McqMate
Chapters
| 1. |
Liquid penetrant testing is based on the principle of: |
| A. | Polarized sound waves in a liquid |
| B. | Magnetic domains |
| C. | Absorption of X rays |
| D. | Capillary action |
| Answer» D. Capillary action | |
| 2. |
When a small diameter tube is placed in a glass of water, water rises in the tube to a level above the adjacent surface. This is called: |
| A. | Viscosity |
| B. | Capillary action |
| C. | Surface tension |
| D. | Barometric testing |
| Answer» B. Capillary action | |
| 3. |
How is the size of a liquid penetrant indication usually related to the discontinuity it represents: |
| A. | Larger than |
| B. | Smaller than |
| C. | Equal to |
| D. | Not related to |
| Answer» A. Larger than | |
| 4. |
A penetrant that is self-emulsifying is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post-emulsified |
| D. | Dual sensitivity method |
| Answer» B. Water washable | |
| 5. |
A penetrant process which employs an emulsifier as a separate step in the penetrant removal process is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post-emulsified |
| D. | Dual sensitivity method |
| Answer» C. Post-emulsified | |
| 6. |
A penetrant process in which excess penetrant is removed with an organic solvent is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post-emulsified |
| D. | Dual method |
| Answer» A. Solvent removable | |
| 7. |
Which of the following statements accurately describes the capabilities of liquid penetrant testing? |
| A. | Liquid penetrant testing is useful for locating subsurface discontinuities in a test piece |
| B. | Liquid penetrant testing is useful for locating discontinuities in porous materials |
| C. | Liquid penetrant testing is useful for locating discontinuities which are open to the surface in non-porous materials |
| D. | none of the above |
| Answer» C. Liquid penetrant testing is useful for locating discontinuities which are open to the surface in non-porous materials | |
| 8. |
Which of the following discontinuity types could typically be found with a liquid penetrant test? |
| A. | Internal slag in a weld |
| B. | Internal slag in a casting |
| C. | Sensitization in austenitic stainless steel |
| D. | Fatigue cracks |
| Answer» D. Fatigue cracks | |
| 9. |
Which of the following chemical elements are normally held to a minimum in liquid penetrant materials, when testing stainless steel and titanium? |
| A. | Hydrogen |
| B. | Chlorine |
| C. | Carbon |
| D. | Oil |
| Answer» B. Chlorine | |
| 10. |
Which of the following chemical elements are normally held to a minimum in liquid penetrant materials when testing nickel based alloys? |
| A. | Sulphur |
| B. | Oxygen |
| C. | Carbon |
| D. | Nitrogen |
| Answer» A. Sulphur | |
| 11. |
Which of the following is the most desirable method of pre-cleaning a test piece prior to penetrant testing? |
| A. | Sand blasting |
| B. | Vapour degreasing |
| C. | Emery cloth |
| D. | Wire brushing |
| Answer» B. Vapour degreasing | |
| 12. |
Which of the following pre-cleaning processes is not recommended? |
| A. | Detergent cleaning |
| B. | Vapour degreasing |
| C. | Shot blasting |
| D. | Ultrasonic cleaning |
| Answer» C. Shot blasting | |
| 13. |
A wire brush should be used for pre-cleaning: |
| A. | When grease and oil must be removed |
| B. | Only as a last resort |
| C. | When rust is to be removed |
| D. | When grinding burrs must be removed |
| Answer» C. When rust is to be removed | |
| 14. |
A hydrometer is used to measure: |
| A. | Penetrant viscosity |
| B. | Specific gravity of water based wet developers |
| C. | Penetrant specific gravity |
| D. | Cleaner specific gravity |
| Answer» B. Specific gravity of water based wet developers | |
| 15. |
Visible, solvent removable penetrants are most advantageous for: |
| A. | Inspecting parts with rough surfaces |
| B. | Inspecting batches of small parts |
| C. | Inspecting parts at remote locations |
| D. | Inspecting parts with porous surfaces |
| Answer» C. Inspecting parts at remote locations | |
| 16. |
For adequate test results, the black light used in fluorescent penetrant examination should provide what minimum black light intensity at the test surface? |
| A. | 100 foot candles per square centimetre |
| B. | 1000 microwatts per square centimetre |
| C. | 800 foot candles |
| D. | 35 microwatts per square centimetre |
| Answer» B. 1000 microwatts per square centimetre | |
| 17. |
What minimum warm-up time is required for acceptable performance of a mercury Vapour arc black light? |
| A. | None |
| B. | 2 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» C. 5 minutes | |
| 18. |
Which of the following penetrants contains an emulsifying agent? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» B. Water washable | |
| 19. |
Which of the following penetrants must be treated with an emulsifier prior to water removal? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 20. |
What is the function of an emulsifier? |
| A. | To remove the excess penetrant |
| B. | To develop indications with a post emulsifiable penetrant system |
| C. | To assist penetration with a post emulsifiable penetrant system |
| D. | To make a post emulsifiable penetrant water washable |
| Answer» D. To make a post emulsifiable penetrant water washable | |
| 21. |
An oil based emulsifier is called: |
| A. | Hydrophilic |
| B. | Hydrophobic |
| C. | Lipophilic |
| D. | Fluoroscopic |
| Answer» C. Lipophilic | |
| 22. |
A water based emulsifier is called: |
| A. | Hydrophilic |
| B. | Hydrophobic |
| C. | Lipophilic |
| D. | Fluoroscopic |
| Answer» A. Hydrophilic | |
| 23. |
Methylene chloride, isopropyl, alcohol, naptha and mineral spirits are examples of: |
| A. | Emulsifiers |
| B. | Developers |
| C. | Solvent removers |
| D. | None of the above |
| Answer» C. Solvent removers | |
| 24. |
What type of solvent removers may be used with a solvent removable penetrant? |
| A. | Any organic solvent |
| B. | Only the cleaner recommended by the manufacturer of the penetrant |
| C. | Any alcohol based solvents |
| D. | Only chlorinated hydrocarbons |
| Answer» B. Only the cleaner recommended by the manufacturer of the penetrant | |
| 25. |
Which of the following is a prerequisite for a penetrant test? |
| A. | Developer must be applied in a thin, even coat |
| B. | Any surface coatings or soils must be completely removed |
| C. | All traces of penetrant materials should be removed after testing is complete |
| D. | The test object must be non-magnetic |
| Answer» B. Any surface coatings or soils must be completely removed | |
| 26. |
Which of the following types of pre-cleaning processes may be used for liquid penetrant testing? |
| A. | Wire brushing only |
| B. | Detergent and water only |
| C. | Vapour degreasing only |
| D. | Any process that leaves the part clean and dry, does not harm the part and is |
| Answer» D. Any process that leaves the part clean and dry, does not harm the part and is | |
| 27. |
What is the likely result of incomplete removal of all excess penetrant from the test piece surface? |
| A. | Formation of false indications |
| B. | Formation of relevant indications |
| C. | Exaggeration of the size of relevant indications |
| D. | None of the above |
| Answer» A. Formation of false indications | |
| 28. |
What is the preferred pre-cleaning process for removal of oil and grease : |
| A. | Steam cleaning with a added acid |
| B. | Vapour degreasing |
| C. | Steam cleaning |
| D. | Ultrasonic cleaning |
| Answer» B. Vapour degreasing | |
| 29. |
Which pre-cleaning method may be used with either a solvent or a detergent solution? |
| A. | Ultrasonic cleaning |
| B. | Steam cleaning |
| C. | Detergent wash |
| D. | Vapour degreasing |
| Answer» A. Ultrasonic cleaning | |
| 30. |
What is the danger associated with using a wire brush during pre-cleaning? |
| A. | Bristles from the wire brush may cause false indications |
| B. | Contaminants from the wire brush may cause delayed hydrogen cracking of high carbon steels |
| C. | The wire brush may not adequately remove organic soils |
| D. | The wire brush may close or smear metal over |
| Answer» D. The wire brush may close or smear metal over | |
| 31. |
What is the preferred method of removing paint prior to performing a penetrant testing? |
| A. | Sand blast |
| B. | Chemical removers |
| C. | Power wire brush |
| D. | Shot blast |
| Answer» B. Chemical removers | |
| 32. |
What additional surface preparation or cleaning must be performed on a machined or ground aluminium casting prior to penetrant testing? |
| A. | Vapour degreasing |
| B. | Etching |
| C. | Detergent wash |
| D. | Nothing |
| Answer» B. Etching | |
| 33. |
Acceptable methods of penetrant application are: |
| A. | Spraying |
| B. | Dipping |
| C. | Brushing |
| D. | All of the above |
| Answer» D. All of the above | |
| 34. |
The time period during which penetrant remains on the surface of the test piece is called: |
| A. | Dwell time |
| B. | Soaking time |
| C. | Fixing time |
| D. | Development time |
| Answer» A. Dwell time | |
| 35. |
Excess penetrant removal is a two step process with which of the following penetrant methods? |
| A. | Water washable |
| B. | Post emulsifiable |
| C. | Solvent removable |
| D. | Liquid oxygen applications |
| Answer» B. Post emulsifiable | |
| 36. |
A developer aids penetrant bleed out because of: |
| A. | Adequate removal of the excess penetrant |
| B. | Providing a contrasting background for visible dye indications |
| C. | Capillary action |
| D. | Proper emulsifier action |
| Answer» C. Capillary action | |
| 37. |
In the solvent removable penetrant process, excess penetrant is removed with: |
| A. | A water spray |
| B. | A hydrophilic scrubber |
| C. | A solvent spray |
| D. | Clean, lint free towels slightly moistened with solvent |
| Answer» D. Clean, lint free towels slightly moistened with solvent | |
| 38. |
Water based wet developer is applied: |
| A. | Immediately before removal of excess penetrant |
| B. | Immediately after removal of excess penetrant |
| C. | After a drying period following removal of excess penetrant |
| D. | For maximum sensitivity results |
| Answer» B. Immediately after removal of excess penetrant | |
| 39. |
Non-aqueous wet developer is applied: |
| A. | Immediately before removal of excess penetrant |
| B. | Immediately after removal of excess penetrant |
| C. | After the excess penetrant is removed and part surface is dried |
| D. | For maximum sensitivity results |
| Answer» C. After the excess penetrant is removed and part surface is dried | |
| 40. |
Dry developer is applied: |
| A. | Immediately before removal of excess penetrant |
| B. | Immediately after removal of excess penetrant |
| C. | After drying of the part |
| D. | For maximum sensitivity results |
| Answer» C. After drying of the part | |
| 41. |
Typical ranges of emulsifier dwell times are: |
| A. | 5 to 10 minutes |
| B. | 30 seconds to 1 minute |
| C. | 1 to 3 minutes |
| D. | 5 to 10 minutes |
| Answer» C. 1 to 3 minutes | |
| 42. |
Actual emulsification times are determined by: |
| A. | Experiment, during technique qualification |
| B. | Manufacturer's recommendations |
| C. | Code requirements |
| D. | None of the above |
| Answer» A. Experiment, during technique qualification | |
| 43. |
The colour of fluorescent penetrant under the presence of a UV light is: |
| A. | Yellow-green |
| B. | Red |
| C. | Blue |
| D. | Green |
| Answer» A. Yellow-green | |
| 44. |
What action is necessary if the penetrant is inadvertently allowed to dry on the test piece? |
| A. | Repeat the test, beginning with the pre-cleaning operation |
| B. | Re-wet the penetrant, begin dwell time again and continue |
| C. | Clean the penetrant off the surface and develop normally |
| D. | Clean the penetrant off the surface, wait 5 minutes and develop normally |
| Answer» A. Repeat the test, beginning with the pre-cleaning operation | |
| 45. |
What maximum water rinse pressure is considered safe for removal of excess penetrant in the water washable penetrant process? |
| A. | As low a pressure as possible, 50 PSI maximum |
| B. | to 200 PSI |
| C. | PSI maximum |
| D. | to 500 PSI |
| Answer» A. As low a pressure as possible, 50 PSI maximum | |
| 46. |
During the water rinse step of the water washable penetrant process, what is the desired angle of the spray to the surface? |
| A. | Normal |
| B. | 30 degrees |
| C. | 45 degrees |
| D. | 75 degrees |
| Answer» C. 45 degrees | |
| 47. |
Which type of emulsifier is designed to be used as a ‘scrubber’? |
| A. | Hydrophilic |
| B. | Hydrophobic |
| C. | Lipophilic |
| D. | Fluoroscopic |
| Answer» A. Hydrophilic | |
| 48. |
Post cleaning is especially important when: |
| A. | Post emulsified penetrants are used |
| B. | Phosphate containing detergents are used |
| C. | Chlorinated hydrocarbons are used |
| D. | The test object will be used in a liquid oxygen environment |
| Answer» D. The test object will be used in a liquid oxygen environment | |
| 49. |
When using a hydrophilic emulsifier, the amount of penetrant removed is most affected by: |
| A. | Solution strength and time of spray |
| B. | Penetrant dwell time |
| C. | Emulsifier dwell time |
| D. | Adequacy of pre-clean |
| Answer» A. Solution strength and time of spray | |
| 50. |
If a mercury vapour arc black light is inadvertently turned off, how soon may it be restarted? |
| A. | Immediately |
| B. | 5 minutes |
| C. | 10 minutes |
| D. | 15 minutes |
| Answer» C. 10 minutes | |
| 51. |
Which of the following is normally prohibited as a method of removing excess penetrant when using the solvent removable penetrant process? |
| A. | A water spray |
| B. | A hydrophilic scrubber |
| C. | A solvent spray |
| D. | Clean with lint free towels moistened with solvent |
| Answer» C. A solvent spray | |
| 52. |
When performing a fluorescent penetrant examination, excess penetrant is normally removed: |
| A. | By a hydrophilic scrubber |
| B. | Under UV light |
| C. | By solvent spray |
| D. | By vapour degreasing |
| Answer» B. Under UV light | |
| 53. |
During a visible, solvent removable penetrant test, complete penetrant removal is indicated by: |
| A. | Absence of red indications on the test piece surface |
| B. | Clean rinse water |
| C. | Completion of the rinse cycle |
| D. | Absence of red dye on the cleaning towels |
| Answer» D. Absence of red dye on the cleaning towels | |
| 54. |
Which of the following is a function of a developer |
| A. | Providing a contrasting background for visible dye indications |
| B. | Making the penetrant water washable |
| C. | Penetrating into discontinuities open to the surface |
| D. | Dissolve organic soils on the test piece surface |
| Answer» A. Providing a contrasting background for visible dye indications | |
| 55. |
Which of the following is a function of a developer? |
| A. | Providing a contrasting background for visible dye indications |
| B. | Accentuates presence of discontinuities by causing a penetrant indication to spread out over a larger area |
| C. | Provides capillary paths to aid the bleed out process |
| D. | All of the above |
| Answer» D. All of the above | |
| 56. |
Which of the following developers is applied before the drying operation? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water based wet |
| D. | None of the above |
| Answer» C. Water based wet | |
| 57. |
The most sensitive type of developer for the detection of fine discontinuities is: |
| A. | Water soluble |
| B. | Non-aqueous wet |
| C. | Dry |
| D. | Water suspendable |
| Answer» B. Non-aqueous wet | |
| 58. |
Which of the following is the most sensitive developer in descending order? |
| A. | Dry, water soluble, water suspendable |
| B. | Non-aqueous wet, water soluble, water suspendable ,dry |
| C. | Non-aqueous wet, dry, water soluble |
| D. | Water suspendable, water soluble, non-aqueous wet |
| Answer» B. Non-aqueous wet, water soluble, water suspendable ,dry | |
| 59. |
Low sulphur and chlorine penetrant materials would be used for testing: |
| A. | Aluminium, steel and plastics |
| B. | Tool steels, chrome vanadium steel and ferritic stainless steels |
| C. | Austenitic stainless steels, nickel alloys and titanium |
| D. | Magnetic materials |
| Answer» C. Austenitic stainless steels, nickel alloys and titanium | |
| 60. |
Which type of developer may be either in suspension or a solution? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water based wet |
| D. | None of the above |
| Answer» C. Water based wet | |
| 61. |
The temperature of water rinse used in the water washable penetrant process should be: |
| A. | 60 to 110oC |
| B. | 40 to 100oC |
| C. | 16 to 43oC |
| D. | 70 to 140oC |
| Answer» C. 16 to 43oC | |
| 62. |
The danger of over washing during a water washable penetrant test is that: |
| A. | Excess penetrant will be removed from the test piece |
| B. | Penetrant will be removed from discontinuities |
| C. | The waste water will contain too high a concentration of penetrants |
| D. | A protective oxide coating on the test piece is formed |
| Answer» B. Penetrant will be removed from discontinuities | |
| 63. |
Which penetrant process is best suited to high production rates of many small parts? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» B. Water washable | |
| 64. |
Which penetrant process is best suited to detect shallow discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 65. |
Which penetrant process is best suited to the detection of discontinuities in a test piece having threads and keyways? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» B. Water washable | |
| 66. |
Which penetrant process is the most sensitive to detect fine discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable fluorescent |
| D. | Water washable fluorescent |
| Answer» C. Post emulsifiable fluorescent | |
| 67. |
Which penetrant process is best suited for portable application in the field? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» A. Solvent removable | |
| 68. |
Which penetrant process should be used if repeated examinations are anticipated? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» A. Solvent removable | |
| 69. |
What is a disadvantage of using the fluorescent penetrant process? |
| A. | Lower visibility of indications |
| B. | Must be performed in a darkened area with aid of a UV lamp |
| C. | Easily washed with water |
| D. | High visibility of indications |
| Answer» B. Must be performed in a darkened area with aid of a UV lamp | |
| 70. |
Which of the following developers is applied by brush, spraying or dipping? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» B. Water based wet | |
| 71. |
Which of the following developers is applied by spray only? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» A. Non-aqueous wet | |
| 72. |
Which of the following developers is applied by immersion or flow on only? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» B. Water based wet | |
| 73. |
What is the minimum time considered necessary for dark adaptation of the eyes prior to evaluating the results of a fluorescent penetrant test? |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» C. 5 minutes | |
| 74. |
What is the likely result of looking directly into a black light? |
| A. | Burning of the retina of the eye |
| B. | Temporary inflammation of the cornea |
| C. | Long term tendency toward formation of cataracts |
| D. | Fluorescence of the fluid in the eye |
| Answer» D. Fluorescence of the fluid in the eye | |
| 75. |
Which type of penetrant process would be best suited to the detection of wide, shallow discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 76. |
Which type of penetrant process affords most control of test sensitivity level? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 77. |
Which type of penetrant process is least susceptible to over washing? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 78. |
What is a disadvantage of the solvent removable penetrant process? |
| A. | It is the least sensitive of the penetrant processes |
| B. | It is not well suited for use on rough surfaces |
| C. | It is highly portable |
| D. | No water is required for its use |
| Answer» B. It is not well suited for use on rough surfaces | |
| 79. |
Which of the following is the proper first step in removal of excess penetrant when using the solvent removable penetrant process? |
| A. | Immerse the test piece in solvent |
| B. | Spray the test piece with water |
| C. | Wipe the test piece surface with clean, lint free towels slightly moistened |
| D. | All of the above is correct |
| Answer» C. Wipe the test piece surface with clean, lint free towels slightly moistened | |
| 80. |
Which of the following types of penetrants, developers, solvents are used when conducting a liquid penetrant test on a part that is exposed to a liquid oxygen environment. |
| A. | Water based penetrants |
| B. | Water based developers |
| C. | Water based solvents |
| D. | All of the above |
| Answer» A. Water based penetrants | |
| 81. |
The causes of non relevant indications are: |
| A. | Insufficient removal of excess surface penetrant |
| B. | Penetrant on operators hands |
| C. | Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces |
| D. | Contaminated work surfaces |
| Answer» C. Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces | |
| 82. |
Which of the following metals must be tested with low halogen sulphur free penetrant materials: |
| A. | Copper, silver, gold |
| B. | Nickel based alloys, certain stainless steel materials |
| C. | Steel, iron, aluminium |
| D. | Plastic, wood, paper |
| Answer» D. Plastic, wood, paper | |
| 83. |
Penetrant testing is limited by its inability to test which of the following materials: |
| A. | Aluminium |
| B. | Ceramics |
| C. | Porous materials |
| D. | Moulded rubber |
| Answer» D. Moulded rubber | |
| 84. |
Liquid penetrants can be further categorised by the removal method of excess surface penetrant: |
| A. | Water washable |
| B. | Solvent removable |
| C. | Post emulsified |
| D. | All of the above |
| Answer» A. Water washable | |
| 85. |
The typical temperature ranges for conducting a liquid penetrant test is: |
| A. | 60 to 100ºC |
| B. | 10 to 60ºF |
| C. | 16 to 52ºC |
| D. | 10 to 20ºK |
| Answer» B. 10 to 60ºF | |
| 86. |
Surface breaking porosity will show what type of relevant indications when a welded aluminium plate is tested with the liquid penetrant method: |
| A. | Linear indications |
| B. | Square indications |
| C. | Triangular indications |
| D. | Rounded indications |
| Answer» B. Square indications | |
| 87. |
Cracks, lack of penetration, lack of fusion which are surface breaking on a welded aluminium plate which has been liquid penetrant tested will show as: |
| A. | Linear indications |
| B. | Rounded indications |
| C. | Square indications |
| D. | Triangular indications |
| Answer» C. Square indications | |
| 88. |
Which of the following methods is not recommended for pre-cleaning prior to a liquid penetrant test: |
| A. | Steam cleaning, etching, rust and paint removal |
| B. | Solvent wipe, vapour degreasing, ultrasonic bath cleaning |
| C. | Blasting, grinding, filing, honing, machining |
| D. | All of the listed methods are not recommended |
| Answer» D. All of the listed methods are not recommended | |
| 89. |
The purpose of using a developer is: |
| A. | To create a contrasting background for the penetrants to ensure better visibility of indications |
| B. | Assists in reverse capillary action due to absorption ability of developers |
| C. | Prevent the part from corroding after the liquid penetrant test |
| D. | To ensure that the part has been correctly heat treated |
| Answer» B. Assists in reverse capillary action due to absorption ability of developers | |
| 90. |
The typical sequence of conducting a visible solvent removable penetrant is: |
| A. | Pre-clean with a solvent wipe method |
| B. | Apply visible penetrant, keep wet, dwell time of 2 minutes |
| C. | Pour solvent on surface of part and wipe with waste cloth |
| D. | Spray on a thick layer of developer |
| Answer» D. Spray on a thick layer of developer | |
| 91. |
The principle on which liquid penetrant testing is based on is: |
| A. | Capillary action of the penetrant |
| B. | Capillary action of cleaner/solvent |
| C. | Capillary action of developer |
| D. | None of the listed is correct |
| Answer» A. Capillary action of the penetrant | |
| 92. |
The limitation of a liquid penetrant test is: |
| A. | Only surface breaking discontinuities can be detected if chemically and physically clean and dry |
| B. | Porous materials cannot be tested |
| C. | There is cleaning problem following penetrant inspection in some cases |
| D. | All of the listed limitations are correct |
| Answer» B. Porous materials cannot be tested | |
| 93. |
Penetrants may be applied to the surface of part by : |
| A. | Spraying |
| B. | Dipping |
| C. | Pouring |
| D. | All of the above methods are acceptable |
| Answer» B. Dipping | |
| 94. |
Which of the following is a reason to post clean a part after a liquid penetrant test: |
| A. | The part might be further processed |
| B. | If repairs are necessary |
| C. | Developers absorb moisture and may result in part being corroded |
| D. | All of the reasons are correct |
| Answer» C. Developers absorb moisture and may result in part being corroded | |
| 95. |
Which of the following penetrant has a built-in emulsifier |
| A. | Water washable |
| B. | Solvent removable |
| C. | Post emulsified |
| D. | All of the listed above |
| Answer» A. Water washable | |
| 96. |
Liquid penetrants can be classified into the types of dyes they contain: |
| A. | Visible/colour contrast |
| B. | Fluorescent |
| C. | Dual sensitivity |
| D. | All of the listed is correct |
| Answer» D. All of the listed is correct | |
| 97. |
The advantages of using a visible solvent removable penetrant versus a post emulsified fluorescent penetrant is: |
| A. | No UV light is needed |
| B. | The technique is well suitable for site tests or spot checks |
| C. | No water or emulsifiers are needed |
| D. | No extra equipment is needed |
| Answer» D. No extra equipment is needed | |
| 98. |
The following precautions must be observed when removing the excess surface penetrant with a water wash method using a hose pipe: |
| A. | The wash angle should be at 45o |
| B. | A coarse droplet spray |
| C. | Temperature of water 16 to 43oC |
| D. | Pressure as low as possible not to exceed 50 psi |
| Answer» B. A coarse droplet spray | |
| 99. |
The typical causes for false indications are: |
| A. | Threads, keyways, splines, rough surfaces |
| B. | Sharp corners, pop rivets |
| C. | Insufficient removal of excess surface penetrant, penetrant on operators’ hands, using cloth/paper towels which are not lint free, dirty work surfaces |
| D. | Over washing with high pressure hose pipes |
| Answer» B. Sharp corners, pop rivets | |
| 100. |
Liquid penetrants can be further categorised by the removal method of excess surface penetrant: |
| A. | Water washable |
| B. | Solvent removable |
| C. | Post emulsified |
| D. | All of the above |
| Answer» D. All of the above | |
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