Question

The front views of 1^st, 2^nd and final stages of regular cone, has its axis inclined at 30 degrees with H.P and 45 degrees with V.P while drawing orthographic projections are __________

(a) Circle, triangle, triangle

(b) Circle, triangle with base as ellipse, triangle with base as ellipse

(c) Triangle, triangle, triangle with base as ellipse

(d) Triangle, triangle, triangle

I had been asked this question in an international level competition.

Enquiry is from Projection of Solids with Axes Inclined to both Horizontal and Vertical Plane topic in section Projection of Solids of Engineering Drawing

Answer 1

The correct answer is (c) Triangle, triangle, triangle with base as ellipse

The explanation: As the 1^st stage is to keep the solid in simple position and given is front view it is triangle and then rotated to an angle of 30 degrees with H.P which again gives triangle and then rotating 45 degrees with V.P which gives triangle with base as ellipse.