RCC Structures Design Objective Questions and Answers - ObjectiveBooks

# Practice Test: Question Set - 15

1. [A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by
(A) Modular ratio method
(D) None of these

2. A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is
(A) 14 cm2
(B) 15 cm2
(C) 16 cm2
(D) 17 cm2

3. The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is
(A) 30°
(B) 40°
(C) 45°
(D) All the above

4. If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be
(A) 5 cm
(B) 10 cm
(C) 15 cm
(D) 20 cm

5. If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is
(A) 37 cm
(B) 38 cm
(C) 39 cm
(D) 40 cm

6. The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm2, safe shear stress 5 kg/cm2 and B.M. 24 mt,
(A) Is safe in shear
(B) Is unsafe in shear
(C) Is over safe in shear
(D) Needs redesigning

7. 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
(A) WL/P
(B) WL/2P
(C) WL/3P
(D) WL/4P

8. If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is
(A) 40
(B) 45
(C) 50
(D) 55

9. 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
(A) WL/12 (L - 2D/3)²
(B) WL/10 (L + 2D/3)²
(C) WL/10 (L - 2D/3)²
(D) WL/12 (L - D/3)²

10. Piles are usually driven by
(A) Diesel operated hammer
(B) Drop hammer
(C) Single acting steam hammer
(D) All the above

11. A circular slab subjected to external loading, deflects to form a
(A) Semi-hemisphere
(B) Ellipsoid
(C) Paraboloid
(D) None of these

12. In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
(C) A point of the maximum shear force
(D) A point of zero shear force

13. 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
(A) 28 d
(B) 38 d
(C) 48 d
(D) 58 d

14. The live load to be considered for an inaccessible roof, is
(A) Nil
(B) 75 kg/m2
(C) 150 kg/cm2
(D) 200 kg/m2

15. A pile of length ‘L’ carrying a uniformly distributed load ‘W’ per metre length is suspended at the centre and from other two points 0.15 L from either end ; the maximum hogging moment will be
(A) WL²/15
(B) WL²/30
(C) WL²/60
(D) WL²/90

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