Non-Destructive Testing (NDT) Practice Test

Once the surface of a part has been cleaned properly, how can penetrant be applied?

1. Manually

2. Spray method

3. All of the above

4. Using a brush

The correct answer is: All of the above

The application of penetrant on a cleaned surface can be executed in multiple ways, enabling flexibility based on the specific needs of the inspection process. Each method offers unique advantages depending on the part's geometry, the size of the area to be inspected, and the nature of the penetrant itself. Applying penetrant manually allows for precision, particularly in areas where control is essential, such as intricate geometries or tight spaces. The spray method is beneficial for covering larger surfaces quickly and evenly, ensuring that the penetrant penetrates any discontinuities effectively. Using a brush offers another alternative, granting control over the amount of penetrant applied and allowing for thorough coverage in specific areas. By recognizing that multiple methods of penetrant application can be employed, it becomes clear why "all of the above" is the correct choice. Each technique serves a purpose and can be selected based on the situation at hand, showcasing the versatility required in non-destructive testing practices.