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The representative factor is 4. The actual length is 20 mm. Find the length of the drawing.

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The representative factor is 4. The actual length is 20 mm. Find the length of the drawing.

(a) 5 cm

(b) 5 mm

(c) 0.2 mm

(d) 8 cm

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Enquiry is from Representative Factor topic in section Scales of Engineering Drawing

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Correct answer is (d) 8 cm

Explanation: The representative factor given is 4 (more than one), shows the scale is enlarging. Representative factor = ratio of the length in drawing to actual length. R.F. = (length in drawing)/20 mm = 4.

Length in drawing = 20 mm x 4 = 80 mm = 8 cm.

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