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What is the length of the scale, if the scale is 1:30?

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What is the length of the scale, if the scale is 1:30?

(a) 0.6 yard

(b) 7.2 feet

(c) 0.2 feet

(d) 7.2 inches

The question was posed to me in final exam.

This interesting question is from Diagonal Scales in section Scales of Engineering Drawing

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Right answer is (d) 7.2 inches

Explanation: The length of the scale is measured as; length of the scale = representative fraction x maximum length to be measured. Hence, length of the scale  = 1 ÷ 30 x 6 x 3 x 12 = 7.2 inches. Representative fraction for the scale 1:30 is 1/30.

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