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Which of the following scale is a plain scale with fully divided minor divisions?

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Which of the following scale is a plain scale with fully divided minor divisions?

(a) Diagonal scale

(b) Vernier scale

(c) Primary scale

(d) Comparative scale

I have been asked this question by my school teacher while I was bunking the class.

Question is taken from Types of Scales topic in chapter Scales of Engineering Drawing

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The correct answer is (c) Primary scale

Easy explanation: The primary scale is a plain scale with fully divided minor divisions. For reading very small dimensions, minor divisions cannot be further divided. Hence we use a Vernier scale to read those dimensions.

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