ASNT PT LEVEL I+II Questions and Answers with complete solution

Contain a colored (usually red) dye - Answer-Visible dye Penetrant Contain a combination of visible and fluorescent dyes - Answer-Dual Sensitivity Penetrants Which process contains penetrants that are either self-emulsifying or removable with plain water? - Answer-Water-washable Process that requires a separate emulsifier to make the penetrant water washable - Answer-PostEmulsified Penetrants Method where penetrants must be removed with a solvent which is typical when using visible dye in pressurized spray cans. - Answer-Solvent-removable penetrants Penetrant testing is limited by its inability to test materials that have what types of discontinuities? - Answer-Continuities that: -Are not open to the surface -Have an extremely porous surface This cleaning method is particularly effective in the removal of oil, grease, and similar organic contamination. - Answer-Vapor degreasing This cleaning method is particularly adaptable to the cleaning of large, unwieldy articles. - AnswerSteam Cleaning This cleaning method is effective for use on articles that have been ground or machined. This process uses an acid or an alkaline solution to open up grinding burrs and remove metal from surface discontinuities. - Answer-Etching Contain an emulsifying agent which makes them easily removable by a water rinse or wash. This penetrant material can be obtained with either a visible or fluorescent dye. - Answer-Waterwashable penetrantsHighly penetrating, oily visible or fluorescent penetrants which are not soluble in water. - AnswerPost-emulsifiable penetrants Oily penetrants that do not contain an emulsifying agent - Answer-Solvent-removable penetrants When applied to a penetrant-coated specimen, make the resultant mixture removable by water rinse or wash. (they have low penetrant characteristics) - Answer-Emulsifiers A fluffy, absorbent white powder, that is used in both fluorescent and visible dye penetrant tests. - Answer-Dry developers type of developer where the developer powder is mixed with a rapid-drying liquid solvent - AnswerNon-aqueous wet developer Must be used when articles inspected are subjected to contact with either liquid or gaseous oxygen. - Answer-Liquid oxygen (LOX) compatible materials Liquid penetrant place on the surface of a specimen does not merely seep into discontinuities, it is pulled into them by what? - Answer-Capillary action What are some methods of penetrant application? - Answer-Spraying Brushing Immersion Pouring The period of time during which the penetrant is permitted to remain on the specimen - AnswerDwell Time Which penetrant is preferred for use on articles with a rough surface or one that contains threads or keyways? - Answer-Water-washable penetrant What is the main disadvantage of water-washable penetrants? - Answer-Poor reliability in detecting wide or shallow discontinuitiesWhich penetrant method is difficult to use on rough surfaces, such as cast magnesium? - AnswerSolvent removable penetrant This penetrant has a very high sensitivity for very fine discontinuities, but is difficult to remove from threads, keyways, blind holes, and rough surfaces - Answer-Post-emulsification The use of liquid penetrant in this method is suited for finding leaks in such articles as tanks, piping, tubing, and hollow castings. - Answer-Leak-through technique The temperature of the oven should not exceed ______ Degrees F, as this could evaporate penetrant in the discontinuity - Answer-225 Degrees Fahrenheit What is the most common source of false indications? - Answer-Poor washing What are the five basic categories of 'True Indications'? - Answer-1. Continuous Line 2. Intermittent Line 3. Round 4. Small dots 5. Diffused or weak This type of indication is often caused by cracks, cold shuts, forging laps, scratches, or die marks - Answer-Continuous Line