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NDT Question and Answer SUNDAY, 5 JUNE 2011
Basic knowledge of Non-Destructive Testing (NDT) and Destructive Testing (DT) 1. W hat is Non-Destruc Non-Destructive tive Testing (NDT)? NDT is the testing of materials to detect internal and surface defects or discontinuities using methods which do not damage or destroy the material under test
2. What is the different between Defects or discontinuities? Discontinuities: A Discontinuities: Any ny imperfectio imperfection n or inte interrupti rruption on in in the the normal normal physical physical structure structure or configuration of a product (cracks, laps, inclusion, etc). Discontinuity may or may not affect the usefulness of the product Defect:: A disc Defect discontinuity ontinuity whose size, s ize, shape, orientation, orientation, location or properties properties makes it detrimental to the useful service of the product in which it occurs or exceeds the accept/reject criteria for the given design. Defect is a type of discontinuity.
3. What are the major 5 NDT methods? The major 5 NDT Methods are: a. Ultrasonic Testing b. Radiography Testing c. Magnetic Particle Testing d. Dye Penetrant Testing e. Eddy Current Testing FOLLOWERS
4. For detection of surface surface weld weld defects or discontinuities what are the NDT methods commonly used?
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The NDT methods are commonly used to detect the defect/discontinuities on surface weld: a. Visual Testing (VT) b. Penetrant Testing (PT) c. Ma Magnetic gnetic Particle Partic le Testing (MT) d. Eddy Current Testing (ET) 5. For detection of internal weld internal weld defects or discontinuities, material what are the NDT methods commonly used? The NDT methods to detect internal weld defect/discontinuities: a. Radiographic Testing (RT) ndt- sampleq uestions.bl og spot.i n
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1/11
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NDT Questi on and Answer
b. Ultrasonic Testing (UT)
▼ 2011 2011 (6) (6) ▼ June June (4) (4)
6. What are the factors affecting the choice of NDT method Depends on many factors and conditions a. Cost b. Type of defect sought c. Type of material to be tested d. Position and location of defect e. Av Avail ailabil ability ity of equip equipment ment f. Av Availa ailabil bility ity of qual qualifie ified d operato operators rs g. Working conditions and location h. Sensitivity required i. others
Basic knowledge knowledge of NonDestructive Testing (NDT) a... Eddy Current Testing Level I (20 Questions Questions)) Asnt PT Level 1 sample question. Asnt MT MT Level 1 - set 1 ► May May (2) (2)
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7. What is Destructive Testing (DT)? Destructive Testing is the testing of materials to detect internal and surface defects or discontinuities by methods which damaging or destroying the material under test
8. What are the DT (Destructive Testing) methods widely applied? The DT methods widely used are as follows: a. Tensile Test b. Bend Test c. Charpy Test d. Vicker Test e. Fracture Test f. Fatigue Test g. Creep Test h. Replica Posted by Wann at 07:03
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Labels: knowledge of DT and NDT
ndt- sampleq uestions.bl og spot.i n
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NDT Questi on and Answer
THURSDAY, 2 JUNE 2011
Eddy Current Testing Level I (20 Questions) Q.1
Generation of eddy currents depends on the principle principle of:
A. wave guide theory. B. electromagnetic induction. C. magneto-r estrictive forces. D. a ll of the above. Q.2
A secondary field is gener generated ated by the test object and is:
A. equal and an d opposite to the primary field. B. opposite to the primary field, but much smaller. C. in the same plane as the coil is wound. wound. D. in phase with with the primary field. Q.3
When a non-fe non-ferromagnetic rromagnetic part is placed in the test coil, the coil's voltage:
A. increases. B. remains constant because this is essential. C. decreases. D. shifts sh ifts 90 degrees degree s in in phase. Q.4
Eddy curren currents ts gener generated ated in a test object flow:
A. in the same plane as magnetic flux. B. in the same plane as the coil is wound. wound. C. 90 degrees degre es to the coil winding winding plane. D. Eddy curre nts have no predictable direction. Q.5
The discovery discovery of electromagnetic induction is credited to:
A. Arago. B. Oersted. C. Maxwell. D. Faraday. Q.6
A standard depth of penetration is defined as the point in a test object where where
the relative eddy current density is reduced to: A. 25 percen t. B. 37 percent. C. 50 percent. D. 100 percent. Q.7
Calculate the standard depth of penetration at 10 kH kHz z in copper; σ = 5.7 • 10 7
mhos per meter. A. 0.1 mm B. 0.02 mm C. 0.66 mm D. 66 mm
Q.8 Differential coils are usually used in: A.. bob A bobbin bin coils. B. probe coils . C. OD coils. D. any of the above.
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Q.9 When using a probe coil to sc scan an a test object,______ object,______ A.. the obj A object ect must be dry and and poli polished. shed. B. the object must be sc anned carefully to insure inspection coverage. C. the object object must mus t be sc scanned anned in circular motions at constant speeds. D. the probe must be moving at all times times to get a reading. reading. Q.10 A "spinning probe" would most likely likely be a (an): (an): A.. bob A bobbin bin coil. B. ID coil. C. OD coil. D. probe coil. Q.11
A "feed-thr ough" coil is:
A. a coil with with primary/secondar y windings windings conne cted so that the signal is fed through the prim primary ary to the secondary. B. an encircling en circling coil. C. an OD coil. D. both B and C. Q.12 When inspecting a tubular product with an encircling coil, which statement is not true? A. OD discontinuities can be foun d. B. Axial discontinuity locations can be note d. C. Circumferential discontinuity locations can be noted. D. ID discontinuities can be found. Q.13 An absolute coil measurement is made A.. by comparing A comparing one o ne spot on the test object to a nother nother.. B. without reference to or direct comparison with a standard. C. only with pro be coils. co ils. D. by comparative measurement to a known standard. Q.14 When coils in a differential arrangement are affected simultaneously with the same test object variables, the output signal A. is directly propor tional to the n umber of variable s. B. is "0" or near-"0." C. is indirectly proportional to the number of variables. D. is primarily a function of the exciting current. Q.15Which coil type inherently has better thermal stability? A. Bobbin B. Absolute Absolut e C. OD D. Differentia Differentia l Q.16 A hybrid coil is composed composed of two or more more coils. The coils A. must be aligned coplanar to the dr iver axis. B. may be of widely different dimensions. C. must be impedance-matched as closely as possible. D. are very temperature sensitive. Q.17 Proper selection of test coil arrangement is determined by: A. shape of test obje ct. B. resolution required. ndt- sampleq uestions.bl og spot.i n
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C. sensitivity requir ed. D. all of the above.
Q.18 A coil's resistance resis tance is determined by: A.. wire material A material.. B. wire length. C. wire cross-sectional area. D. all of the above. Q.19 In Inductance ductance is analogous analogous to: A.. force. A B. volume. C. inertia. D. velocity. Q.20 The unit unit of inductance is the: A. hen henry. ry. B. maxwell. C. ohm. D. farad.
ANSWER ANSWER
1.B
2.B
3.C
4.B
5.D
6.B
7.C
8.D
9.B
10.D
11.D
12.C
13.B
14.B
15.D
16.B
17.D
18.D
19.C
20.A
Posted by Wann at 04:17
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WEDNESDAY, 1 JUNE 2011
Asnt As nt PT Level 1 sample sample question.
Liquid Penetrant Testing Method (40 Questions)
1. Which W hich one of the following conditions will affec t the rate and the extent a liquid penetrant will enter cracks, fissures, and other small openings? a. the hardness of the specimen being tested b. the surface condition of the specimen being tested c. the color of the penetrant d. the conductivity of the specimen being tested 2. Which of the following is a commonly used classification for penetrant? a. post-emulsifiable post-em ulsifiable penetrant penetrant b. nonferrous penetrant c. chemical etch penetrant d. nonaqueous penetrant ndt- sampleq uestions.bl og spot.i n
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3. A generally accepted method for removing excess nonwater-washable penetrant is: a. repeatedly dipping dipping the test specimen spec imen in a c leaner b. soaking the test specimen in hot detergent water c. blowing the excess penetrant off the surface of the part with compressed air d. wiping and cautiously cleaning the test specimen with a cleaner-dampened cloth 4. All of the following parts can be tes ted by the liquid penetrant penetrant method except: a. an iron casting b. an aluminum forging c. a part made from a porous plastic material d. a part made from a non-porous material 5. Whic Which h of the following following discontinuities can be found by the penetrant test method? a. a surface crack b. a subsurface crack c. an internal inclusion d. none of the above 6. Whic Which h of the following following is generally generally the the more acceptable method for cleaning parts prior to penetrant penetrant testing? a. sand blasting b. wire brushing c. grinding d. vapor degreasing 7. All of the following methods are commonly used to clean parts prior to penetrant testing except: a. vapor degreasing b. liquid solvent c. power wire brushing d. alkaline cleaner 8. Cutting oils m ay be effectively removed from parts before penetrant penetrant testing by: a. pre-heating b. vapor degreasing c. washing with water d. all of the above 9. The most com mon type of contaminant in fluorescent penetrant penetrant fluid is: a. metal filings b. oil c. detergents (from cleaning) d. water 10. Black light, with a proper functioning filter in place, used for fluorescent penetrant inspection can cause permanent damage to: a. human tissues b. human eyes c. human blood cells d. none of the above ndt- sampleq uestions.bl og spot.i n
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11. All of the following basic inspection principles apply to the penetrant methods excepta. the penetrant must enter the discontinuity in order to form an indication b. indications glow w hen illuminated with a black light c. a longer penetration time is required for smaller discontinuities d. if the penetrant is washed out of the discontinuity, an indication will not be formed by that discontinuity 12. Subsurface discontinuities can be best detected by: a. the post-emulsification penetrant method b. the visible dye penetrant method c. the fluorescent, water-washable penetrant method d. none of the above 13. Visible penetrant may be applied by: a. brushing b. spraying c. dipping d. none of the above 14. The first step in conducting a liquid penetrant test on a surface that has been painted is to : a. carefully c arefully apply apply the penetrant over the surface surfac e b. completely com pletely remove the paint c. thoroughly wash the surface with a detergent d. wire brush the surface to roughen the smooth surface coating of paint 15. When using a post-emulsification penetrant, it is necessary to apply the emulsifier: a. before applying the penetrant b. after the water wash operation c. after the dwell time has elapsed d. after the develonment time has elapsed 16. When conducting a water-washable liquid penetrant test, the wet developer is applied: a. immediately im mediately after the penetrant has been applied b. immediately im mediately before the penetrant is applied c. after removal of the penetrant d. after removal of the emulsifier 17. The term used to describe the action of a particular developer in soaking up the penetrant in a discontinuity, so as to cause the maximum bleed-out of the liquid penetrant for increased contrast and sensitivity, is known as: a. blotting b. capillary action c. concentration d. attraction 18. Using a black light lamp with a cracked filter or without the filter in place can cause damage to human eyes because the lamp emits: a. black light b. ultraviolet light ndt- sampleq uestions.bl og spot.i n
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c. infrared light d. none of the above 19. The term used to define the period of time in which the test part is covered with penetrant is: a. waiting time b. soak time (drain time) c. penetration time (dwell time) d. bleed-in time 20. Usually, the most desirable method of removing excess water-washable penetrant after the dwell time is by using: a. a low pressure coarse water spray b. water and brush c. a solid stream of water d. water and clean rags 21. When conducting a liquid penetrant test using a post emulsifiable visible dye penetrant, the generally generally accepted acc epted method for applying the wet developer is by: a. brushing b. swabbing c. dipping d. spraying 22. Which of the following characteristics does not apply to liquid penetrant testing? a. this method can accurately measure the depth of a crack or discontinuity b. this method can be used for on-site testing of large parts c. this method can be used to find shallow surface discontinuities d. this method can be made more or less sensitive by using different penetrant materials 23. Which of the following discontinuities is most likely to be missed due to improper rinse techniques? a. a forging lap b. deep pitting c. shallow and broad discontinuities d. the rinse tec hnique will not affect the detection of disc ontinuiti ontinuities es 24. When conducting a fluorescent penetrant test, a commonly used technique for assuring that the excess penetrant has been removed prior to the application of a developer developer is to: a. blow compressed air over the surface b. chemically etch the surface c. blot the surface with absorbent paper d. scan the surface with a black light 25. Which of the following surface conditions could have a detrimental effect on a liquid penetrant penetrant test? tes t? a. a wet surface b. a rough weld c. an oily surface d. all of the above
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NDT Questi on and Answer
26. Liquid penetrant penetrant testing is c apable of detecting: a. intergranular stress corrosion cracking discontinuities b. discontinuities open to the surface c. subsurface discontinuities d. all of the above 27. Black light equipment is required r equired when penetrant penetrant testing by: a. the.fluorescent penetrant method b. the visible dye penetrant method c. the non-fluorescent penetrant method d. all of the above 28. The term used to define the tendency of certain liquids to penetrate into small opening open ings s such s uch as cracks or fissures is: a. saturation b. capillary action c. blotting d. wetting agent 29. Excess penetrant (all penetrant except that which is in discontinuities) is removed from the specimen: a. after the required penetrant dwell time has elapsed b. before the application of an emulsifier if a post-emulsifier penetrant is used c. by means of a steam cleaner d. only when water-washable penetrants are used 30. When using a post-emulsifiable penetrant, the emulsifier time should be: a. as long as the penetrant dwell time b. half the penetrant dwell time c. the same as the developer time d. only as long as necess necessary ary to remove the interfering background 31. When an inspector is working in a darkened area, he/she should become adjusted to the dark before inspecting parts. The generally accepted time period for becoming accustomed to the dark is: a. 1 minute b. 5 to 0 minutes c. 10 to 15 minutes d. no waiting period is necessary 32. When applying penetrant by dipping, heating the penetrant prior to dipping: a. will increase the sensitivity of the test b. will increase incr ease the capillary action of the penetrant c. will increase the stability of the penetrant d. is not generally recommended 33. A penetrant inspection cannot find: a. surface p orosity b. surface cracks c. an internal cavity d. a surface forging lap 34. All of the following materials can be tested by the usual liquid penetrant tests except: ndt- sampleq uestions.bl og spot.i n
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NDT Questi on and Answer
a. unglazed porous cerai b. titanium c. high alloy steel d. cast iron 35. Liquid penetrant penetrant testing can be us ed to detect: a. discontinuities 1.6 mm (0.06 in.) below the surface b. internal disc ontinuiti ontinuities es c. discontinuities open to the surface d. all discontinuiti disc ontinuities es 36. Which of the following are commonly accepted methods for applying penetrant? a. dipping the part in penetrant (dipping) b. pouring the penetrant penetrant over the test s pecimen (flowing) ( flowing) c. spraying the penetrant on the test specimen (spraying) d. all of the above 37. A solvent used to clean the surface of a test specimen must possess all of the following characteristics except that the: a. cleaner must be capable of dissolving oils and greases commonly found on the surface b. cleaner must not be flammable c. cleaner must be free of contaminants d. cleaner must leave a minimal residue on the surface 38. Which of the statements below best states the danger of sandblasting (without subsequent chemical etching) for cleaning surfaces to be penetrant tested? a. the discontinuiti disc ontinuities es m ay be peened over over and closed b. oil contaminants might be sealed in the discontinuities c. the sand used in the sandblasting operation may be forced into the discontinuity d. the sandbla s andblasting sting operation may introduce discontinuities 39. The penetrant applied to the surface of a test specimen: a. seeps into discontinuities b. is absorbed by discontinuities c. is drawn into discontinuities by capillary action d. is drawn into discontinuities by gravity 40. Which of the following statements concerning liquid penetrant testing is correct? a. fluorescent penetrants w ill produce red against white discontinuity dis continuity indications indications b. non-fluorescent penetrants require the use of black lights c. fluorescent indications will be seen when exposed to black light d. nonfluorescent discontinuities glow in the dark for easy viewing and interpretation
ANSWER AN SWER
1.B
2.A
3.D
ndt- sampleq uestions.bl og spot.i n
4.C
5.A
6.D
7.C
8.B
9.D
10.D 10/11
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NDT Questi on and Answer
11.B
12.D
13.D
14.B
15.C
16.C
17.A
18.B
19.C
20.A
21.D
22.A
23.C
24.D
25.D
26.B
27.A
28.B
29.A
30.D
31.B
32.D
33.C
34.A
35.C
36.D
37.B
38.A
39.C
40.C
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