The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.

Related Mcqs:

1. If the permissible compressive stress for a concrete in bending is C kg/m2, the modular ratio is_____________?

   A. 2800/C
   B. 2300/2C
   C. 2800/3C
   D. 2800/C2

2. If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is______________?

   A. cAc + m cAsc
   B. c(A – Asc) + m cAsc
   C. c[A + (m – 1)ASC]
   D. All the above

3. 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 %

4. 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

5. 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

6. If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young’s modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is________________?

   A. (1 – C) mf – eE
   B. (C – 1)mf + eE
   C. (C – 1)mf – eE
   D. (1 – C)mf + eE

7. 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

8. If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre -stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is_______________?

   A. P/A
   B. A/P
   C. P/2A
   D. 2A/P

9. 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

10. The maximum shear stress (q) in concrete of a reinforced cement concrete beam is_____________?

    A. Shear force/(Lever arm × Width)
    B. Lever arm/(Shear force × Width)
    C. Width/(Lever arm × Shear force)
    D. (Shear force × Width)/Lever arm