Ultrasonic data presented in a form representative of the cross-section of the test specimen is called what?

The correct answer is the B-scan presentation, which effectively represents the cross-sectional view of a test specimen in ultrasonic testing. In a B-scan, the amplitude of received ultrasound signals is plotted along a secondary axis, typically against depth, while the other axis represents the position of the transducer. This creates a two-dimensional image that captures the internal features and structure of the tested material, making it easier to identify flaws and discontinuities within that cross-section.

A-scan presentations offer a one-dimensional view, displaying the amplitude of echo signals as a function of time, which is useful for measuring thickness or detecting presence of discontinuities but does not visualize a cross-section. C-scan presentations, on the other hand, provide a top view in a plan-like manner, where different colors or shades indicate material properties or thickness variations over a surface, but do not demonstrate depth information. D-scan is not a standard term used in ultrasonic testing.