Multiple Choice questions RCC Structure Design - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. The ratio of the breadth to effective depth of a beam is kept
(A) 0.25
(B) 0.50
(C) 0.70
(D) 0.75

2. In a cantilever retaining wall without a heel slab
(A) Thickness of the stem is kept same throughout
(B) Base slab is made 10 cm thicker than the stem
(C) Width of the base slab is kept 0.7 time the total height of the wall
(D) All the above

3. ‘P’ is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The maximum stress ‘f’ in 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)

4. A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
(A) Remains within the flange
(B) Remains below the slab
(C) Coincides the geometrical centre of the beam
(D) None of these

5. For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to
(A) 10
(B) 15
(C) 20
(D) 25

6. A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is
(A) 30
(B) 35
(C) 40
(D) 45

7. The width of the rib of a T-beam, is generally kept between
(A) 1/7 to 1/3 of rib depth
(B) 1/3 to 1/2 of rib depth
(C) 1/2 to 3/4 of rib depth
(D) 1/3 to 2/3 of rib depth

8. A ribbed slab is provided for
(A) A plain ceiling
(B) Thermal insulation
(C) Acoustic insulation
(D) All the above

9. To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is
(A) 0.107 L
(B) 0.207 L
(C) 0.307 L
(D) 0.407 L

10. The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m = 15, the depth of its neutral axis is
(A) 20 cm
(B) 25 cm
(C) 30 cm
(D) 35 cm

11. If the depth of actual neutral axis of a doubly reinforced beam
(A) Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
(B) Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
(C) Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
(D) All the above

12. If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is
(A) [m/(m - r)] d
(B) [m/(m + r)] d
(C) [(m + r)/m] d
(D) [(r - m)/m] d

13. The maximum diameter of a bar used in a ribbed slab, is
(A) 12 mm
(B) 6 mm
(C) 20 mm
(D) 22 mm

14. A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds
(A) 10
(B) 15
(C) 20
(D) 25

15. According to the steel beam theory of doubly reinforced beams
(A) Tension is resisted by tension steel
(B) Compression is resisted by compression steel
(C) Stress in tension steel equals the stress in compression steel
(D) All the above

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