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Which of the following defect occurs because of the bending of rolls?

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Which of the following defect occurs because of the bending of rolls?

(a) Zipper cracks

(b) Folds

(c) Laminations

(d) Alligatoring
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The correct answer is (a) Zipper cracks

For explanation: Wavy edges and zipper cracks can occur as defects in the material, if the rolls are bended, but not, folds or laminations or alligatoring. Their causes of occurrence are different.
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