Question

Which of the following is reducing scale?

(a) 10:1

(b) 10:2

(c) 0.5:1

(d) 2:1

I have been asked this question in a job interview.

My question is taken from Sheet layout, Types of Machine Drawing and Free-Hand Sketching topic in portion Drawing Instruments, Sheet Layout & Free-Hand Sketching of Engineering Drawing

Answer 1

The correct option is (c) 0.5:1

To explain I would say: 0.5:1 is reducing scale which we can also be written as 1:2. In the remaining options, the antecedent is more than the consequent. So we can say if the antecedent is a decimal and consequent is the whole number then the ratio is said to be reducing scale.