Magnetic Particle Inspection Level 1 Practice Exam

What is the optimal spacing recommended when using prods for magnetic particle inspection?

1. 4 to 6 inches (10 to 15 cm)

2. 6 to 8 inches (15 to 20 cm)

3. 8 to 10 inches (20 to 25 cm)

4. 10 to 12 inches (25 to 30 cm)

The correct answer is: 6 to 8 inches (15 to 20 cm)

The recommended spacing of 6 to 8 inches (15 to 20 cm) when using prods for magnetic particle inspection ensures effective magnetization of the test material while providing a thorough examination. This range strikes a balance between ensuring that the magnetic field is strong enough to detect surface and near-surface discontinuities and avoiding excessive power loss. If the spacing is too close, it may lead to overlapping magnetic field influences, which could make it harder to differentiate between indications. Conversely, if the spacing is too far apart, the effectiveness of the magnetization may decrease, leading to missed defects. Thus, 6 to 8 inches provides an optimal configuration that maximizes detection capabilities while maintaining the integrity of the inspection process.