# Civil Engineering - RCC Structures Design

### Exercise :: RCC Structures Design - Section 3

11.

According to the steel beam theory of doubly reinforced beams

 A. tension is resisted by tension steel B. compression is resisted by compression steel C. stress in tension steel equals the stress in compression steel D. no stress is developed in compression concrete as well as in tension concrete E. all the above.

Explanation:

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12.

The thickness of the flange of a Tee beam of a ribbed slab is assumed as

 A. width of the rib B. depth of the rib C. thickness of the concrete topping 0d) half the thickness of the rib D. twice the width of the rib.

Explanation:

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13.

In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called

 A. under-reinforced section B. over reinforced section C. economic section D. critical section.

Explanation:

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14.

The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

 A. 12 bar diameters B. 18 bar diameters C. 24 bar diameters D. 30 bar diameters E. 36 bar diameters

Explanation:

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15.

If At is the gross area of steel in tension, d is the effective depth of the beam and y is the depth of the centre of gravity of the resultant compression, the moment of resistance M of the beam, is given by

 A. M = At(d - y) B. M = Atf(d - y) C. M = Atf(d + y) D. M = E. none of these.