Which of the following is NOT an acceptable technique for Non-Destructive Testing (NDT)?

Non-Destructive Testing (NDT) includes various techniques used to evaluate the properties of materials, components, or assemblies without causing damage. The purpose of NDT is to detect and document any defects or discontinuities in materials while maintaining their integrity for further use.

Ultrasonic testing involves using high-frequency sound waves to detect imperfections within a substance, making it a standard technique in NDT. Radiographic testing uses X-rays or gamma rays to create images of internal structures, allowing for the identification of flaws without compromising the material. Infrared testing detects thermal patterns and anomalies, which can indicate issues like insulation breakdown or overheating in electrical systems, further confirming its status as an NDT technique.

In contrast, destructive testing entails methods that cause some form of damage or alteration to the material being tested, such as breaking a sample to assess its tensile strength. This makes destructive testing unsuitable for NDT, as the goal of NDT is to inspect without impairment. Therefore, the identification of destructive testing as not an acceptable NDT technique is correct based on its fundamental principle of causing damage to the test specimen.