The most commonly used method of producing shear waves in a test part when inspecting by the immersion method is:

The most commonly used method of producing shear waves in a test part when inspecting by the immersion method is:

• A. By transmitting longitudinal waves into a part in a direction perpendicular to its front surface
• B. By using two crystals vibrating at different frequencies
• C. By using a Y cut quartz crystal
• D. By angulating the search tube to the proper angle

Answer: (D)