Question

Lines of sights (projectors) for oblique projection will be ______________

(a) Parallel to each other and perpendicular to projection plane

(b) Not parallel to each other and perpendicular to projection plane

(c) Parallel to each other and inclined to projection plane

(d) Not parallel to each other and inclined to projection plane

I have been asked this question by my college professor while I was bunking the class.

Origin of the question is Oblique Projections topic in portion Oblique & Perspective Projection of Engineering Drawing

Answer 1

Correct choice is (c) Parallel to each other and inclined to projection plane

To explain I would say: When an observer looks towards an object from infinity, the lines of sight will be parallel to each other and inclined to the projection plane in oblique projection, but the lines of sight will be parallel to each other and perpendicular to projection plane in orthographic projection.