Question

What is the length of AB in the following scale?

(a) 2.74 m

(b) 3.74 m

(c) 2.47 m

(d) 3.47 m

I had been asked this question in an online quiz.

My question comes from Diagonal Scales in portion Scales of Engineering Drawing

Answer 1

Correct answer is (a) 2.74 m

To explain I would say: Reading of the diagonal involves reading in three ways. The first measurement is taken in the meters scale, the second is from the decimeters scale and the third is from the centimeters scale. Hence in meters scale, the value is 2 m from 0; in decimeters scale, the value is 7 dm and in the centimeters scale, the value is 4 cm. Hence length of AB = 2.74 m.