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Where will be the vernier scale is present?

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Where will be the vernier scale is present?

(a) Base plate

(b) Circular plate

(c) Adjustable plate

(d) Main body

This question was addressed to me by my college director while I was bunking the class.

This intriguing question comes from Vernier and Optical Bevel Protractor topic in division Angular Measurement and Circular Division of Engineering Metrology

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Right answer is (b) Circular plate

For explanation I would say: It has a base plate which is attached to the main body. Circular plate contains vernier scale. It contains 24 divisions coinciding with 23 main scale divisions. One full rotation of adjustable blade increase one division in main scale.

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