Question

In engineering drawing, which type of line indicates that there is a change of plane?

(a) Continuous thin wavy

(b) Long chain thin

(c) Continuous thick

(d) Medium thick short dashes

This question was addressed to me in an online interview.

This key question is from Different Types of Lines in division Lines, Lettering and Dimensioning of Engineering Drawing

Answer 1

Correct option is (c) Continuous thick

To explain I would say: In engineering drawing, a change of plane is indicated by drawing continuous thick lines. Continuous thin lines are used for indicating dimension line, hatching line, revolved section, etc. Long chain lines are used to indicate center line, cutting lines.