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What is the advantage of using direct current in magnetic particle inspection?

What is the advantage of using direct current in magnetic particle inspection? Correct Answer Subsurface detection

Sub-surface flaws can also be detected by using direct current supply due to its higher penetration. But demagnetization of the specimen becomes difficult.

Related Questions

Consider the below statements. (i) Inspection is the process of measuring the quality of a product or service in terms of established standards. (ii) Inspection is the art of comparing materials, products or performances with established standards. (iii) Inspection is the art of applying tests, preferably by the aid of measuring appliances to observe whether a given item of product is with n the specified limits of variability. (iv) Inspection is not a tool for controlling the quality of the product. Which of the above statements are correct?
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Successful inspection during 100% inspection phase may make the customer switch to sampling inspection during the next round of delivery from the supplier.
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Which of the following statements are correct?
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2. Flow of current in a conductor produces magnetic field.
3. Magnetic field related to coil can be produced by motion between conductor and coil.
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