A. cAc + m cAsc
B. c(A – Asc) + m cAsc
C. c[A + (m – 1)ASC]
D. All the above
Related Mcqs:
- 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
- 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 - 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 - The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.
A. m = 700/3C
B. m = 1400/3C
C. m = 2800/3C
D. m = 3500/3C - 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 - 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 - [A + (m – 1)ASC] known as equivalent concrete area of R.C.C. is given by______________?
A. Modular ratio method
B. Load factor method
C. Ultimate load method
D. None of these - 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 - 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 %
- 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
