McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
A common application of an aluminium block containing quench cracks is to: |
| A. | Determine penetrant test sensitivity |
| B. | Compare performance of penetrant materials or processes |
| C. | Determine effects of mechanical cleaning methods on penetrant test results |
| D. | Determine effectiveness of cleaning techniques |
| Answer» A. Determine penetrant test sensitivity | |
| 2. |
Which of the following is not (!) an advantage of a water washable fluorescent penetrant process? |
| A. | Excess penetrant is easily removed with a water wash |
| B. | It is well suited to testing large quantities of small parts |
| C. | It is readily removed from shallow discontinuities |
| D. | It has low cost, low processing time compared to the post emulsified penetrant process |
| Answer» C. It is readily removed from shallow discontinuities | |
| 3. |
When using a water washable penetrant testing process, why should the water rinse temperature remain constant? |
| A. | To avoid changes in rinse efficiency |
| B. | To maintain the temperature of the part |
| C. | To avoid over washing |
| D. | To avoid under washing |
| Answer» C. To avoid over washing | |
| 4. |
What is the proper technique for removal of excess penetrant from a part when using a water washable penetrant process? |
| A. | Fine spray normal to the surface |
| B. | Coarse spray normal to the surface |
| C. | Fine spray at 45 degrees to the surface |
| D. | Coarse spray at 45 degrees to the surface |
| Answer» D. Coarse spray at 45 degrees to the surface | |
| 5. |
Which type of developer would you use to obtain the highest sensitivity test results? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Aqueous wet |
| D. | Lipophilic |
| Answer» B. Non-aqueous wet | |
| 6. |
What type of penetrant process would be best suited to an application at near freezing temperatures? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | None of the above |
| Answer» D. None of the above | |
| 7. |
Which type of developer does not (!) provide a contrasting background against which to view penetrant indications? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water soluble |
| D. | Water suspendable |
| Answer» A. Dry | |
| 8. |
Which type of developer should not be used with a visible dye penetrant process? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water soluble |
| D. | Water suspendable |
| Answer» A. Dry | |
| 9. |
Why might steel parts have a greater tendency towards rusting after penetrant testing? |
| A. | Penetrant materials are normally corrosive |
| B. | Penetrant materials residues are hydroscopic |
| C. | Any protective oils are removed during penetrant testing |
| D. | This is true only if the developer and penetrant residues are not removed after testing |
| Answer» C. Any protective oils are removed during penetrant testing | |
| 10. |
The most significant advantage of the visible solvent removable penetrant process is? |
| A. | Its suitability for penetrant testing of article with rough surfaces |
| B. | Portability |
| C. | Its non-corrosive properties |
| D. | Ability to allow retest |
| Answer» B. Portability | |
| 11. |
Which penetrant test processes commonly use the same penetrants? |
| A. | Water washable |
| B. | Water washable and solvent removable |
| C. | Solvent removable and post emulsifier |
| D. | None of the above |
| Answer» C. Solvent removable and post emulsifier | |
| 12. |
Mercury vapour black lights may be extinguished if the supply voltage drops below about: |
| A. | 120 volts |
| B. | 90 volts |
| C. | 220 volts |
| D. | 200 volts |
| Answer» D. 200 volts | |
| 13. |
The output of a mercury vapour black light depends on: |
| A. | Cleanliness of its filter |
| B. | Age of the bulb |
| C. | Both a and b |
| D. | None of the above |
| Answer» C. Both a and b | |
| 14. |
When a mercury vapour black light is first turned on, what minimum warm-up time is normally required? |
| A. | None |
| B. | 2 to 3 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» C. 5 minutes | |
| 15. |
When a mercury vapour black light is inadvertently cut off, approximately how long should it be allowed to cool before attempting to restart? |
| A. | Not required |
| B. | 2 to 3 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» C. 5 minutes | |
| 16. |
A soft aluminium test piece is to be penetrant tested. The piece has previously been sand blasted to remove tightly adhering soils. What additional surface preparation should be performed? |
| A. | Etching |
| B. | Solvent cleaning |
| C. | Ultrasonic cleaning |
| D. | Grinding |
| Answer» C. Ultrasonic cleaning | |
| 17. |
Dried, non-aqueous developers are best removed after penetrant testing by: |
| A. | Solvent cleaning |
| B. | Wiping with a water dampened cloth |
| C. | Wiping with a dry towel |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 18. |
The most important penetrant test processing time to control is: |
| A. | Penetrant dwell time |
| B. | Emulsifier dwell time |
| C. | Water rinse time |
| D. | Development time |
| Answer» A. Penetrant dwell time | |
| 19. |
A penetrant which contains an emulsifier is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Solvent suspended |
| Answer» B. Water washable | |
| 20. |
A penetrant which requires a separate emulsification step prior to removal from the surface of the test piece is called? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Solvent suspended |
| Answer» C. Post emulsifiable | |
| 21. |
The chief advantage of using a water washable penetrant process is: |
| A. | Sensitivity |
| B. | Safety |
| C. | Water tolerance |
| D. | Economics |
| Answer» B. Safety | |
| 22. |
While performing a fluorescent water washable penetrant test, which of the following steps should be performed under black light? |
| A. | Penetrant application |
| B. | Excess penetrant removal |
| C. | Emulsification |
| D. | Developer application |
| Answer» B. Excess penetrant removal | |
| 23. |
What are the two most important properties in determining the penetrating ability of a penetrant? |
| A. | Viscosity and surface tension |
| B. | Viscosity and contact angle |
| C. | Surface tension and wetting ability |
| D. | None of the above |
| Answer» C. Surface tension and wetting ability | |
| 24. |
The human eye is most sensitive to which of the following types of light? |
| A. | Yellow-green |
| B. | Red |
| C. | Blue-violet |
| D. | Orange |
| Answer» C. Blue-violet | |
| 25. |
What amount of time is normally considered necessary for dark adaption of the eyes prior to performing a fluorescent penetrant test? |
| A. | None required |
| B. | 1 to 2 minutes |
| C. | 3 to 5 minutes |
| D. | 5 to 10 minutes |
| Answer» C. 3 to 5 minutes | |
| 26. |
Which of the following is not normally recommended? |
| A. | Performing a fluorescent penetrant test following a visible penetrant test? |
| B. | Performing a visible penetrant test following a fluorescent test |
| C. | Removing excess penetrant with a water spray |
| D. | Removing excess penetrant with towels moistened with solvent |
| Answer» A. Performing a fluorescent penetrant test following a visible penetrant test? | |
| 27. |
What is the most common source of penetrant bath contamination? |
| A. | Emulsifier |
| B. | Water |
| C. | Developer |
| D. | Solvent |
| Answer» B. Water | |
| 28. |
Which of the following is normally considered acceptable practice? |
| A. | Sand blasting a soft aluminium part during pre-cleaning |
| B. | Performing a fluorescent penetrant test following a visible penetrant test |
| C. | performing a re-test on a part tested with a water washable penetrant process |
| D. | Removing excess penetrant with a water spray |
| Answer» D. Removing excess penetrant with a water spray | |
| 29. |
A penetrant testing method in which an emulsifier, separate from the penetrant, is used is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifying |
| D. | Self emulsifying |
| Answer» C. Post emulsifying | |
| 30. |
A penetrant testing method in which the degree of washability can be controlled by the operator is called: |
| A. | Self emulsifying |
| B. | Post emulsifiable |
| C. | Water washable |
| D. | Solvent removable |
| Answer» C. Water washable | |
| 31. |
Open, shallow discontinuities are best detected by which penetrant testing method? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | None of the above |
| Answer» C. Post emulsifiable | |
| 32. |
An advantage of the post emulsifiable penetrant testing process is that: |
| A. | Test pieces can be re-processed several times with little loss of sensitivity |
| B. | It is the most economical penetrant testing process |
| C. | It is highly susceptible to over washing |
| D. | It is not self emulsifying |
| Answer» A. Test pieces can be re-processed several times with little loss of sensitivity | |
| 33. |
A disadvantage of the post emulsifiable penetrant process is that: |
| A. | Test pieces can be re-processed several times with little loss of sensitivity |
| B. | It is not very sensitive to open, shallow discontinuities |
| C. | It is less sensitive to degradation in the presence of acids and chromates |
| D. | Emulsifier application is an extra processing step |
| Answer» D. Emulsifier application is an extra processing step | |
| 34. |
Acceptable methods to apply emulsifier are: |
| A. | Dipping |
| B. | Flowing |
| C. | Spraying |
| D. | All of the above |
| Answer» D. All of the above | |
| 35. |
An advantage of emulsifier application by dipping is: |
| A. | Excess penetrant is recovered in the emulsifier tank and reprocessed |
| B. | All of the test object is coated at approximately the same time |
| C. | Excess emulsifier drains back into the emulsifier tank for re-use |
| D. | Hydrophilic scrubbing is then easier to perform |
| Answer» B. All of the test object is coated at approximately the same time | |
| 36. |
Emulsification time is less critical for the detection of: |
| A. | Fine, tight cracks |
| B. | Wide, shallow discontinuities |
| C. | Internal porosity |
| D. | None of the above |
| Answer» A. Fine, tight cracks | |
| 37. |
Over washing during excess penetrant removal is less likely with which penetrant testing process? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Self emuslifying |
| Answer» B. Water washable | |
| 38. |
The fluorescent dyes used in the liquid penetrant testing process are most active when energised with black light of what wavelengths? (Å stands for angstrom units) |
| A. | 2.0 × 10-7m (2000Å) |
| B. | 2.5 × 10-7m (2500 Å) |
| C. | 3.25 × 10-7m (3250Å) |
| D. | 3.65 × 10-7m (3650 Å) |
| Answer» D. 3.65 × 10-7m (3650 Å) | |
| 39. |
Application of penetrant to a test piece may be by: |
| A. | Dipping, brushing or spraying |
| B. | Spraying only |
| C. | Bushing or spraying only |
| D. | Dipping or spraying only |
| Answer» A. Dipping, brushing or spraying | |
| 40. |
The penetrant process best suited to use on parts with rough surfaces is: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Magnetic particle |
| Answer» B. Water washable | |
| 41. |
The penetrant process best suited for the detection of very fine discontinuities is: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Magnetic particle |
| Answer» C. Post emulsifiable | |
| 42. |
The penetrant process best suited for use on parts with keyways and threads is: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | None of the above |
| Answer» B. Water washable | |
| 43. |
Indications which are caused by design or construction of the test piece are called? |
| A. | Relevant |
| B. | Non-relevant |
| C. | False |
| D. | Real |
| Answer» B. Non-relevant | |
| 44. |
Indications which are caused by something other than a discontinuity are called: |
| A. | Relevant |
| B. | Non-relevant |
| C. | False |
| D. | Real |
| Answer» B. Non-relevant | |
| 45. |
Which of the following discontinuities would you not expect to find in a casting? |
| A. | Shrinkage cracks |
| B. | Incomplete penetration |
| C. | Cold shuts |
| D. | Porosity |
| Answer» C. Cold shuts | |
| 46. |
Which type of casting is made in a metal mould? |
| A. | Investment casting |
| B. | Sand casting |
| C. | Die casting |
| D. | Lost wax process |
| Answer» C. Die casting | |
| 47. |
The act of determining the cause of an indication is called |
| A. | Interpretation |
| B. | Inspection |
| C. | Evaluation |
| D. | Determination |
| Answer» A. Interpretation | |
| 48. |
The act of determining the effect of a discontinuity of the usefulness of a part is called: |
| A. | Interpretation |
| B. | Inspection |
| C. | Evaluation |
| D. | Determination |
| Answer» C. Evaluation | |
| 49. |
Contaminants which are commonly limited in penetrant materials are: |
| A. | Hydrogen and chlorine |
| B. | Carbon and sulphur |
| C. | Hydrogen and carbon |
| D. | Chlorine and sulphur |
| Answer» D. Chlorine and sulphur | |
| 50. |
The most likely result of a too short dwell time of an emulsifier is: |
| A. | A tendency to remove the penetrant from fine discontinuities |
| B. | Incomplete removal of excess surface penetrant |
| C. | An overactive emulsifier |
| D. | All of the above |
| Answer» B. Incomplete removal of excess surface penetrant | |
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