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Which of the following principle is used to derive authority for angles of angle gauges or angular relationships in mechanical parts and assemblies?

(a) Self-assessment principle of dividing the circle

(b) Self proving principle of dividing the circle

(c) Self verification principle of dividing the circle

(d) Self explaining principle of dividing the circle

I had been asked this question at a job interview.

My question is taken from Universal Measuring Machine topic in chapter Measuring Machines & Total Quality Management of Engineering Metrology

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Right choice is (b) Self proving principle of dividing the circle

The explanation is: Accurate circle division is a requirement of all machine shops and laboratories. The self-proving principle of dividing the circle is used to derive the authority for “angles” of angle gauges, rotary tables, or the angular relationships in mechanical parts and assemblies.

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