Non-Destructive Testing (NDT) Practice Test

What is a commonly used aid in visual inspection for surface defects in aluminum?

1. A 5X magnifying glass

2. A 10X magnifying glass

3. A digital microscope

4. A handheld mirror

The correct answer is: A 10X magnifying glass

Using a 10X magnifying glass is effective for visual inspection of surface defects in aluminum because it provides a sufficient level of magnification to closely examine the surface while still being manageable in terms of size and portability. This level of magnification allows inspectors to detect fine details, such as scratches, dings, or any surface irregularities that may not be visible to the naked eye. The increased magnification enhances the inspector’s awareness of potential defects, which is crucial in ensuring the integrity and safety of aluminum components. In contrast, while a 5X magnifying glass may help in some inspections, it might not provide the level of detail necessary for more minute defects. A digital microscope, although beneficial for displaying images on a screen or documenting findings, can be less practical for field inspections due to the need for power and potentially more complicated setups. A handheld mirror, while useful for viewing surfaces that are difficult to access, does not provide the necessary magnification for detailed surface inspection, especially when assessing fine defects in the material.