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Which type of irregularities comes under the first group?

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Which type of irregularities comes under the first group?

(a) First and second order

(b) Second and third order

(c) Third and fourth order

(d) First and fourth order

This question was posed to me in an internship interview.

This interesting question is from Meaning of Surface Texture topic in division Measurement of Surface Finish of Engineering Metrology

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Right answer is (a) First and second order

The explanation is: First group includes irregularities of considerable wave-length. These errors include irregularities of first and second order. These are mainly due to misalignment of centres. These errors are also referred to as Waviness.

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