Question

When the Projection of a line is parallel to both HP and VP its length will be _______

(a) shortened

(b) false

(c) enlarged

(d) true

I got this question in my homework.

This is a very interesting question from Projection of Straight Lines topic in chapter Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing

Answer 1

The correct answer is (d) true

For explanation: Since the line is parallel to both HP and VP, both the front view a’b’ and the top view ab are in true lengths.  Since the line is perpendicular to the right PP, the left side view of the line will be a point a΄΄(b΄΄). After projection on to the projection planes, the planes are rotated such that all the three projection planes lie in the same planes. The multi-view drawing of line AB is shown in figure b.