C) f = (P/A) - (M/Z)
    (D) f = (P/A) - (M/6Z)

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