Which item is NOT a VT viewing/lighting technique?

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Multiple Choice

Which item is NOT a VT viewing/lighting technique?

Explanation:
Visual testing relies on viewing and lighting techniques to reveal surface flaws. Direct lighting, oblique lighting, and diffuse lighting are all ways to illuminate a surface to show irregularities through shadows, reflections, or texture differences. Ultrasound testing, however, uses high-frequency sound waves and a transducer to probe beneath the surface and detect subsurface features—it's not a lighting/viewing technique. So the item that is not a VT viewing/lighting technique is ultrasound testing.

Visual testing relies on viewing and lighting techniques to reveal surface flaws. Direct lighting, oblique lighting, and diffuse lighting are all ways to illuminate a surface to show irregularities through shadows, reflections, or texture differences. Ultrasound testing, however, uses high-frequency sound waves and a transducer to probe beneath the surface and detect subsurface features—it's not a lighting/viewing technique. So the item that is not a VT viewing/lighting technique is ultrasound testing.

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