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AET-2006 Reading 5A

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  1. My Pre-Exam R eading on Acoustic Emission Testing Q&A 2016-05: For my ASNT Level III Examination on coming 2016 August. 15thJuly 2016 Fion Zhang/ Charlie Chong

  2. Acoustic Emission Testing Charlie Chong/ Fion Zhang

  3. Acoustic Emission Testing Charlie Chong/ Fion Zhang

  4. Acoustic Emission Testing Charlie Chong/ Fion Zhang

  5. Charlie Chong/ Fion Zhang

  6. Fion Zhang at Norway 7thJune 2016 Charlie Chong/ Fion Zhang

  7. SME- Subject Matter Expert http://cn.bing.com/videos/search?q=Walter+Lewin&FORM=HDRSC3 https://www.youtube.com/channel/UCiEHVhv0SBMpP75JbzJShqw Charlie Chong/ Fion Zhang

  8. http://www.yumpu.com/zh/browse/user/charliechong http://issuu.com/charlieccchong http://independent.academia.edu/CharlieChong1 Charlie Chong/ Fion Zhang

  9. Charlie Chong/ Fion Zhang http://greekhouseoffonts.com/

  10. Charlie Chong/ Fion Zhang

  11. The Magical Book of Tank Inspection ICP Charlie Chong/ Fion Zhang

  12. ASNT Certification Guide NDT Level III / PdM Level III AE - Acoustic Emission Testing Length: 4 hours Questions: 135 1 Principles and Theory • Characteristics of acoustic emission testing • Materials and deformation • Sources of acoustic emission • Wave propagation • Attenuation • Kaiser and Felicity effects, and Felicity ratio • Terminology (refer to acoustic emission glossary, ASTM 1316) Charlie Chong/ Fion Zhang

  13. 2 Equipment and Materials • Transducing processes • Sensors • Sensor attachments • Sensor utilization • Simulated acoustic emission sources • Cables • Signal conditioning • Signal detection • Signal processing • Source location • Advanced signal processing • Acoustic emission test systems • Accessory materials • Factors affecting test equipment selection Charlie Chong/ Fion Zhang

  14. 3 Techniques • Equipment calibration and set up for test • Establishing loading procedures • Precautions against noise • Special test procedures • Data displays 4 Interpretation and Evaluation • Data interpretation • Data evaluation • Reports 5 Procedures 6 Safety and Health 7 Applications • Laboratory studies (material- characterization) • Structural applications Charlie Chong/ Fion Zhang

  15. References & Catalog Numbers  NDT Handbook, Second Edition: Volume 5, Acoustic Emission Testing Catalog Number 130  Acoustic Emission: Techniques and Applications Catalog Number 752 Charlie Chong/ Fion Zhang

  16. 数字签名者:Fion Zhang DN:cn=Fion Zhang, o=Technical, ou=Academic, email=fion_zhang@ qq.com, c=CN 日期:2016.07.18 12:34:29 +08'00' Charlie Chong/ Fion Zhang

  17. 闭门练功 Charlie Chong/ Fion Zhang

  18. Acoustic Emission Testing Q&A BOOK -G 2ndED Charlie Chong/ Fion Zhang

  19. Acoustic Emission Testing Q&A BOOK -G 2ndED Charlie Chong/ Fion Zhang

  20. Level I Questions Acoustic Emission Testing Method Q1. Hold periods at high loads during fiberglass-reinforced pressure (FRP) vessel examinations using ASME Article 11 are necessary to: a. calculate the felicity ratio b. check for leaks c. monitor continuing damage d. measure the kaiser ratio A.90.16 Q2. In acoustic emission testing per ASME Section V, Article 11, sensor spacing on fiberglass-reinforced pressure (FRP) vessels is governed by: a . attenuation c. the test article temperature c. sensor diameter d. the type of couplant A.90.15 1c 2a 3c 4c 5d 6b 7b 8d Charlie Chong/ Fion Zhang

  21. Q3. How can an examiner be assured that proper contact has been made between the sensor and the vessel? a. apply extra couplant around the sensor b. use heavy-duty fasteners on sensors and cables c. measure the peak amplitude response from a simulated acoustic emission source d. use acoustic waveguides A.90.14-15 Q4. The source of the energy of the acoustic emission wave during crack growth is the: a. acoustic emission sensor b. surface energy of the new crack c. elastic stress field in the structure d . power supply from the mainframe to the preamplifier C.64 1c 2a 3c 4c 5d 6b 7b 8d Charlie Chong/ Fion Zhang

  22. Q4. The source of the energy of the acoustic emission wave during crack growth is the: a. acoustic emission sensor b. surface energy of the new crack c. elastic stress field in the structure d . power supply from the mainframe to the preamplifier C.64 1c 2a 3c 4c 5d 6b 7b 8d Charlie Chong/ Fion Zhang

  23. Q5. Which of the following can be a significant source of background noise? a. in-rushing fluid b. wind c. radio transmissions d. all of the above B.179 Q6. The elastic energy that is released by materials when they m;dergo deformation . is called: a. transformation b. acoustic emission c. brittle fracture d. isotrophy C.12; 0.32 1c 2a 3c 4c 5d 6b 7b 8d Charlie Chong/ Fion Zhang

  24. Q7. During loading, a metallic structure emits throughout the test period. When the load is reduced and then reapplied, no emissions are noted until the previous stress level was exceeded. This phenomenon is an example of: a. the dunegan corollary b. the kaiser effect c. the felicity ratio d. a hsu-nielsen source C.16; 0.37 Q8. The founder of modern acoustic emission technology was: a. Conrad Earl Krieder b. Professor Firestone c. james C. Bolling d. josef Kaiser C.17; 0.37 1c 2a 3c 4c 5d 6b 7b 8d Charlie Chong/ Fion Zhang

  25. Q9. The use of a couplant between the acoustic emission sensor arld the surface of the material being tested is to provide: a. protection for the sensor b. ground loop elimination c. a medium through which elastic stress waves can excite an acoustic emission sensor d. none of the above C.39; 0.53 Q10. During a pressure vessel test, there is a rapidly (exponentially) increasing count rate. There are several possible causes. The opefator's first priority is to examine the possibility that: a. the initial system calibration was invalid b. the vessel is undergoing local yielding due to high secondary stresses c. failure of the vessel is impending d. the level of background noise has increased 8.181 9c 10c 11b 12c 13c 14c 15b Charlie Chong/ Fion Zhang

  26. Q11. In order for an AE system to detect an active AE source in a material, the AE sensor must be placed: a. directly on the AE source b. anywhere in the general vicinity of the AE source c. as far from the AE source as possible d. at a standard distance from the AE source C.12 Q12. Which of the following is measured in meters per second (m/s)? a. the time required for a crack to grow b. the resonant frequency of a material c. the velocity of sound in a given material d. the rate of strain when a material is being deformed D.233 9c 10c 11b 12c 13c 14c 15b Charlie Chong/ Fion Zhang

  27. Q11. In order for an AE system to detect an active AE source in a material, the AE sensor must be placed: a. directly on the AE source b. anywhere in the general vicinity of the AE source c. as far from the AE source as possible d. at a standard distance from the AE source C.12 9c 10c 11b 12c 13c 14c 15b Charlie Chong/ Fion Zhang

  28. Q13. One of the major differences in the acoustic emission NDT method compared to most other NDT methods is that: a. acoustic emission relies on visual interpretation of data b. computers are used exclusively for analysis c. acoustic emission directly detects the growth of flaws d. transducers are used to gather data C.12 14. The signal amplitude (in decibels) is given as: A = 20 log10 (V/V0)- Gp Where: V Vo Gp = Signal Amplitude at the preamp output, in microvolts = Reference Voltage= 1.0 μV = Preamplifier Gain = 40 dB What is the signal amplitude (in decibels) of an AE signal captured at the preamplifier output on an oscilloscope and measuring 1.0 V? a. 55 dB b. 60 dB c. 80 dB d. 120 dB D.26 9c 10c 11b 12c 13c 14c 15b Charlie Chong/ Fion Zhang

  29. Q15. One microvolt is the same as: a. 0.001 V b. 0.000001 V c. 10mV d. 0.1mV D.27 9c 10c 11b 12c 13c 14c 15b Charlie Chong/ Fion Zhang

  30. Q16. Raising the detection threshold (or lowering the gain) to reduce background noise is not desired because it can lead to: a. reduced genuine emissions b. changes in the value of the AE signal features c. fewer locatable AE events due to fewer hits being detected d. all of the above 0.41 Q17. The active element inside an AE sensor that senses surface displacements is usually: a. a capacitor b. a piezoelectric crystal c. a strain gauge d. an inductive coil 0.51 16d 17b 18c 19a 20c 21c 22d 23d Charlie Chong/ Fion Zhang

  31. Q18. When should a waveguide be used in place of an adhesive for coupling an AE transducer to a text object? a. when access to the surface of the test object is limited b. when surface temperatures start to reduce the coupling properties and bond strength of the adhesive c. both a and b d. none of the above 0.53 Q19. AE sensors may be mounted directly to painted surfaces if: a. the paint is smooth, not too thick and well bonded to the vessel surface b. the paint is oil based c. the paint is not lead based d. the paint has been adequately cured 0.271 16d 17b 18c 19a 20c 21c 22d 23d Charlie Chong/ Fion Zhang

  32. Q20. The most common way of attaching AE sensors to carbon steel vessels that operate at low to medium temperatures is: a. with hot glue b. with duct tape and wax c. silicon based vacuum grease and magnetic hold downs d. permanent stick epoxy glue 0.271 Q21. The most common artificial source of AE used to verify sensor coupling is: a. a spring loaded center punch b. a handful of small rocks thrown at the vessel wall c. 0.3 mm, 2H mechanical pencil lead breaks d. 0. 7 mm, 2H mechanical pencil lead breaks 0.273 16d 17b 18c 19a 20c 21c 22d 23d Charlie Chong/ Fion Zhang

  33. Q22. ASTM E 1139-02 applies to metal pressure boundaries in industrial systems such as: a. pressure vessels b. piping c. other system components which serve to contain system pressure d. all of the above L.Para. 1.1 Q23. What information should be recorded about background noise during a test? a. the magnitude of background noise at periodic intervals during the test, as the test circumstances allow b. the times of any specific noise incidents c. the effects of noise on the examination d. all of the above L.Para. 5.4.2.2 16d 17b 18c 19a 20c 21c 22d 23d Charlie Chong/ Fion Zhang

  34. Q24. Which of the following is recommended for monitoring and recording of the applied load in an AE test? a. the applied load should be monitored and recorded to the extent necessary to allow correlation to the AE data b. the applied load should be monitored so that it reaches a sufficient load level and may be recorded independently of the AE signal c. the applied load may be checked at intervals during testing. If at any of these intervals the load level is sufficiently above a pretest specified target, that will be sufficient. d. an AE event must be recorded each time an applied load data is sampled and recorded N.Para. 1.1 and 5.4.2.3 24a Charlie Chong/ Fion Zhang

  35. ASTM E569 ASTM E650 ASTM E976 ASTM E1139-02 Charlie Chong/ Fion Zhang

  36. Level II Questions Acoustic Emission Testing Q1. If a crack is detected by AE during a pressure test, how can its existence be verified using AE? a. repeat the same loading b. monitor during a load hold at 50% of the maximum test pressure c. load to a pressure slightly higher then the previous maximum test load d. monitor during a load at 25% of the maximum text pressure O.Chap.1/Part2 Q2. If rain starts falling on an uninsulated vessel during an AE test and produces significant background noise, the AE test operator should: a. speed up the test b. pause the test until the rain lets up nough or stops c. conclude the test and call the current load, 100% maximum test load d. continue the test and perform filtering of the background during the analysis 0.13-14 1c 2b 3c 4c 5c 6a 7c Charlie Chong/ Fion Zhang

  37. Q3. AE generated during proof testing, when the load is between the service load and he maximum proof load, is indicative of the damage experienced during the preceding working period. This is the basic idea put forth through: a. the kaiser effect b. the felicity effect c. the dunegan corollary d. rahman scattering theory 0.37 Q4. Attenuation in metals is due primarily to: a. geometric beam spreading b. material damping c. a and b d. beam refraction O.Chap.2/Part7 1c 2b 3c 4c 5c 6a 7c Charlie Chong/ Fion Zhang

  38. Q5. AE produced by a liquid leaking through a valve is due primarily to: a. turbulence b. cavitation c. a and b d. none of the above 0.182 Q6. An additional source of background noise that is sometimes detected during AE testing of inservice metal storage tanks is: a. active corrosion b. overhead power lines c. highway traffic d. railroad traffic 0.221 1c 2b 3c 4c 5c 6a 7c Charlie Chong/ Fion Zhang

  39. Q7. What is the main difference in testing spheres as compared to bullets and drums? a. the size and shape b. the liquid loading experienced by the sphere c. a and b d. spheres require minimal sensor placement 0.270 1c 2b 3c 4c 5c 6a 7c Charlie Chong/ Fion Zhang

  40. Q7. What is the main difference in testing spheres as compared to bullets and drums? a. the size and shape b. the liquid loading experienced by the sphere c. a and b d. spheres require minimal sensor placement 0.270 1c 2b 3c 4c 5c 6a 7c Charlie Chong/ Fion Zhang

  41. Sphere Tanks The principles for testing spheres are applicable to many other pressure vessels such as drums, bullet tanks, reactors and absorbers. The main difference other than the shape and size is that the liquid loading is much greater for a sphere than for vessels like drums and bullets. Charlie Chong/ Fion Zhang

  42. Sphere Tanks The principles for testing spheres are applicable to many other pressure vessels such as drums, bullet tanks, reactors and absorbers. The main difference other than the shape and size is that the liquid loading is much greater for a sphere than for vessels like drums and bullets. Charlie Chong/ Fion Zhang

  43. Bullet Tanks Charlie Chong/ Fion Zhang

  44. Q8. AE testing of inservice vessels is aimed primarily at detecting service related cracking. This cracking may be a result of: a. stress corrosion cracking (SCC) b. sulfide stress cracking (SSC) c. fatigue cracking d. all of the above 0.270 Q9. Size, shape and orientation of defects detected by AE testing, is usually determined by: a. size is estimated by the number of ringdown counts b. orientation can be assumed to be normal to the hoop direction c. shape can always be assumed to be like a "half penny" d. follow-up nondestructive testing 0.270 8d 9d 10b 11d 12b 13c 14d 15c Charlie Chong/ Fion Zhang

  45. Q10. When testing inservice pressure vessels, the maximum test load is commonly based on the maximum operating pressure experienced: a. in the last one or two months of operation b. in the last six or 12 months of operation c. in the last 10 years of operation d. over the life of the vessel 0.274 Q11. Why is it wise to start an AE test for an inservice pressure vessel at a load lower then required? a. to determine that the loading rate is sufficient b. to verify that the AE instrument is operating satisfactorily c. the maximum operating pressure may be uncertain and AE from SCC occurs within a few percent of this value d. all of the above 0.271 8d 9d 10b 11d 12b 13c 14d 15c Charlie Chong/ Fion Zhang

  46. Q12. During continuous monitoring of pressure boundaries, AE sources are stimulated by: a. special cyclic loading b. normal system operating conditions c. over pressurization d. all of the above L.Para. 5.1 Q13. During continuous monitoring of pressure boundaries per ASTM E 1139,AE system operation and data interpretation should be verified by a qualified AE specialist: a. once a month b. once a year c. every six months d. only when there are signs of the system malfunctioning L.Para. 7.7 8d 9d 10b 11d 12b 13c 14d 15c Charlie Chong/ Fion Zhang

  47. Q11. Why is it wise to start an AE test for an inservice pressure vessel at a load lower then required? a. to determine that the loading rate is sufficient b. to verify that the AE instrument is operating satisfactorily c. the maximum operating pressure may be uncertain and AE from SCC occurs within a few percent of this value d. all of the above 0.271 8d 9d 10b 11d 12b 13c 14d 15c Charlie Chong/ Fion Zhang

  48. Q12. During continuous monitoring of pressure boundaries, AE sources are stimulated by: a. special cyclic loading b. normal system operating conditions c. over pressurization d. all of the above L.Para. 5.1 Q13. During continuous monitoring of pressure boundaries per ASTM E 1139,AE system operation and data interpretation should be verified by a qualified AE specialist: a. once a month b. once a year c. every six months d. only when there are signs of the system malfunctioning L.Para. 7.7 8d 9d 10b 11d 12b 13c 14d 15c Charlie Chong/ Fion Zhang

  49. Q14. During continuous monitoring of pressure boundaries per ASTM E 1139, a 0.3 mrn, 2H pencil lead break at a distance of 300 mm (12 in.) should produce a signal to noise ratio of: a. 1 to 1 b. 2 to 1 c. 3 to 1 d. 4 to 1 L.Para. 8.1.2 Q15. During continuous monitoring of pressure boundaries, signal detection sensitivity should be evaluated during normal operation: a. by using a spring loaded center punch b. by tapping the pressure boundary with a light hammer c. by using pencil lead breaks as a signal source d. by using a 7 mm pencil lead break 3.05 m (10ft) from the sensor L.Para. 8.1.2 8d 9d 10b 11d 12b 13c 14d 15c Charlie Chong/ Fion Zhang

  50. Q16. During continuous monitoring of pressure boundaries, the distance at which an AE source can be detected is maximized by using a recommended low monitoring frequency of: a. 10kHz to 20kHz b. 20 kHz to 60kHz c. 50 kHz to 100 kHz d. 200 kHz to 400 kHz L.Para. 8.1.4 Q17. During continuous monitoring of pressure boundaries, an AE system can perform leak detection if: a. it can measure the average signal level and/or AE rms voltage at each channel b. it can measure ring.down counts c. it can measure hit rate d. it can measure signal duration above 500KHz L.Para. 12.1.2; Para. 8.1. 7.2 16c 17a 18d 19c 20b 21c 22b Charlie Chong/ Fion Zhang