effective depth and depth of the neutral axis respectively of a singly reinforced If d and n are the beam, the lever arm of the beam, is_________________?

Related Mcqs:

1. A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is____________________?

   A. bn (fc/2) (d – n/3)
   B. Atft (d – n/3)
   C. ½ n1 (1 – n1/3) cbd²
   D. All the above

2. A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, is_________________?

   A. 20 cm
   B. 25 cm
   C. 30 cm
   D. 35 cm

3. 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/cm 2 respectively. If m = 15, the depth of its neutral axis is_______________?

   A. 20 cm
   B. 25 cm
   C. 30 cm
   D. 35 cm

4. In a doubly-reinforced beam if and the effective depth and is depth of critical neutral axis, the following relationship holds good______________?

   A. mc/t = n/(d – n)
   B. (m + c)/t = n/(d + n)
   C. (t + c)/n = (d + n)/n
   D. mc/t = (d – n)/t

5. 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

6. 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

7. If the modular ratio is , steel ratio is and overall depth of a beam is , 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

8. An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is_______________?

   A. 8.3 kg/cm2
   B. 7.6 kg/cm2
   C. 21.5 kg/cm 2
   D. 11.4 kg/cm2

9. 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 cm 2
   B. 15 cm2
   C. 16 cm2
   D. 17 cm2

10. In a singly reinforced beam, the effective depth is measured from its compression edge to_________________?

    A. Tensile edge
    B. Tensile reinforcement
    C. Neutral axis of the beam
    D. Longitudinal central axis