If the loading on a prestressed rectangular beam, is uniformly distributed, the

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Question
If the loading on a prestressed rectangular beam, is uniformly distributed, the tendon to be provided should be .
Options
A. straight below centroidal axis
B. parabolic with convexity downward
C. parabolic with convexity upward
D. straight above centroidal axis
E. none of these.

Correct Answer

parabolic with convexity downward

RCC Structures Design problems

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1. 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
Options
A. 10 mm
B. 15 mm
C. 20 mm
D. 25 mm
E. 30 mm

2. The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30� and 2000 kg respectively, the effective width of the stem at the bottom, is
Options
A. 51.5
B. 52.5
C. 53.5
D. 54.5
E. 55.5

4. If C is creep coefficient, f is original prestress 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:
Options
A. (1 - C)mf - eE
B. (C - 1)mf + eE
C. (C - 1)mf - eE
D. (1 - C)mf + eE

5. The system in which high tensile alloy steel bars (silica manganese steel) are used as prestressing tendons, is known as
Options
A. Freyssinet system
B. Magnel-Blaton system
C. C.C.L. standard system
D. Lee-McCall system.

6. If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment
Options
A.
B.
C.
D.
E.

9. Pick up the correct statement from the following:
Options
A. Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling
B. Lateral reinforcement prevents the shearing of concrete on diagonal plane
C. Lateral reinforcement stops breaking away of concrete cover, due to buckling
D. Lateral reinforcement in R.C.C. columns, is kept not less than 5 mm diameter
E. All the above.

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