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. 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

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. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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