Question

Auxiliary planes are of _______ types.

(a) two

(b) one

(c) three

(d) six

The question was asked in examination.

The doubt is from Projections on Auxiliary Planes in section Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing

Answer 1

Correct answer is (a) two

The explanation is: These are A.V.P (Auxiliary vertical plane) and A.I.P. (Auxiliary inclined plane). Auxiliary vertical plane is perpendicular to the H.P. and inclined to the V.P. projection on an A.V.P. is called auxiliary front plane. Auxiliary inclined plane is perpendicular to the V.P. and inclined to the H.P. projection on an A.I.P. is called auxiliary top view.