Question

Oblique planes come under  ________________

(a) planes perpendicular to both reference planes

(b) planes perpendicular to one reference plane and inclined to other reference plane

(c) planes inclined to both the reference planes

(d) planes parallel to one reference plane and perpendicular to other reference plane

I got this question in an interview.

This is a very interesting question from Basics of Planes topic in portion Projection of Planes of Engineering Drawing

Answer 1

Right choice is (c) planes inclined to both the reference planes

To explain: Planes may be divided into two main types. i. Perpendicular planes and ii. Oblique planes, planes which are held inclined to both the reference planes are called oblique planes, the rest come under perpendicular planes.