Under SNT-TC-1A, what is the employer's document that spells out its training, experience and examination requirements for each NDT level called?
- Technique sheet
- Quality manual
- Procedure qualification record
- Written practice
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D. Written practice
The written practice is the employer's own document describing how its NDT personnel are trained, examined and certified. A technique sheet describes how to test a specific part, and a procedure qualification record belongs to welding qualification, not personnel certification.
Reference: ASNT SNT-TC-1A, written practice
Passing current end to end through a solid bar clamped between the heads of a wet horizontal unit (a head shot) produces which kind of field?
- Longitudinal
- Radial
- Multidirectional
- Circular
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D. Circular
Current flowing along a conductor sets up a magnetic field in circles around the current path, so a head shot magnetises the bar circularly. A longitudinal field needs a coil or a yoke.
Reference: ASTM E709, circular magnetisation; right-hand rule
In the standard penetrant classification, which removal method is designated Method C?
- Water washable
- Post-emulsifiable, lipophilic
- Solvent removable
- Post-emulsifiable, hydrophilic
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C. Solvent removable
The methods are A water washable, B post-emulsifiable lipophilic, C solvent removable and D post-emulsifiable hydrophilic. Method C is the portable spray-can process most often used for field weld inspection.
Reference: ASTM E1417 and SAE AMS 2644, penetrant classification