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__________________?

Related Mcqs:

1. According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is_____________?

   A. 5 kg/cm2
   B. 10 kg/cm 2
   C. 15 kg/cm2
   D. 20 kg/cm2

2. If Sb, is the average bond stress on a bar of diameter subjected to maximum stress , the length of the embedment is given by_____________?

   A. l = dt/Sb
   B. l = dt/2Sb
   C. l = dt/3Sb
   D. l = dt/4Sb

3. The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or____________________?

   A. 12 bar diameters
   B. 18 bar diameters
   C. 24 bar diameters
   D. 30 bar diameters

4. For M 150 mix concrete, according to I.S. specifications, local bond stress, is_________________?

   A. 5 kg/cm2
   B. 10 kg/cm 2
   C. 15 kg/cm2
   D. 20 kg/cm2

5. 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

6. 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

7. The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than_______________?

   A. 18 bar diameters
   B. 24 bar diameters
   C. 30 bar diameters
   D. 36 bar diameters

8. A short column 20 cm × 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm2 and 300 kg/cm2, the Safe load on the column, should not exceed_______________?

   A. 4120 kg
   B. 41,200 kg
   C. 412,000 kg
   D. None of these

9. 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

10. For M 150 grade concrete (1:2:4) the moment of resistance factor is_________________?

    A. 0.87
    B. 8.50
    C. 7.50
    D. 5.80