Basic Non-Destructive Testing and Destructive Testing Sample Questions
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Transcript of Basic Non-Destructive Testing and Destructive Testing Sample Questions
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BasicknowledgeofNonDestructiveTesting(NDT)andDestructiveTesting(DT)
1.WhatisNonDestructiveTesting(NDT)?
NDTisthetestingofmaterialstodetectinternalandsurfacedefectsordiscontinuitiesusingmethodswhichdonotdamageordestroythematerialundertest
2.WhatisthedifferentbetweenDefectsordiscontinuities?
Discontinuities:Anyimperfectionorinterruptioninthenormalphysicalstructureorconfigurationofaproduct(cracks,laps,inclusion,etc).Discontinuitymayormaynotaffecttheusefulnessoftheproduct
Defect:Adiscontinuitywhosesize,shape,orientation,locationorpropertiesmakesitdetrimentaltotheusefulserviceoftheproductinwhichitoccursorexceedstheaccept/rejectcriteriaforthegivendesign.Defectisatypeofdiscontinuity.
3.Whatarethemajor5NDTmethods?
Themajor5NDTMethodsare:
a.UltrasonicTesting
b.RadiographyTesting
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c.MagneticParticleTesting
d.DyePenetrantTesting
e.EddyCurrentTesting
4.FordetectionofsurfacewelddefectsordiscontinuitieswhataretheNDTmethodscommonlyused?
TheNDTmethodsarecommonlyusedtodetectthedefect/discontinuitiesonsurfaceweld:
a.VisualTesting(VT)
b.PenetrantTesting(PT)
c.MagneticParticleTesting(MT)
d.EddyCurrentTesting(ET)
5.Fordetectionofinternalwelddefectsordiscontinuities,materialwhataretheNDTmethodscommonlyused?
TheNDTmethodstodetectinternalwelddefect/discontinuities:
a.RadiographicTesting(RT)
b.UltrasonicTesting(UT)
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6.WhatarethefactorsaffectingthechoiceofNDTmethod
Dependsonmanyfactorsandconditions
a.Cost
b.Typeofdefectsought
c.Typeofmaterialtobetested
d.Positionandlocationofdefect
e.Availabilityofequipment
f.Availabilityofqualifiedoperators
g.Workingconditionsandlocation
h.Sensitivityrequired
i.others
7.WhatisDestructiveTesting(DT)?
DestructiveTestingisthetestingofmaterialstodetectinternalandsurfacedefectsordiscontinuitiesbymethodswhichdamagingordestroyingthematerialundertest
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8.WhataretheDT(DestructiveTesting)methodswidelyapplied?
TheDTmethodswidelyusedareasfollows:
a.TensileTest
b.BendTest
c.CharpyTest
d.VickerTest
e.FractureTest
f.FatigueTest
g.CreepTest
h.Replica
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EddyCurrentTestingLevelI(20Questions)
Q.1Generationofeddycurrentsdependsontheprincipleof:
A.waveguidetheory.
B.electromagneticinduction.
C.magnetorestrictiveforces.
D.alloftheabove.
Q.2Asecondaryfieldisgeneratedbythetestobjectandis:
A.equalandoppositetotheprimaryfield.
B.oppositetotheprimaryfield,butmuchsmaller.
C.inthesameplaneasthecoiliswound.
D.inphasewiththeprimaryfield.
Q.3Whenanonferromagneticpartisplacedinthetestcoil,thecoil'svoltage:
A.increases.
B.remainsconstantbecausethisisessential.
C.decreases.
D.shifts90degreesinphase.
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Q.4Eddycurrentsgeneratedinatestobjectflow:
A.inthesameplaneasmagneticflux.
B.inthesameplaneasthecoiliswound.
C.90degreestothecoilwindingplane.
D.Eddycurrentshavenopredictabledirection.
Q.5Thediscoveryofelectromagneticinductioniscreditedto:
A.Arago.
B.Oersted.
C.Maxwell.
D.Faraday.
Q.6Astandarddepthofpenetrationisdefinedasthepointinatestobjectwheretherelativeeddycurrentdensityisreducedto:
A.25percent.
B.37percent.
C.50percent.
D.100percent.
Q.7Calculatethestandarddepthofpenetrationat10kHzincopper=5.7107mhospermeter.
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A.0.1mm
B.0.02mm
C.0.66mm
D.66mm
Q.8Differentialcoilsareusuallyusedin:
A.bobbincoils.
B.probecoils.
C.ODcoils.
D.anyoftheabove.
Q.9Whenusingaprobecoiltoscanatestobject,______
A.theobjectmustbedryandpolished.
B.theobjectmustbescannedcarefullytoinsureinspectioncoverage.
C.theobjectmustbescannedincircularmotionsatconstantspeeds.
D.theprobemustbemovingatalltimestogetareading.
Q.10A"spinningprobe"wouldmostlikelybea(an):
A.bobbincoil.
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B.IDcoil.
C.ODcoil.
D.probecoil.
Q.11A"feedthrough"coilis:
A.acoilwithprimary/secondarywindingsconnectedsothatthesignalisfedthroughtheprimarytothesecondary.
B.anencirclingcoil.
C.anODcoil.
D.bothBandC.
Q.12Wheninspectingatubularproductwithanencirclingcoil,whichstatementisnottrue?
A.ODdiscontinuitiescanbefound.
B.Axialdiscontinuitylocationscanbenoted.
C.Circumferentialdiscontinuitylocationscanbenoted.
D.IDdiscontinuitiescanbefound.
Q.13Anabsolutecoilmeasurementismade
A.bycomparingonespotonthetestobjecttoanother.
B.withoutreferencetoordirectcomparisonwithastandard.
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C.onlywithprobecoils.
D.bycomparativemeasurementtoaknownstandard.
Q.14Whencoilsinadifferentialarrangementareaffectedsimultaneouslywiththesametestobjectvariables,theoutputsignal
A.isdirectlyproportionaltothenumberofvariables.
B.is"0"ornear"0."
C.isindirectlyproportionaltothenumberofvariables.
D.isprimarilyafunctionoftheexcitingcurrent.
Q.15Whichcoiltypeinherentlyhasbetterthermalstability?
A.Bobbin
B.Absolute
C.OD
D.Differential
Q.16Ahybridcoiliscomposedoftwoormorecoils.Thecoils
A.mustbealignedcoplanartothedriveraxis.
B.maybeofwidelydifferentdimensions.
C.mustbeimpedancematchedascloselyaspossible.
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D.areverytemperaturesensitive.
Q.17Properselectionoftestcoilarrangementisdeterminedby:
A.shapeoftestobject.
B.resolutionrequired.
C.sensitivityrequired.
D.alloftheabove.
Q.18Acoil'sresistanceisdeterminedby:
A.wirematerial.
B.wirelength.
C.wirecrosssectionalarea.
D.alloftheabove.
Q.19Inductanceisanalogousto:
A.force.
B.volume.
C.inertia.
D.velocity.
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Q.20Theunitofinductanceisthe:
A.henry.
B.maxwell.
C.ohm.
D.farad.
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
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LiquidPenetrantTestingMethod(40Questions)
1.Whichoneofthefollowingconditionswillaffecttherateandtheextentaliquidpenetrantwillentercracks,fissures,andothersmallopenings?
a.thehardnessofthespecimenbeingtested
b.thesurfaceconditionofthespecimenbeingtested
c.thecolorofthepenetrant
d.theconductivityofthespecimenbeingtested
2.Whichofthefollowingisacommonlyusedclassificationforpenetrant?
a.postemulsifiablepenetrant
b.nonferrouspenetrant
c.chemicaletchpenetrant
d.nonaqueouspenetrant
3.Agenerallyacceptedmethodforremovingexcessnonwaterwashablepenetrantis:
a.repeatedlydippingthetestspecimeninacleaner
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b.soakingthetestspecimeninhotdetergentwater
c.blowingtheexcesspenetrantoffthesurfaceofthepartwithcompressedair
d.wipingandcautiouslycleaningthetestspecimenwithacleanerdampenedcloth
4.Allofthefollowingpartscanbetestedbytheliquidpenetrantmethodexcept:
a.anironcasting
b.analuminumforging
c.apartmadefromaporousplasticmaterial
d.apartmadefromanonporousmaterial
5.Whichofthefollowingdiscontinuitiescanbefoundbythepenetranttestmethod?
a.asurfacecrack
b.asubsurfacecrack
c.aninternalinclusion
d.noneoftheabove
6. Which of the following is generally the more acceptable method for cleaning parts prior to penetrant testing?
a.sandblasting
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b.wirebrushing
c.grinding
d.vapordegreasing
7.Allofthefollowingmethodsarecommonlyusedtocleanpartspriortopenetranttestingexcept:
a.vapordegreasing
b.liquidsolvent
c.powerwirebrushing
d.alkalinecleaner
8.Cuttingoilsmaybeeffectivelyremovedfrompartsbeforepenetranttestingby:
a.preheating
b.vapordegreasing
c.washingwithwater
d.alloftheabove
9.Themostcommontypeofcontaminantinfluorescentpenetrantfluidis:
a.metalfilings
b.oil
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c.detergents(fromcleaning)
d.water
10. Black light, with a proper functioning filter in place, used for fluorescent penetrant inspection can causepermanentdamageto:
a.humantissues
b.humaneyes
c.humanbloodcells
d.noneoftheabove
11.Allofthefollowingbasicinspectionprinciplesapplytothepenetrantmethodsexcept
a.thepenetrantmustenterthediscontinuityinordertoformanindication
b.indicationsglowwhenilluminatedwithablacklight
c.alongerpenetrationtimeisrequiredforsmallerdiscontinuities
d.ifthepenetrantiswashedoutofthediscontinuity,anindicationwillnotbeformedbythatdiscontinuity
12.Subsurfacediscontinuitiescanbebestdetectedby:
a.thepostemulsificationpenetrantmethod
b.thevisibledyepenetrantmethod
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c.thefluorescent,waterwashablepenetrantmethod
d.noneoftheabove
13.Visiblepenetrantmaybeappliedby:
a.brushing
b.spraying
c.dipping
d.noneoftheabove
14.Thefirststepinconductingaliquidpenetranttestonasurfacethathasbeenpaintedisto:
a.carefullyapplythepenetrantoverthesurface
b.completelyremovethepaint
c.thoroughlywashthesurfacewithadetergent
d.wirebrushthesurfacetoroughenthesmoothsurfacecoatingofpaint
15.Whenusingapostemulsificationpenetrant,itisnecessarytoapplytheemulsifier:
a.beforeapplyingthepenetrant
b.afterthewaterwashoperation
c.afterthedwelltimehaselapsed
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d.afterthedevelonmenttimehaselapsed
16.Whenconductingawaterwashableliquidpenetranttest,thewetdeveloperisapplied:
a.immediatelyafterthepenetranthasbeenapplied
b.immediatelybeforethepenetrantisapplied
c.afterremovalofthepenetrant
d.afterremovaloftheemulsifier
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 bleedout of the liquid penetrant for increased contrast and sensitivity,isknownas:
a.blotting
b.capillaryaction
c.concentration
d.attraction
18. Using a black light lamp with a cracked filter or without the filter in place can cause damage to humaneyesbecausethelampemits:
a.blacklight
b.ultravioletlight
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c.infraredlight
d.noneoftheabove
19.Thetermusedtodefinetheperiodoftimeinwhichthetestpartiscoveredwithpenetrantis:
a.waitingtime
b.soaktime(draintime)
c.penetrationtime(dwelltime)
d.bleedintime
20. Usually, the most desirable method of removing excess waterwashable penetrant after the dwell timeisbyusing:
a.alowpressurecoarsewaterspray
b.waterandbrush
c.asolidstreamofwater
d.waterandcleanrags
21. When conducting a liquid penetrant test using a post emulsifiable visible dye penetrant, the generally acceptedmethodforapplyingthewetdeveloperisby:
a.brushing
b.swabbing
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c.dipping
d.spraying
22.Whichofthefollowingcharacteristicsdoesnotapplytoliquidpenetranttesting?
a.thismethodcanaccuratelymeasurethedepthofacrackordiscontinuity
b.thismethodcanbeusedforonsitetestingoflargeparts
c.thismethodcanbeusedtofindshallowsurfacediscontinuities
d.thismethodcanbemademoreorlesssensitivebyusingdifferentpenetrantmaterials
23.Whichofthefollowingdiscontinuitiesismostlikelytobemissedduetoimproperrinsetechniques?
a.aforginglap
b.deeppitting
c.shallowandbroaddiscontinuities
d.therinsetechniquewillnotaffectthedetectionofdiscontinuities
24. When conducting a fluorescent penetrant test, a commonly used technique for assuring that the excesspenetranthasbeenremovedpriortotheapplicationofadeveloperisto:
a.blowcompressedairoverthesurface
b.chemicallyetchthesurface
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c.blotthesurfacewithabsorbentpaper
d.scanthesurfacewithablacklight
25.Whichofthefollowingsurfaceconditionscouldhaveadetrimentaleffectonaliquidpenetranttest?
a.awetsurface
b.aroughweld
c.anoilysurface
d.alloftheabove
26.Liquidpenetranttestingiscapableofdetecting:
a.intergranularstresscorrosioncrackingdiscontinuities
b.discontinuitiesopentothesurface
c.subsurfacediscontinuities
d.alloftheabove
27.Blacklightequipmentisrequiredwhenpenetranttestingby:
a.the.fluorescentpenetrantmethod
b.thevisibledyepenetrantmethod
c.thenonfluorescentpenetrantmethod
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d.alloftheabove
28. The term used to define the tendency of certain liquids to penetrate into small openings such as cracksorfissuresis:
a.saturation
b.capillaryaction
c.blotting
d.wettingagent
29. Excess penetrant (all penetrant except that which is in discontinuities) is removed from the specimen:
a.aftertherequiredpenetrantdwelltimehaselapsed
b.beforetheapplicationofanemulsifierifapostemulsifierpenetrantisused
c.bymeansofasteamcleaner
d.onlywhenwaterwashablepenetrantsareused
30.Whenusingapostemulsifiablepenetrant,theemulsifiertimeshouldbe:
a.aslongasthepenetrantdwelltime
b.halfthepenetrantdwelltime
c.thesameasthedevelopertime
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d.onlyaslongasnecessarytoremovetheinterferingbackground
31. When an inspector is working in a darkened area, he/she should become adjusted to the dark before inspectingparts.Thegenerallyacceptedtimeperiodforbecomingaccustomedtothedarkis:
a.1minute
b.5to0minutes
c.10to15minutes
d.nowaitingperiodisnecessary
32.Whenapplyingpenetrantbydipping,heatingthepenetrantpriortodipping:
a.willincreasethesensitivityofthetest
b.willincreasethecapillaryactionofthepenetrant
c.willincreasethestabilityofthepenetrant
d.isnotgenerallyrecommended
33.Apenetrantinspectioncannotfind:
a.surfaceporosity
b.surfacecracks
c.aninternalcavity
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d.asurfaceforginglap
34.Allofthefollowingmaterialscanbetestedbytheusualliquidpenetranttestsexcept:
a.unglazedporouscerai
b.titanium
c.highalloysteel
d.castiron
35.Liquidpenetranttestingcanbeusedtodetect:
a.discontinuities1.6mm(0.06in.)belowthesurface
b.internaldiscontinuities
c.discontinuitiesopentothesurface
d.alldiscontinuities
36.Whichofthefollowingarecommonlyacceptedmethodsforapplyingpenetrant?
a.dippingthepartinpenetrant(dipping)
b.pouringthepenetrantoverthetestspecimen(flowing)
c.sprayingthepenetrantonthetestspecimen(spraying)
d.alloftheabove
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37. A solvent used to clean the surface of a test specimen must possess all of the following characteristicsexceptthatthe:
a.cleanermustbecapableofdissolvingoilsandgreasescommonlyfoundonthesurface
b.cleanermustnotbeflammable
c.cleanermustbefreeofcontaminants
d.cleanermustleaveaminimalresidueonthesurface
38. Which of the statements below best states the danger of sandblasting (without subsequent chemical etching)forcleaningsurfacestobepenetranttested?
a.thediscontinuitiesmaybepeenedoverandclosed
b.oilcontaminantsmightbesealedinthediscontinuities
c.thesandusedinthesandblastingoperationmaybeforcedintothediscontinuity
d.thesandblastingoperationmayintroducediscontinuities
39.Thepenetrantappliedtothesurfaceofatestspecimen:
a.seepsintodiscontinuities
b.isabsorbedbydiscontinuities
c.isdrawnintodiscontinuitiesbycapillaryaction
d.isdrawnintodiscontinuitiesbygravity
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40.Whichofthefollowingstatementsconcerningliquidpenetranttestingiscorrect?
a.fluorescentpenetrantswillproduceredagainstwhitediscontinuityindications
b.nonfluorescentpenetrantsrequiretheuseofblacklights
c.fluorescentindicationswillbeseenwhenexposedtoblacklight
d.nonfluorescentdiscontinuitiesglowinthedarkforeasyviewingandinterpretation
ANSWER
1.B 2.A 3.D 4.C 5.A 6.D 7.C 8.B 9.D 10.D
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