Question

To represent the object on paper by orthographic projection the horizontal plane (H.P) should be placed in which way?

(a) The H.P is turned in a clockwise direction up to 90 degrees

(b) The H.P is turned in anti-clockwise direction up to 90 degrees

(c) H.P plane is placed to left side of vertical plane parallel to it

(d) H.P plane is placed to right side of vertical plane parallel to it

I have been asked this question in an interview for internship.

This question is from Basics of Orthographic Projections in chapter Loci of Points & Orthographic Projections of Engineering Drawing

Answer 1

Right choice is (a) The H.P is turned in a clockwise direction up to 90 degrees

The explanation: The vertical plane and horizontal plane are perpendicular planes intersected at reference line. So on paper to represent perpendicular planes any of the planes should arrange to get a real picture of required projection.