Related Mcqs:

1. 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)

2. A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is_____________________?

   A. WL/P
   B. WL/2P
   C. WL/3P
   D. WL/4P

3. 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)

4. 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

5. 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

6. If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be________________?

   A. 8hp/ l
   B. 8hp/l²
   C. 8hl/p
   D. 8hl/p²

7. If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least________________?

   A. WL /P
   B. WL/2P
   C. WL/3P
   D. WL/4P

8. If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon to be provided should be_______________?

   A. Straight below centroidal axis
   B. Parabolic with convexity downward
   C. Parabolic with convexity upward
   D. Straight above centroidal axis

9. In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed________________?

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

10. carrying a uniformly distributed load per metre length is suspended at two A pile of length points, the maximum, B.M. at the centre of the pile or at the points of suspension, is_________________?

    A. WL/8
    B. WL²/24
    C. WL²/47
    D. WL²/16