What Is Liquid Penetrate? Know About This Nde Methord

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  • 1/76 Questions

    Which of the following types of discontinuities will not be detected by the liquid penetrant test method?

    • Surface laminations
    • Internal forging burst
    • Surface cracks
    • Surface laps
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About This Quiz

Dye penetrant inspection, also called liquid penetrate inspection or penetrant testing, is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials.

What Is Liquid Penetrate? Know About This Nde Methord - Quiz

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  • 2. 

    Which of the following contaminants could affect the sensitivity of a penetrant?

    • Acid

    • Water

    • Salts

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the contaminants listed, including acid, water, and salts, can affect the sensitivity of a penetrant. Acid can react with the penetrant and cause it to degrade or become less effective. Water can dilute the penetrant, reducing its ability to detect flaws. Salts can also interfere with the penetrant's ability to adhere to the surface being inspected, leading to false readings or diminished sensitivity. Therefore, all of these contaminants have the potential to impact the sensitivity of a penetrant.

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  • 3. 

    Which of the following discontinuities would be impossible to detect using a liquid penetrant test?

    • Forging lap

    • Crater crack

    • Grinding cracks

    • Non-metallic internal inclusions

    Correct Answer
    A. Non-metallic internal inclusions
    Explanation
    Non-metallic internal inclusions would be impossible to detect using a liquid penetrant test because this testing method relies on the capillary action of a liquid to penetrate surface-breaking defects. Non-metallic internal inclusions are not surface defects and therefore cannot be detected using this method.

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  • 4. 

    Which of the following are typical of foreign matter which might block the opening of discontinuities if the surface of the test specimen is not properly cleaned?

    • Paint

    • Scale

    • Core and mold material

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Foreign matter such as paint, scale, and core and mold material can all potentially block the opening of discontinuities if the surface of the test specimen is not properly cleaned. These substances can adhere to the surface and fill in any cracks or gaps, making it difficult to detect any defects or discontinuities during testing. Therefore, it is important to ensure that the surface is thoroughly cleaned before conducting any tests to ensure accurate results.

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  • 5. 

    The prime purpose of the blacklight for fluorescent penetrant inspection is:

    • To magnify indications

    • To make the indications visible

    • To develop indications

    • To speed up inspections

    Correct Answer
    A. To make the indications visible
    Explanation
    The blacklight is used in fluorescent penetrant inspection to make the indications visible. The blacklight emits ultraviolet light, which causes the fluorescent penetrant material to glow, making any indications or defects easily visible to the inspector. This is essential in detecting surface cracks, leaks, or other imperfections that may not be visible under normal lighting conditions. By using the blacklight, inspectors can accurately identify and assess any flaws in the material being inspected.

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  • 6. 

    When improper processing causes inspection difficulties, what should the inspector do?

    • Swab parts with a solvent

    • Use a correct bleed-back procedure

    • Erase non-relevant fluorescence

    • Reprocess the part

    Correct Answer
    A. Reprocess the part
    Explanation
    When improper processing causes inspection difficulties, the inspector should reprocess the part. This means that they should repeat the processing steps in order to correct any errors or issues that may have occurred during the initial processing. By doing so, the inspector can ensure that the part is properly processed and can then be inspected without any difficulties.

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  • 7. 

    A crack type discontinuity will generlly appear as:

    • A round indication

    • A continuous line, either straight or jagged

    • A straight, single solid line

    • Random round or elongated holes

    Correct Answer
    A. A continuous line, either straight or jagged
    Explanation
    A crack type discontinuity will generally appear as a continuous line, either straight or jagged. This indicates that the material has experienced a fracture or separation along a specific path. The line can be straight if the crack propagates in a uniform direction, or jagged if it changes direction or encounters obstacles. This type of indication suggests a structural weakness or potential failure in the material.

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  • 8. 

    Which of the following is a possible cause for false penetrant indications?

    • Excessive washing

    • Inadequate application of developer

    • Penetrant or part to cold during penetration time

    • Lint or dirt

    Correct Answer
    A. Lint or dirt
    Explanation
    Lint or dirt can be a possible cause for false penetrant indications because if there is lint or dirt present on the surface being inspected, it can interfere with the penetrant's ability to properly penetrate into any surface defects. This can result in false indications, making it difficult to accurately identify actual defects. Therefore, it is important to ensure that the surface is clean and free from any lint or dirt before applying the penetrant for accurate inspection results.

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  • 9. 

    Which of the following is a advantage of fluorescent penetrants over visible type penetrants?

    • The inspection can be carried out in a well lighted area

    • Small indications are more easily seen

    • They ccan be used where cotact with water is objectionable

    • Less sensitive to contamin ation of discontinuities

    Correct Answer
    A. Small indications are more easily seen
    Explanation
    Fluorescent penetrants have the advantage of making small indications more easily visible compared to visible type penetrants. This is because fluorescent penetrants emit a bright, fluorescent glow under ultraviolet light, making even the smallest indications stand out more prominently. This allows for improved detection and identification of defects or discontinuities during inspections.

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  • 10. 

    Which of the following could be a source of false indications on a test specimen?

    • Pentrant on the test table

    • Penetrant on the hands of the inspector

    • Contamination of dry or wet developer with penetrant

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the above options could be potential sources of false indications on a test specimen. If there is penetrant on the test table, it may mix with the penetrant on the specimen and create false indications. Similarly, if the inspector has penetrant on their hands, it can transfer to the specimen and cause false indications. Additionally, if the dry or wet developer used in the testing process is contaminated with penetrant, it can also lead to false indications on the specimen.

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  • 11. 

    Which of  the following is not a form in which penetrant developer is commonly available?

    • Dry developer

    • Non Aqueous developer

    • Wet developer

    • High viscosity developer

    Correct Answer
    A. High viscosity developer
    Explanation
    High viscosity developer is not a commonly available form of penetrant developer. Penetrant developer is typically available in three common forms: dry developer, non-aqueous developer, and wet developer. Dry developer is a powder that is applied to the surface of the part being inspected. Non-aqueous developer is a liquid that contains a suspension of developer particles and is applied using a spray or brush. Wet developer is a suspension of developer particles in a water-based solution and is typically applied by immersion or spraying. High viscosity developer, on the other hand, is not commonly used and therefore not readily available.

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  • 12. 

    The function of the emulsifier in the post-emulsification penetrant method is to:

    • More rapidly drive the penetrant into deep, tight cracks

    • React with the surface penetrant to make the penetrant water-washable

    • Add fluorescent dye or pigment to the penetrant

    • Provide a coating to which dry powder developer can adhere

    Correct Answer
    A. React with the surface penetrant to make the penetrant water-washable
    Explanation
    The function of the emulsifier in the post-emulsification penetrant method is to react with the surface penetrant to make it water-washable. This means that the emulsifier helps to dissolve the penetrant and make it easier to remove from the surface being inspected. By making the penetrant water-washable, it allows for easier and more effective cleaning of the part after inspection, ensuring that any excess penetrant is removed and reducing the risk of false indications.

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  • 13. 

    Which of the following discontinuities might be found in a welded fabrication?

    • Shrinkage

    • Lack of fusion

    • Seams

    • Laps

    Correct Answer
    A. Lack of fusion
    Explanation
    In a welded fabrication, lack of fusion refers to a type of discontinuity where the weld metal fails to fuse completely with the base metal or the previously deposited weld metal. This can occur due to various reasons such as improper welding technique, inadequate heat input, or contamination. Lack of fusion can weaken the weld joint and compromise its integrity, leading to potential structural failures or leaks. Therefore, it is important to ensure proper fusion during the welding process to maintain the quality and strength of the fabrication.

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  • 14. 

    Developing powder should always  be:

    • Highly fluorescent

    • Applied wet

    • Colorless

    • Evenly applied

    Correct Answer
    A. Evenly applied
    Explanation
    Developing powder should always be evenly applied in order to achieve accurate and consistent results. Uneven application can lead to patchy or incomplete development, making it difficult to interpret the results. By ensuring that the powder is spread evenly, it provides a uniform surface for the development process, enhancing the visibility of any latent prints present on the surface. This allows for better analysis and identification of the prints, aiding in forensic investigations and crime scene analysis.

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  • 15. 

    Developer assists in the detection of penetrants retained in the discontinunities by aidingthe

    • Post cleaning process

    • Emulsification process

    • Bleed-out process

    • Drying process

    Correct Answer
    A. Bleed-out process
    Explanation
    The developer assists in the detection of penetrants retained in the discontinuities by aiding the bleed-out process. During the bleed-out process, the penetrant that has seeped into the discontinuities is allowed to "bleed out" or migrate to the surface. The developer helps to draw out and highlight these penetrants, making them more visible and easier to detect. This process is crucial in non-destructive testing methods such as liquid penetrant testing, where the developer plays a vital role in revealing any defects or flaws in the material being tested.

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  • 16. 

    Which of the following is not a good practice when penetrant testing?

    • Applying emulsifier by dipping the part in emulsifier

    • Appling developer by sprayingthe part with developer

    • Removal of water-washable penetrant with a water spray

    • Applying emulsifier with a brush

    Correct Answer
    A. Applying emulsifier with a brush
    Explanation
    Applying emulsifier with a brush is not a good practice when conducting penetrant testing because it can lead to uneven application and inadequate coverage of the part. This can result in missed indications or false readings during the testing process. It is recommended to apply emulsifier by dipping the part or using other methods that ensure uniform coverage and proper penetration of the penetrant into any surface defects.

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  • 17. 

    An important difference between non water-washable penetrants and water-washable penetrants is that:

    • Water-washable penetrants contain an emulsifier, while non waterwashable penetrants do not

    • The viscosity of the two penetrants is different

    • The color of the two penetrants is different

    • Non water-washable penetrants are more easily removed than are water washable penetrants.

    Correct Answer
    A. Water-washable penetrants contain an emulsifier, while non waterwashable penetrants do not
    Explanation
    Water-washable penetrants contain an emulsifier, which allows them to be easily washed away with water after the inspection process. On the other hand, non water-washable penetrants do not contain an emulsifier, making them more difficult to remove. This difference in composition is what sets the two types of penetrants apart. The viscosity and color of the penetrants are not mentioned in the explanation and are therefore not relevant to the correct answer.

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  • 18. 

    The term " non-relevant indication" is used to describe certain types of penetrant testing indications. which of the following would be a typical non-relevant indication?

    • Indications due to part geometry or part design configurations

    • Nonmagnetic indications

    • Multiple indications

    • Non-linear indications

    Correct Answer
    A. Indications due to part geometry or part design configurations
    Explanation
    Indications due to part geometry or part design configurations would be considered a typical non-relevant indication in penetrant testing. This means that the indications are not caused by any defects or flaws in the material being tested, but rather by the shape or design of the part itself. These indications do not indicate any potential issues with the part's structural integrity or performance, and therefore can be considered non-relevant in the context of the testing process.

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  • 19. 

    Which of the following methods for applying non-aqueous developer is normally consideredmost effective?

    • Spraying

    • Swabbing

    • Brushing

    • Dipping

    Correct Answer
    A. Spraying
    Explanation
    Spraying is considered the most effective method for applying non-aqueous developer because it allows for even and consistent coverage over the surface being inspected. This method ensures that the developer is evenly distributed and penetrates into any surface cracks or defects, providing better visibility of indications. It also allows for a faster and more efficient application compared to other methods such as swabbing, brushing, or dipping, which may result in uneven coverage or require more time and effort. Overall, spraying is preferred for its effectiveness in achieving accurate and reliable inspection results.

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  • 20. 

    Which of the following is an advantage of visible dye over fluorescent penetrants?

    • Small indications are easily seen

    • They can be used on anodized and chomate surfaces

    • They make less background on rough surfaces

    • No special lighting is required

    Correct Answer
    A. No special lighting is required
    Explanation
    Visible dye penetrants do not require special lighting because they are easily visible to the naked eye. This means that they can be used in various lighting conditions without the need for additional equipment or specific lighting setups. This advantage makes visible dye penetrants more convenient and cost-effective compared to fluorescent penetrants, which require UV lighting to detect indications.

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  • 21. 

    Dry developer should be applied :

    • So that a heavy coat of developer covers all surfaces

    • So that a light dusting covers all surfaces to be inspected

    • With a dry paint brush

    • By dipping

    Correct Answer
    A. So that a light dusting covers all surfaces to be inspected
    Explanation
    Applying a dry developer with a light dusting ensures that all surfaces to be inspected are covered. This method allows for better visibility and detection of any defects or irregularities on the surfaces. A heavy coat of developer may result in excessive buildup, making it difficult to identify smaller flaws. Using a dry paint brush or dipping may not provide an even distribution of the developer, leading to inconsistent inspection results. Therefore, a light dusting is the most appropriate method for applying dry developer.

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  • 22. 

    A continuous line indication can be caused by which of the following discontinuities?

    • Porosity

    • Slag inclusions

    • Pitting

    • Cracks

    Correct Answer
    A. Cracks
    Explanation
    Cracks can cause a continuous line indication on a material. Unlike porosity, which appears as isolated voids, cracks form a continuous line and can extend throughout the material. Similarly, slag inclusions and pitting also appear as isolated defects rather than continuous lines. Therefore, cracks are the most likely cause for a continuous line indication.

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  • 23. 

    Pentrant residues may become entrapped under splines, fasteners, rivets, etc. Which of the following is the most likely reaction caused by such a residue.

    • Corrosion caused by the moisture attracted by such residues

    • Paint stripping

    • Fatigue cracking

    • Lattiice structure breakdown

    Correct Answer
    A. Corrosion caused by the moisture attracted by such residues
    Explanation
    When residues become entrapped under splines, fasteners, rivets, etc., they can create a barrier that traps moisture. This trapped moisture can lead to corrosion of the metal surfaces over time. The presence of the residue attracts and holds moisture against the metal, accelerating the corrosion process. Therefore, the most likely reaction caused by such a residue is corrosion caused by the moisture attracted by the residue.

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  • 24. 

    Prior to penetrant testing ot a previously machined soft metal part, which of the the cleaning methods listed below would be best  remove any smeared metal that could mask discontinuities?

    • Etching

    • Shot peening

    • Alkaline cleaning

    • Water cleaning with detergents

    Correct Answer
    A. Etching
    Explanation
    Etching would be the best cleaning method to remove smeared metal that could mask discontinuities in a previously machined soft metal part prior to penetrant testing. Etching involves using a chemical solution to remove a thin layer of the metal surface, revealing any hidden defects or discontinuities. This process helps to ensure that the penetrant testing can accurately detect any flaws in the part.

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  • 25. 

    Which of the following discontinuities might be found in rolled plate?

    • Laminations

    • Shrinkage

    • Lack of fusion

    • Undercut

    Correct Answer
    A. Laminations
    Explanation
    Laminations are a type of discontinuity that can be found in rolled plate. Laminations are layers or plates of material that are not bonded together properly during the rolling process, resulting in weak spots or separations within the plate. These laminations can affect the structural integrity of the plate and may cause it to fail under certain conditions. Therefore, it is important to detect and address any laminations in rolled plate to ensure its quality and performance.

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  • 26. 

    Which of the following discontinuities could be classified as a service induced discontinuity?

    • Fatigue crack

    • Porosity

    • Machine tear

    • Lap

    Correct Answer
    A. Fatigue crack
    Explanation
    A fatigue crack could be classified as a service induced discontinuity because it is caused by repeated loading and unloading of a material, leading to the formation and propagation of cracks over time. This type of crack typically occurs in materials subjected to cyclic stress or fatigue, such as in service components or structures. Therefore, a fatigue crack can be considered a discontinuity that is induced by the service conditions and usage of the material.

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  • 27. 

    When using a flourescent, post-emulsifiable penetrant, the length of time the emulsifier is allowed to remain on the part is critical when detecting shallow scratch like discontintities. the best length of time should be: 

    • 10 seconds

    • 5 seconds

    • 2 to 3 seconds

    • Determined by experimentation

    Correct Answer
    A. Determined by experimentation
    Explanation
    The length of time the emulsifier is allowed to remain on the part is critical when detecting shallow scratch-like discontinuities. This means that there is no specific or fixed length of time that can be determined as the best. It varies depending on the specific situation and the depth of the discontinuities. Therefore, the best length of time should be determined by experimentation, where different durations are tested to find the most effective time for detecting the desired discontinuities.

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  • 28. 

    Water-washable liquid penetrants differ from post-emulsification penetrants in that water-washable penetrants:

    • Can only be used on aluminum test specimens

    • Need not be removed from the surfaces prior to development

    • Have a soapy base

    • Do not need the application of an emulsifier before rinsing

    Correct Answer
    A. Do not need the application of an emulsifier before rinsing
    Explanation
    Water-washable liquid penetrants do not need the application of an emulsifier before rinsing. This means that after the penetrant has been applied and allowed to dwell on the surface, it can be rinsed off directly with water without the need for an additional emulsifier. This is different from post-emulsification penetrants, which require the application of an emulsifier before rinsing to remove excess penetrant from the surface.

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  • 29. 

    The tendency of a liquid penetrant to enter a discontinuity is primarily related to:

    • The viscosity of the penetrant

    • The capillary forces

    • The chemical inertness of the penetrant

    • The specific gravity of the penetrant

    Correct Answer
    A. The capillary forces
    Explanation
    The capillary forces play a significant role in the tendency of a liquid penetrant to enter a discontinuity. Capillary forces are responsible for the liquid's ability to flow against gravity and enter narrow spaces, such as cracks or pores. These forces are a result of the cohesive forces between the liquid molecules and the adhesive forces between the liquid and the surface of the discontinuity. Therefore, the capillary forces enable the liquid penetrant to effectively penetrate and fill the discontinuity, making it a primary factor in this process.

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  • 30. 

    When conducting a penetrant test , spherical indications on the surface of a part could be indicative of:

    • Fatigue cracks

    • Porosity

    • Weld laps

    • Hot tears

    Correct Answer
    A. Porosity
    Explanation
    Spherical indications on the surface of a part during a penetrant test could be indicative of porosity. Porosity refers to the presence of small holes or voids in the material, which can appear as spherical shapes on the surface. This can be caused by various factors such as improper casting or welding techniques, inadequate material flow, or gas entrapment during manufacturing processes. Identifying porosity is important as it can weaken the structural integrity of the part and affect its performance.

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  • 31. 

    Developer assists in the detection of the visible dye penetrant test method by:

    • Providing a clean surface

    • Providing a contrasting background

    • Providing a dry surface

    • Emulsifying the penetrant bleed-out

    Correct Answer
    A. Providing a contrasting background
    Explanation
    The developer assists in the detection of the visible dye penetrant test method by providing a contrasting background. This means that the developer creates a background against which the dye penetrant can be easily seen and detected. By providing a contrasting background, the developer enhances the visibility of any defects or indications that may be present on the surface being tested.

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  • 32. 

    Which of the following characteristics are normally considered when selecting the type of penetrant to be used in a penetrant test?

    • Removal characteristics of the penetrant

    • The flash point of the penetrant

    • The cost of the penetrant

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    When selecting the type of penetrant to be used in a penetrant test, several characteristics are normally considered. The removal characteristics of the penetrant are important as they determine how easily the penetrant can be removed from the surface after the test is completed. The flash point of the penetrant is also considered as it indicates the temperature at which the penetrant can ignite, which is crucial for safety reasons. Additionally, the cost of the penetrant is taken into account to ensure that it is affordable and within budget. Therefore, all of the above characteristics are considered when selecting the type of penetrant for a penetrant test.

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  • 33. 

    Which of the following is an advantage of solvent wipe methods over water-wasing?

    • No special lighting is necessary during inspection

    • They provide a quicker penetration of small openings

    • Small indications are more easily seen

    • They can easily be carried out in the field and remote areas

    Correct Answer
    A. They can easily be carried out in the field and remote areas
    Explanation
    Solvent wipe methods have the advantage of being easily carried out in the field and remote areas. This means that they can be performed in locations that may not have access to water or other washing facilities. This flexibility allows for inspections to be conducted in various environments, making solvent wipe methods a practical choice in situations where water-washing may not be feasible.

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  • 34. 

    When viewing parts, fluorescent background may indicate:

    • Poor washing

    • Insufficient emulsifying time(post emulsification method)

    • Porous material and coating

    • Improper cleaning before penetrant cycle

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The correct answer is "All of the above" because a fluorescent background can indicate poor washing, insufficient emulsifying time (in the post emulsification method), porous material and coating, and improper cleaning before the penetrant cycle. A fluorescent background is a sign that there are contaminants present on the surface being inspected, which can affect the accuracy and reliability of the inspection process. Therefore, all of these factors can contribute to the presence of a fluorescent background.

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  • 35. 

    Shrinkage cracks are usually found in what areas of a casting?

    • Thin sections only

    • Heavy sections only

    • Abrupt changes in thickness

    • No longer a problem

    Correct Answer
    A. Abrupt changes in thickness
    Explanation
    Shrinkage cracks are usually found in abrupt changes in thickness of a casting. This is because when the casting cools and solidifies, different sections of varying thickness cool at different rates. The thicker sections cool more slowly, causing the material to shrink unevenly. This uneven shrinkage creates stress in the material, leading to the formation of cracks. Therefore, abrupt changes in thickness create a higher risk for shrinkage cracks to occur in a casting.

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  • 36. 

    Which of the items listed below is NOT an advantage of the liquid penetrant test method?

    • The method can find all types of discontinuties

    • The method is simple in principle and relatively easy to understand.

    • The method is essentially simple in application.

    • There are few limitations on the size and shape of the article that can be treated by this method.

    Correct Answer
    A. The method can find all types of discontinuties
    Explanation
    The given answer is correct because the liquid penetrant test method is not capable of finding all types of discontinuities. While it is effective for detecting surface-breaking defects, it may not be as effective for detecting subsurface or internal defects. Therefore, this method has limitations in its ability to find all types of discontinuities.

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  • 37. 

    Which of the test part characteristics listed below are normally considered before the specific liquid penetrant test method is selected?

    • The kind and size of discontinuities most likely to occur

    • The intended application for the part

    • The surface finish of the part

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Before selecting a specific liquid penetrant test method, it is important to consider the kind and size of discontinuities most likely to occur, the intended application for the part, and the surface finish of the part. These factors play a crucial role in determining the appropriate test method as different methods may be more suitable for detecting specific types of discontinuities or may be better suited for parts with certain surface finishes. Therefore, considering all of these characteristics is necessary for selecting the most effective liquid penetrant test method.

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  • 38. 

    Why is it advisible to have a blacklight installed at the wash station?

    • So that inspection can be done without drying parts

    • To speed the bleeding of penetrant out of defects

    • To check the effectiveness of the wash cycle

    • To determine if parts have been covered with penetrant

    Correct Answer
    A. To check the effectiveness of the wash cycle
    Explanation
    Having a blacklight installed at the wash station allows for the effectiveness of the wash cycle to be checked. This is because the blacklight can reveal any remaining penetrant on the parts after the wash cycle. By using the blacklight, inspectors can easily determine if the parts have been thoroughly cleaned or if there is still penetrant present. This ensures that the wash cycle is doing its job properly and that the parts are clean before further inspection or processing.

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  • 39. 

    When penetrant testing titanium alloys, the materials used in the penetrant system shouldnot contain any constituent quantities of:

    • Carbon or oil

    • Halogenated solvents

    • Emulsifier or oil

    • Fluorescent agent

    Correct Answer
    A. Halogenated solvents
    Explanation
    Halogenated solvents should not be present in the materials used in the penetrant system when testing titanium alloys. This is because halogenated solvents can react with titanium and cause corrosion or degradation of the alloy. Therefore, to ensure the integrity of the titanium, it is important to avoid using materials that contain halogenated solvents.

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  • 40. 

    Which factor would apply in determining the dwell time required for the penetrant to be effective?

    • Type of discontinuity sought

    • Shape of part

    • Size of part

    • Surface roughness

    Correct Answer
    A. Type of discontinuity sought
    Explanation
    The dwell time required for the penetrant to be effective would depend on the type of discontinuity sought. Different types of discontinuities may require different amounts of time for the penetrant to fully penetrate and reveal the discontinuity.

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  • 41. 

    Flourescent materials used in flourescent penetrants respond most actively to radiant energy, of a wave length of approximately:

    • 7,000 Angstroms

    • 250 KV

    • 3,650 Angstroms

    • 100 foot candles

    Correct Answer
    A. 3,650 Angstroms
    Explanation
    Fluorescent materials used in fluorescent penetrants respond most actively to radiant energy with a wavelength of approximately 3,650 Angstroms. This means that when exposed to this specific wavelength of energy, these materials will emit light of a different color, making them useful for detecting surface defects or cracks in materials. The other options, 7,000 Angstroms, 250 KV, and 100 foot candles, do not correspond to the optimal wavelength for the fluorescence process.

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  • 42. 

    Which of the statements below apply to the liquid penetrant method of testing?

    • The penetrant test method is less flexible than eddy current test method

    • The penetrant test method is less reliable than the magnetic particle method for finding surface defects in ferromagnetic materials.

    • The penetrant test method will not detect fatigue cracks.

    • The penetrant test method is more reliable tha radioraphic testing when attempting to detect minute surface discontinuities.

    Correct Answer
    A. The penetrant test method is more reliable tha radioraphic testing when attempting to detect minute surface discontinuities.
    Explanation
    The given correct answer states that the penetrant test method is more reliable than radiographic testing when attempting to detect minute surface discontinuities. This means that when it comes to finding small surface defects, the penetrant test method is considered to be more dependable compared to radiographic testing.

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  • 43. 

    Which of the following discontinuities might be found in rolled bar stock?

    • Shrinkage

    • Bleedout

    • Laps

    • Undercut

    Correct Answer
    A. Laps
    Explanation
    Laps are a type of discontinuity that can be found in rolled bar stock. Laps occur when there is a folding or overlapping of the metal during the rolling process, resulting in a weak area in the bar. This can lead to reduced strength and potential failure of the bar. Therefore, it is important to inspect rolled bar stock for laps to ensure its quality and integrity.

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  • 44. 

    Which of the following is a discontinuitity that might be found in rolled bar stock?

    • Blow holes

    • Shrinkage laps

    • Cracks and seams

    • Insufficient penetration

    Correct Answer
    A. Cracks and seams
    Explanation
    Cracks and seams are a type of discontinuity that can be found in rolled bar stock. Cracks are fractures that occur in the material, while seams are lines or ridges formed during the rolling process. These discontinuities can weaken the structural integrity of the bar stock and affect its performance.

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  • 45. 

    When using post-emulsification penetrants, difficulties incurred during the washing operationcan be overcome by:

    • Reapplying a coat of emulsifier

    • Increasing the water pressure used during the washing operation

    • Completely reprocessing the part from surface preparation on and by using a longer emulsifier time.

    • Dipping the part in boiling water

    Correct Answer
    A. Completely reprocessing the part from surface preparation on and by using a longer emulsifier time.
  • 46. 

    Which of the following is most apt to render the post-emulsification test ineffective?

    • Too long of a pentrant time

    • Too long of a developing time

    • Too long of an emulsifying time

    • None of the above

    Correct Answer
    A. Too long of an emulsifying time
    Explanation
    If the emulsifying time is too long, it means that the emulsion is being allowed to sit for an extended period of time before the post-emulsification test is conducted. This can lead to excessive emulsification, which may result in inaccurate test results. The purpose of the post-emulsification test is to determine the stability of the emulsion, and if the emulsifying time is too long, it may cause the emulsion to become too stable, making it difficult to accurately assess its stability.

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  • 47. 

    Which of the following is a discontinuity that might be found in rolled bar stock?

    • Blow hole

    • Shrinkage lap

    • Crack or seam

    • Laco of penetration

    Correct Answer
    A. Crack or seam
    Explanation
    A crack or seam is a type of discontinuity that can be found in rolled bar stock. This refers to a separation or opening in the material, which can weaken its structural integrity. Cracks or seams can occur during the rolling process due to various factors such as improper cooling, excessive rolling pressure, or material defects. These discontinuities can compromise the quality and strength of the bar stock, making it unsuitable for certain applications.

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  • 48. 

    Which of the following discontinuities could be classified as a primary processing discontinuity often found in cast material?

    • Fatigue crack

    • Stress-corrosion

    • Porosity

    • Lack of penetration

    Correct Answer
    A. Porosity
    Explanation
    Porosity is a type of discontinuity often found in cast material. It refers to the presence of voids or gas pockets within the material, which can weaken its structural integrity. Porosity can occur during the casting process when gases get trapped in the molten metal and solidify, resulting in the formation of voids. This type of discontinuity is considered a primary processing discontinuity because it is directly related to the manufacturing process. In contrast, fatigue cracks, stress-corrosion, and lack of penetration are discontinuities that can occur after the material has been manufactured and are not specific to the casting process.

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  • 49. 

    When performing a liquid penetrant test using solvent removable dye penetrant, ther are several ways to remove excess penetrant from the surface of the part. Which of the methods listed belowis generally regarded as most suitable for giving accurate test results?

    • Squirting solvent over the surface with no more than 40 psi pressure

    • Wiping with a soaking wet cloth, then wiping with a dry cloth

    • Wiping with a solvent dampened cloth, then wiping with dry cloths

    • Wiping with dry paper wipes, then wiping with a solvent dampened cloth, and finally wiping with dry colth

    Correct Answer
    A. Wiping with dry paper wipes, then wiping with a solvent dampened cloth, and finally wiping with dry colth
    Explanation
    The most suitable method for removing excess penetrant from the surface of the part is wiping with dry paper wipes, followed by wiping with a solvent dampened cloth, and finally wiping with a dry cloth. This method ensures that all excess penetrant is effectively removed without leaving any residue on the surface, which could potentially interfere with the accuracy of the test results.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 27, 2010
    Quiz Created by
    Ndtputz

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