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By which curve, the small increments of angles are achieved in averaging type optical rotary machines?

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By which curve, the small increments of angles are achieved in averaging type optical rotary machines?

(a) Tan curve

(b) Cos curve

(c) Sine curve

(d) Cot curve

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Origin of the question is Rotary Tables topic in portion Angular Measurement and Circular Division of Engineering Metrology

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The correct option is (c) Sine curve

Easy explanation: Smaller increments of angle are achieved by the sine curve which is generated by electronic or optical pulsing in the averaging type optical rotary table. The circular scale could be read by electrical or by Moire fringe method.

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