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. 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

3. 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

4. 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_________________?

   A. d
   B. n
   C. d + n/3
   D. d – n/3

5. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is__________________?

   A. 0.496 %

   B. 0.596 %

   C. 0.696 %

   D. 0.796 %

6. 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

7. 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

8. In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called________________?

   A. Under-reinforced section
   B. Over reinforced section
   C. Economic section
   D. Critical section

9. 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

10. If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is________________?

    A. 200 cm
    B. 300 cm
    C. 150 cm
    D. 100 cm