Question

A plane is perpendicular to vertical plane and vertical trace of a plane is making 55 degrees with the xy plane. Which of the following is false?

(a) The plane is inclined 55 degrees with the horizontal plane

(b) Front view gives a line

(c) Top view gives true shape of plane

(d) Horizontal trace is perpendicular to xy plane

I have been asked this question in unit test.

This intriguing question comes from Projection of Planes Inclined to one of the Reference Plane & Perpendicular to other topic in portion Projection of Planes of Engineering Drawing

Answer 1

Right option is (c) Top view gives true shape of plane

Explanation: When a plane is perpendicular to one of the reference planes and inclined to the other, its inclination is shown by an angle which its projection on the plane to which it is perpendicular, makes with xy. And converse for traces.