Question

A plane perpendicular to vertical plane and inclined to horizontal plane then the vertical trace of that plane will be _____________

(a) parallel to horizontal plane

(b) perpendicular to horizontal plane

(c) parallel to xy reference line

(d) inclined to horizontal plane

I had been asked this question in an online interview.

My doubt stems from Basics of Planes in section Projection of Planes of Engineering Drawing

Answer 1

Right answer is (d) inclined to horizontal plane

Easiest explanation: When a plane is perpendicular to one of the reference planes and inclined to the other, its inclination is shown by the angle which its projection on the plane to which it is perpendicular, makes with xy. Its projection on the plane to which it is inclined, is smaller than the plane itself.