Question

Axisymmetric problems are totally defined in ______

(a) xy planes

(b) yz planes

(c) rz planes

(d) rθ planes

I had been asked this question in an interview for internship.

I'm obligated to ask this question of Axis Symmetric Formulation in section Axis Symmetric Solids Subjected to Axis Symmetric Loading of Finite Element Method

Answer 1

Correct option is (c) rz planes

For explanation I would say: Axial symmetry is symmetry around an axis; an object is axially symmetric if its appearance is unchanged if rotated around an axis. Surface element may refer to an infinitesimal portion of a 2D surface, as used in a surface integral in a 3D space. Thus, the problem needs to be looked at as a two dimensional problem in rz, defined on revolving area.