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Which of the following methods of NDT requires leak proofing of casting before inspection?

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Which of the following methods of NDT requires leak proofing of casting before inspection?

(a) Impact test

(b) Visual inspection

(c) Sound test

(d) Pressure test

This question was addressed to me in an online quiz.

This question is from Non Destructive Testing in portion Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct answer is (d) Pressure test

For explanation I would say: Pressure test used on castings required to be leak proof. In this method, all the openings of the casting are closed and then gas with high pressure is introduced in it. If the casting is having a porosity or another defect, then it can be detected by leaking of gas in the water when the casting is submerged into the water.

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