Question

A plain scale is made which shows 6 meters of maximum length and sub division is decimeter with a R.F. of 1 /60. How much length does the scale shows 4 m and 5 decimeters?

(a) 4 m 5 dm

(b) 4.5 m

(c) 0.75 dm

(d) 0.75 m

I have been asked this question in an online quiz.

Enquiry is from Plane Scales in division Scales of Engineering Drawing

Answer 1

The correct choice is (b) 4.5 m

Best explanation: length of the scale = Representative fraction x Maximum length, length of scale =1/60 x 4.5 m = 0.075 m = 0.75 dm = 7.5 cm = 75 mm. (or) 1/60 x 4 m =0.0666 m + 1/60 x 5 dm = 0.083 dm, 0.666 dm + 0.08333 dm =0.7499 dm =7.5 cm = 75 mm.