Question

The true length of the line is 30 cm and isometric view is drawn. How much length is reduced?

(a) 24.45 cm

(b) 25.98 cm

(c) 4.01 cm

(d) 5.55 cm

This question was addressed to me during an online interview.

Enquiry is from Isometric Axes, Lines and Planes topic in division Isometric Projection of Engineering Drawing

Answer 1

Correct answer is (d) 5.55 cm

For explanation: The ratio of isometric length to true length is 0.815 so here it is given true length of 30 cm. 0.815 = isometric length / 30 cm => isometric length = 30 cm x 0.815 = 24.45 cm. 30 cm – 24.45 cm =5.55 cm.