Question

What is the length of the scale, representative fraction given is 3/40 and maximum length to be represented in scale is 100 cm?

(a) 8.5 cm

(b) 10 cm

(c) 7.5 cm

(d) 13.33

The question was asked during an online exam.

This is a very interesting question from Plane Scales in portion Scales of Engineering Drawing

Answer 1

Right answer is (c) 7.5 cm

Best explanation: Length of the scale = Representative fraction x Maximum length. Length of the scale = 3/40 x 100 cm = 7.5 cm. That is to draw a scale for 100 cm with 3/40 R.F. We need to draw a 7.5 cm length line and divide to 10 decimeters.