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

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Capillary action is the physical mechanism that drives a liquid penetrant into a surface-breaking discontinuity. Which combination of properties primarily controls how strongly capillary action pulls a penetrant into a tight crack?

Surface tension of the penetrant and contact angle with the part surface Density of the penetrant and ambient temperature only Vapor pressure of the penetrant and atmospheric humidity Color of the dye and viscosity of the developer

Correct Answer:

Surface tension of the penetrant and contact angle with the part surface

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