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The specimen of fatigue testing must not have ___________

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The specimen of fatigue testing must not have ___________

(a) Uniform cross-section

(b) Metal

(c) Certain colours

(d) Notches and holes

I got this question in an international level competition.

My question is from Aircraft Materials topic in chapter Testing Aircraft Materials of Aerospace Materials & Processes

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Correct choice is (d) Notches and holes

The best I can explain: It is necessary that the specimen being tested to determine fatigue strength not have notches and holes in it. The specimen is usually cylindrical rods that do not contain any of the above defects.

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