The percentage of minimum reinforcement of the gross sectional area in slabs, is________________?

Related Mcqs:

1. is the pre- stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on the beam subjected to a maximum bending moment is________________?

   A. f = (P/A) – (Z/M)
   B. f = (A/P) – (M/Z)
   C. f = (P/A) – (M/Z)
   D. f = (P/A) – (M/6Z)

2. Minimum spacing between horizontal parallel reinforcement of the same size should not be less than________________?

   A. One diameter
   B. 2.5 diameters
   C. 3 diameters
   D. 3.5 diameters

3. Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than________________?

   A. One diameter of thinner bar
   B. One diameter of thicker bar
   C. Twice the diameter of thinner bar
   D. None of these

4. According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is______________?

   A. Half of the width of the slab
   B. Two -third of the width of the slab
   C. Three-fourth of the width of the slab
   D. Four-fifth of the width of the slab

5. If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm2, the length of the beam having nominal reinforcement, is________________?

   A. 8 cm
   B. 6 m
   C. 8 m
   D. 10 m

6. The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of___________________?

   A. 10 mm
   B. 15 mm
   C. 20 mm
   D. 25 mm

7. 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

8. If the tendon is placed at an rectangular beam (sectional top edge)________________?

   A. Is increased by PZ/e
   B. Is increased by Pe/Z
   C. Is decreased by Pe/Z
   D. Remains unchanged

9. is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is_________________?

   A. f = (P/A) + (Z/M)
   B. f = (A/P) + (M/Z)
   C. f = (P/A) + (M/Z)
   D. f = (P/A) + (M/6Z)

10. The minimum cube strength of concrete used for a pre-stressed member, is________________?

    A. 50 kg/cm2
    B. 150 kg/cm 2
    C. 250 kg/cm2
    D. 350 kg/cm2