A pre-stressed concrete member__________________?

Related Mcqs:

1. 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

2. 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)

3. 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)

4. In a pre-stressed beam carrying an external load W with a bent tendon is having angle of -stressed load P. The net downward load at the centre is_________________?

   A. W – 2P
   B. W – P
   C. W – P
   D. W – 2P

5. A pre-stressed concrete member is preferred because___________________?

   A. Its dimensions are not decided from the diagonal tensile stress
   B. Large size of long beams carrying large shear force need not be adopted
   C. Removal of cracks in the members due to shrinkage
   D. All the above

6. High strength concrete is used in pre-stressed member________________?

   A. To overcome high bearing stresses developed at the ends
   B. To overcome bursting stresses at the ends
   C. To provide high bond stresses
   D. All the above

7. Pick up the assumption for the design of a pre-stressed concrete member from the following_______________?

   A. A transverse plane section remains a plane after bending
   B. During deformation limits, Hook’s law is equally applicable to concrete as well as to steel
   C. Variation of stress in reinforcement due to changes in external loading is negligible
   D. All the above

8. 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

9. In a pre-stressed member it is advisable to use________________?

   A. Low strength concrete only
   B. High strength concrete only
   C. Low strength concrete but high tensile steel
   D. High strength concrete and high tensile steel

10. If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be_________________?

    A. 5 cm
    B. 10 cm
    C. 15 cm
    D. 20 cm