Question

What is the representative factor if sides of a square measuring 4cm in the drawing sheet while the actual length of the side of the square is 3m?

(a) 1:0.75

(b) 4:3

(c) 1:75

(d) 3:4

This question was posed to me in homework.

This key question is from Representative Factor in portion Scales of Engineering Drawing

Answer 1

Correct choice is (c) 1:75

To explain I would say: The length of the drawing is 4cm and the actual length of the drawing is 3m. By using the formula for calculating the representative factor we get the value of R.F. as 1:75. R.F. = 4 ÷ 300. The units of both the quantities should be the same.