Question

The top 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

The question was posed to me at a job interview.

This question 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 choice is (b) Circle, triangle with base as ellipse, triangle with base as ellipse

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