Question

Which of the following scales is neither an enlarging nor a reducing scale?

(a) 3:2

(b) 1:4

(c) 1:0.5

(d) 1:1

The question was posed to me by my school principal while I was bunking the class.

My doubt stems from Types of Scales in portion Scales of Engineering Drawing

Answer 1

Right answer is (d) 1:1

The best I can explain: A scale which is neither enlarging nor reducing is called as full size scale. The representative fraction of a full size scale is 1:1. In full size scale, the drawing is made just as the actual dimensions of the object.