Prepare for the Non-Destructive Testing (NDT) Exam with our comprehensive practice tests. Utilize multiple choice questions, detailed explanations, and expert guidance. Achieve success and advance your career in NDT!

Practice this question and more.


What does an increase in frequency typically result in during ultrasonic testing?

  1. Decreased sensitivity to small flaws

  2. Increased wavelength of sound waves

  3. Enhanced resolution but reduced penetration

  4. Greater attenuation in the material

The correct answer is: Enhanced resolution but reduced penetration

An increase in frequency during ultrasonic testing enhances resolution while reducing penetration. This phenomenon occurs because higher frequencies produce shorter wavelengths. Shorter wavelengths are capable of resolving finer details and distinguishing smaller imperfections in the material being tested. This increased resolution allows for better detection of small flaws that might otherwise go unnoticed when using lower frequencies. However, the trade-off is that while high frequency enhances the ability to identify small flaws, it also results in reduced penetration depth. The sound waves cannot travel as deeply into the material, which can be a limiting factor when assessing the integrity of thicker or denser materials. Therefore, when selecting frequency for ultrasonic testing, technicians must balance the need for resolution against penetration requirements based on the specific testing application and the material characteristics.