Magnetic Particle Inspection Level 2 Practice Exam

What is a limitation of coil magnetization techniques?

1. The coil must be of minimum diameter in relation to the part

2. The effective field is limited on either side of the coil

3. Small diameter parts should be placed close to the coil

4. All of the above

The correct answer is: All of the above

Coil magnetization techniques have several limitations that affect their effectiveness in various situations. One significant limitation is that the coil’s design must adhere to specific dimensions relative to the part being inspected. This means that the diameter of the coil must be at least a certain minimum size compared to the part to ensure proper magnetization. If the coil is too small, it may not generate a sufficient magnetic field to detect surface or near-surface flaws effectively. Additionally, the effective magnetic field produced by the coil is confined on either side, creating areas where the field strength may not be adequate for detecting defects. This limitation can result in regions of the part not receiving the necessary magnetization, potentially leading to missed indications of flaws that lie outside the effective range of the magnetic field. Lastly, when inspecting small diameter parts, it is beneficial to place them close to the coil. This positioning is necessary to achieve adequate magnetization due to the limitations of the coil's effective field. If small parts are positioned too far from the coil, the magnetic field strength diminishes, which could compromise the detection of defects. Overall, these limitations collectively highlight the challenges associated with using coil magnetization techniques in Magnetic Particle Inspection, making the option that acknowledges all of these factors the most comprehensive and