Non-Destructive Testing (NDT) Practice Test

Which type of inspection must always be conducted to confirm no visible defects before further testing?

1. Visual Inspection

2. Radiographic Inspection

3. Magnetic Particle Inspection

4. Ultrasonic Testing

The correct answer is: Visual Inspection

Visual inspection is a critical step in the non-destructive testing (NDT) process as it serves as the preliminary assessment of the material or component being examined. This type of inspection allows technicians to detect any visible surface defects such as cracks, corrosion, or other irregularities before proceeding to more complex and resource-intensive testing methods like radiographic, magnetic particle, or ultrasonic inspections. Conducting a visual inspection ensures that any obvious defects are identified early in the process, which could affect the validity or safety of the subsequent tests. If significant defects are visible, it may be unnecessary or unwise to conduct further testing. By confirming the absence of visible defects first, the integrity of the testing process is maintained, allowing for a more accurate and focused evaluation of the material. In summary, visual inspection is essential as it plays a foundational role in the overall NDT sequence, ensuring that only suitable subjects are further evaluated with additional testing methods.