A. Is increased by PZ/e
B. Is increased by Pe/Z
C. Is decreased by Pe/Z
D. Remains unchanged
Related Mcqs:
- 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) - 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) - 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 - 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 - 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 - 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 - A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis______________?
A. Remains within the flange
B. Remains below the slab
C. Coincides the geometrical centre of the beam
D. None of these - Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as__________________?
A. 1/8th of the span
B. 1/10th of the span
C. 1/12th of the span
D. 1/16th of the span - 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 - 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
