Question

What is the name of the thin continuous line which encloses the dimension lines are generally drawn 1mm away from the outlines?

(a) Dimension line

(b) Section line

(c) Leader line

(d) Extension line

I had been asked this question by my college professor while I was bunking the class.

The doubt is from Terminology of Dimensioning in chapter Lines, Lettering and Dimensioning of Engineering Drawing

Answer 1

Right choice is (d) Extension line

The best explanation: Extension line is a thin continuous line which encloses the dimension line and they are generally drawn 1mm away from the outlines. They need to draw near to the outlines and far away from the outlines.