Magnetic Particle Inspection Level 2 Practice Exam

What factor can affect the reliability of indications during inspection with coil magnetization?

1. The diameter of the coil

2. The material properties of the part

3. The distance from the coil to the part

4. All of the above

The correct answer is: All of the above

In the context of magnetic particle inspection, the reliability of indications can indeed be influenced by multiple factors, including the diameter of the coil, the material properties of the part, and the distance from the coil to the part. The diameter of the coil is critical because it impacts the distribution and intensity of the magnetic field generated. A larger coil may produce a more uniform magnetic field, while a smaller coil can concentrate the field more narrowly, affecting the sensitivity and the likelihood of detecting indications. The material properties of the part also play a significant role. Different materials can have varying magnetic permeability, conductivity, and mechanical properties, all of which influence how the magnetic field interacts with the part. Additionally, the surface condition and any treatments (like coatings or finishes) can change how magnetic particles respond, thereby affecting the visibility of any indications. Distance from the coil to the part can affect the intensity and uniformity of the magnetic field experienced by the part itself. As the distance increases, the strength of the magnetic field diminishes, which may lead to weaker indications or the inability to detect subsurface defects effectively. Therefore, acknowledging that all these factors collectively influence the reliability of indications during coil magnetization encapsulates the complexity of ensuring accurate and effective magnetic particle inspections.