Question

The positive vertical plane and positive horizontal plane makes _______ angle with each other in anti clockwise direction.

(a) 180 degrees

(b) 270 degrees

(c) 0 degrees

(d) 90 degrees

I have been asked this question in unit test.

Question is from Planes of Projections and Four Quadrants topic in division Loci of Points & Orthographic Projections of Engineering Drawing

Answer 1

Right option is (b) 270 degrees

For explanation I would say: Given the direction is anti-clockwise direction so the angle in 270 degrees if it is given clockwise direction the angle should be 90 degrees since the given planes are consecutive planes in planes of projection.