Question

Which method of development is employed in case of sphere, ellipsoid?

(a) Parallel-line development

(b) Approximation method

(c) Triangulation development

(d) Radial-line development

The question was asked by my college professor while I was bunking the class.

I need to ask this question from Development of Surfaces topic in section Development & Intersection of Surfaces of Engineering Drawing

Answer 1

Right answer is (b) Approximation method

Best explanation: Approximation method is used to develop objects of double curved or warped surfaces as sphere, paraboloid, ellipsoid, hyperboloid and helicoid. Triangulation method is used for transition pieces. This is simply a method of dividing a surface into number of triangles and transferring them into the development.