In ultrasonic testing, a liquid coupling medium between the crystal surface and the part surface is necessary because :

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Q. In ultrasonic testing, a liquid coupling medium between the crystal surface and the part surface is necessary because :

(A) Lubricant is required to minimize wear on the crystal surface
(B) An air interface between the crystal surface and the part surface would almost completely reflect the ultrasonic vibrations
(C) The crystal will not vibrate if placed directly in contact with the surface of the part being inspected
(D) The liquid is necessary to complete the electrical circuit in the search unit

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✅ Correct Answer: (B) An air interface between the crystal surface and the part surface would almost completely reflect the ultrasonic vibrations

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