ASNT NDT Level III PT Practice Questions - ASNT NDT Level III Liquid Penetrant Testing (PT) Exam

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A penetrant has a contact angle of approximately 5 degrees on a clean steel surface. What does this low contact angle indicate about the penetrant's ability to enter surface-breaking discontinuities?

Poor wettability and weak capillary action Excellent wettability and strong capillary action High viscosity that blocks small openings Low fluorescence under UV-A

Correct Answer:

Excellent wettability and strong capillary action

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