Question

An equilateral triangle is positioned in the first quadrant and is inclined at an angle of 30 degrees with the H.P and 30 degrees with the V.P. The front views while drawing projections in 1, 2 and 3 stages are _______ _________ and __________ respectively.

(a) line, equilateral triangle, line

(b) line, line, scalene triangle

(c) equilateral triangle, isosceles triangle, isosceles triangle

(d) equilateral triangle, isosceles triangle, scalene triangle

This question was addressed to me in an interview for job.

This intriguing question originated from Projection of Oblique Plane topic in section Projection of Planes of Engineering Drawing

Answer 1

Correct answer is (b) line, line, scalene triangle

To explain I would say: As initially the plane is assumed to be parallel to H.P the front view will be line and then the plane is tilted with respect to H.P to required angle the front view (line makes angle with H.P) remains line. Finally the plane is tilted with respect to V.P then scalene triangle will form in front view.