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Which of the following methods of inspection uses high frequency of sound waves for the detection of flaws in the castings?

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Which of the following methods of inspection uses high frequency of sound waves for the detection of flaws in the castings?

(a) Penetrant test

(b) Radiography

(c) Pressure test

(d) Ultrasonic inspection

The question was posed to me in a national level competition.

Question is from Non Destructive Testing in chapter Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct answer is (d) Ultrasonic inspection

Explanation: Ultrasonic inspection is used to detect defects like cracks and porosity within the interior of the casting or material. This method uses reflection and transmission of high frequency sound waves, which are much higher than the audible range and then these waves are made pass through the casting for inspection.

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