Magnetic Particle Inspection Level 2 Practice Exam

What effect do internal splines and holes drilled parallel to or near test surfaces have?

1. Broad, fuzzy indications aligned with the part's internal contours

2. Sharp, well-defined indications aligned with the part's internal contours

3. No indications

4. Both a and b

The correct answer is: Broad, fuzzy indications aligned with the part's internal contours

The presence of internal splines and holes that are either drilled parallel to or near the test surfaces can result in broad, fuzzy indications. These features create changes in the magnetic field distribution during the magnetic particle inspection process. When the magnetic field is disrupted by these contours, it causes the magnetic particles to gather in a manner that is not sharply defined. Instead, they may appear spread out or diffuse, leading to broad and fuzzy indications. Well-defined indications tend to occur when the magnetic field is uniform and the discontinuities such as cracks or other surface flaws are present. However, in the case of internal features like splines or holes, the complexities of the geometry can lead to variations in the indication quality, resulting in more diffuse representations of the magnetic field disturbances. This characteristic aligns closely with how the magnetic particle inspection process interacts with irregularities in the test piece.