Question

A line which is parallel to profile plane and making an angle of 40 degrees with horizontal has a length of 4 cm from top view. What is its true length?

(a) 3.06 cm

(b) 5.22 cm

(c) 6.22 cm

(d) 2.57 cm

I had been asked this question in an interview for job.

I'd like to ask this question from True Length of a Straight Line and its Inclinations with the Reference Planes topic in portion Projection of Lines of Engineering Drawing

Answer 1

The correct choice is (b) 5.22 cm

Explanation: True length of line parallel to profile plane and making angle with horizontal plane can be of two values either from top view or front view but from side view the length will be given length. As here it is given top view L= 4/cos (40).