Question

The graduations of which scale is derived from the primary scale?

(a) Comparative scale

(b) Vernier scale

(c) Plain scale

(d) Diagonal scale

This question was addressed to me by my school teacher while I was bunking the class.

This intriguing question originated from Types of Scales in section Scales of Engineering Drawing

Answer 1

The correct choice is (b) Vernier scale

For explanation: The graduations on the primary scale helps in making the graduations on the Vernier scale. For reading very small dimensions we need to further divide the minor divisions on the primary scale, which will to problems in reading dimensions properly. Hence the Vernier scale is used.