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Which of the following cannot be detected using visual inspection?

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in Casting-Forming-Welding I by (687k points)
Which of the following cannot be detected using visual inspection?

(a) Blowholes

(b) Crack within the cast

(c) Tears

(d) Rattails

This question was addressed to me by my school principal while I was bunking the class.

This question is from Visual Inspection topic in portion Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct option is (b) Crack within the cast

Easiest explanation: Visual inspection can be used for detection of many kinds of defects like cracks, tears, blowholes, rattails, metal penetration, swells, shifts and many more. But for detecting cracks within the cast, visual inspection is not the way.

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