In immersion testing in a small tank, a manually operated manipulator is used to set which parameters?

• A. Transducer angle
• B. Water path
• C. Index function
• D. Water temperature

Answer: (A)

In immersion testing, the beam direction inside the material is controlled primarily by the angle at which the transducer is set against the test surface. The manually operated manipulator holds and tilts the transducer, so it’s used to adjust that incidence angle. Changing the angle changes how the ultrasonic wave refracts into the material and which defect orientations you can detect, which is essential for locating flaws at different orientations and depths.

Water path and water temperature are important factors, but they’re controlled by the water setup and bath, not by the manual tilting of the transducer. The term index function isn’t a standard parameter you adjust with the manipulator in this context. Thus, the parameter best set by the manually operated manipulator is the transducer angle.