[Solved] A calibration for immersion ultrasonic testing of pipe or tubing should establish a transducer position such as:

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Q.	A calibration for immersion ultrasonic testing of pipe or tubing should establish a transducer position such as:
A.	I.D. and O.D. notches produce equal responses for equivalent metal path distances
B.	Rayleigh waves are generated through the entire pipe or tubing wall
C.	All ultrasound enters the test piece
D.	Only longitudinal waves are generated in the test piece
Answer» C. All ultrasound enters the test piece

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