Question:
Which of the following techniques can be used to detect an internal defect in a metal casting?
Which of the following techniques can be used to detect an internal defect in a metal casting?
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For internal defects: use ultrasonic or radiographic methods. For surface defects: use dye penetrant or magnetic particle inspection.
Updated On: Aug 23, 2025
- Ultrasonic inspection
- Liquid (or dye) penetrant inspection
- Gamma-ray radiography
- X-ray radiography
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The Correct Option is A, C, D
Solution and Explanation
Step 1: Classification of testing methods.
- Ultrasonic inspection uses high-frequency sound waves to detect internal flaws like voids, cracks, inclusions.
- Liquid penetrant inspection is only for surface defects. It cannot detect internal defects.
- Gamma-ray and X-ray radiography can penetrate the material and reveal internal shrinkage cavities, porosity, inclusions. Step 2: Check each option.
(A) Ultrasonic inspection – correct for internal defects.
(B) Dye penetrant – surface only, not correct.
(C) Gamma-ray radiography – correct for internal defects.
(D) X-ray radiography – correct for internal defects. Step 3: Conclusion.
The correct techniques are (A), (C), and (D). \[ \boxed{\text{Correct: (A), (C), and (D)}} \]
- Ultrasonic inspection uses high-frequency sound waves to detect internal flaws like voids, cracks, inclusions.
- Liquid penetrant inspection is only for surface defects. It cannot detect internal defects.
- Gamma-ray and X-ray radiography can penetrate the material and reveal internal shrinkage cavities, porosity, inclusions. Step 2: Check each option.
(A) Ultrasonic inspection – correct for internal defects.
(B) Dye penetrant – surface only, not correct.
(C) Gamma-ray radiography – correct for internal defects.
(D) X-ray radiography – correct for internal defects. Step 3: Conclusion.
The correct techniques are (A), (C), and (D). \[ \boxed{\text{Correct: (A), (C), and (D)}} \]
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