Question

The axis of the cylinder or sphere is denoted by which of the following line?

(a) Section line

(b) Centre line

(c) Hidden line

(d) Leader line

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

The above asked question is from Different Types of Lines in chapter Lines, Lettering and Dimensioning of Engineering Drawing

Answer 1

Correct answer is (b) Centre line

To explain: Centre line shows the axis of the cylinder or sphere. These lines generally pass through the centre of the circle. For a cylinder, they generally are parallel to the height of the cylinder. For circles, two centre lines are drawn perpendicular to each other passing through the centre of the circle.