Question

The hidden parts inside or back side of object while represented in orthographic projection are represented by which line?

(a) Continuous thick line

(b) Continuous thin line

(c) Dashed thin line

(d) Long-break line

The question was asked in semester exam.

This interesting question is from Basics of Orthographic Projections topic in chapter Loci of Points & Orthographic Projections of Engineering Drawing

Answer 1

Correct answer is (c) Dashed thin line

To explain I would say: Continuous thick line is used for visible outlines, visible edges, crests of screw threads, limits of full depth thread etc. Continuous thin line is used for extension, projection, short centre, leader, reference lines, imaginary lines of intersection etc.