# Civil Engineering - Theory of Structures

### Exercise :: Theory of Structures - Section 1

21.

In case of a simply supported rectangular beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is

 A. B. C. D. E. Explanation:

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22.

Pick up the correct statement from the following:

 A. Hoop strain of the walls of a cylinder due to liquid is B. Longitudinal strain in the walls of a cylinder due to liquid is C. Volumetric change in the cylinderdue to liquid is D. All the above.

Explanation:

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23.

A material may fail if

 A. maximum principal stress exceeds the direct stress σ0 B. maximum strain exceeds C. maximum shear stress exceeds D. total strain energy exceeds E. all the above.

Explanation:

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24.

A truss containing j joints and m members, will be a simple truss if

 A. m = 2j - 3 B. j = 2m - 3 C. m = 3j - 2 D. j = 3m - 2

Explanation:

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25.

The stiffness of the close coil helical spring is

 A. B. C. D. 