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Small drilled hole was a reference calibration in eddy current testing because it was produced in precise sizes.

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Small drilled hole was a reference calibration in eddy current testing because it was produced in precise sizes.

(a) True

(b) False

I have been asked this question in unit test.

This key question is from Eddy Current Test topic in portion Non Destructive Techniques of Casting-Forming-Welding II

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Right option is (a) True

For explanation: For making perfect measurements and calculations, a few artificial defects were tried and a small hole was selected as the standard. The small drilled hole was selected because, it was not just easy to produce, but also, it was produced in precise sizes.

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