The maximum ratio of span to depth of a slab simply supported and spanning in on

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Question
The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is
Options
A. 35
B. 25
C. 30
D. 20
E. 15

Correct Answer

30

RCC Structures Design problems

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1. A pre-stressed concrete member is preferred because
Options
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.

2. If A is the sectional area of a prestressed rectangular beam provided with a tendon prestressed by a force P through its centroidal longitudinal axis, the compressive stress in concrete, is
Options
A.
B.
C.
D.
E.

3. If the neutral axis of a T-beam is below the slab, the relationship between the flange width B, depth of neutral axis n, thickness of the slab ds, effective depth of the beam d, gross area of tensile steel A_t and the modular ratio m may be stated as
Options
A.
B.
C.
D. Bds(n - ds) = mAt(d - n)

4. For a ribbed slab
Options
A. clear spacing between ribs shall not be greater than 4.5 cm
B. width of the rib shall not be less than 7.5 cm
C. overall depth of the slab shall not exceed four times the breadth of the rib
D. all the above.

5. In a prestressed member it is advisable to use
Options
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
E. high strength concrete but low tensile steel

8. After prestressing process is completed, a loss of stress is due to
Options
A. shrinkage of concrete
B. elastic shortening of concrete
C. creep of concrete
D. creep of steel
E. all the above.

9. If A_c, A_sc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and ?_c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is
Options
A. ?_cA_c + m ?_cA_sc
B. ?_c(A - A_sc) + m ?_cA_sc
C. ?_c[A + (m - 1)A_SC]
D. all the above.

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