Question

A line which is parallel to horizontal plane and making an angle of 75 degrees with vertical has a length of 5 cm from top view. What is its true length?

(a) 4.82 cm

(b) 1.29 cm

(c) 19.31 cm

(d) 5 cm

This question was posed to me during an interview.

Enquiry is 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

Right choice is (d) 5 cm

To explain I would say: True length of line parallel to vertical plane and making angle with horizontal can be of two values either from top view or side view but from front view the length will be given length. As here it is given top view the length given is true length.