Conventional MPI Question & Answers_General

1. MAGNETIC PARTICLE TESTING
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1. The pointat whichthe magnetisminthe material cannotbe increasedeventhose
magnetizingforce continuestoincrease isknownas......
a. Silentpole
b. Saturationpoint
c. Residual point
d. Remantpoint
2. Whichtype of currenthas “SkinEffect”?
a. AC
b. DC
c. Half-wave rectified
d. Full-waverectified
3. Whichof the followingismostof timesusedforDry MagneticParticle testing?
a. Full cycle DC
b. HWAC
c. Highvoltage Lowamperage current
d. HWDC
4. The area of maximuminducedfieldstrengthusingayoke is?
a. At Northpole of yoke
b. At Southpole of yoke
c. The area directlybetweenpoles
d. On outside of pole pieces
5. Demagnetization?
a. May be accomplishedbyheatingmaterial above itscurie point
b. It alwaysnecessary
c. Can be performonlywithAC
d. Can be performonlywithDC
6. Coercive force
a. Describesthe meansbywhichthe magneticparticlesare suspendedinthe liquidwhen
usingwetmethod
b. Describe the magnetizingforce usedwiththe continuousmethod
c. Representthe reversemagnetizingforce necessarytoremove the residual magnetismin
a material.
d. Is nota termusedinmagneticparticle testing
7. If an overall patternappearsonthe testsurface how shouldthe inspectorre-processthe
testpiece?
a. Re-testathigheramperage
b. Demagnetize
c. Re-testatloweramperage
d. Both a & b.
8. Whichof the followingcause Non-RelevantIndication?
a. Jointsbetweendissimilarmetals
b. Brazedjoints
c. Roughingtool cutson surface
d. All of the above

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9. Non-RelevantIndicationdue toresiduallocal polesinterface withmagneticparticle testing
for a successful examinationone should
a. Use more amperage
b. Demagnetize thenre-magnetize inthe desired direction
c. Use loweramperage
d. Magnetize inanotherdirection
10. A cylindrical partisto be testedusingcircularmagnetization,the part hasthree different
diametersalongitslengtharule-of-thumbforcurrentvaluesforeachdiameterprovides
three level,the currentvalue thatshouldbe appliedfirstis....
a. The highestvalue
b. The mediumvalue
c. The lowestvalue
d. It does notmatterswhichare appliedfirst.
11. The five turncoil will be usedana part that is18”(457mm) and 1.5”(38mm), whatis L/D
ratioof the part if 5000A of magnetizingcurrentisused...
a. 90
b. 12
c. 16.5
d. 1.8
e. None
12. Unit of viscosityis....
a. Tesla
b. Centistokes
c. Gausses
d. Calorie
13. A groupof indication,some sharpandsome Broad& Hazy were foundonan area of small
forgingdemagnetizationandretestingeliminatedtheseindicationthe probable cause
was.....
a. A forginglap
b. Magneticwriting
c. A change inpermeability
d. Subsurface variation
14. A punchpressdie wassurface ground.The magneticparticle testingconductedbefore heat
treatmentshowedshort,veryfine crackonthe groundsurface of the die.Some of the
cracks are inclusters.These discontinuitiesare most likely......
a. Stringers
b. Grindingcracks
c. Seams
d. Forginglaps
15. A cast crankshafthas a surface indicationalongthe lengthof machinedbearingsurface.The
mostprobable cause of thisindicationis a....
a. Fatigue crack
b. Coldshut
c. Seam
d. Grindingcrack

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16. DuringMPI a precipitationhardeningsteelparttobe coveredwithverysmall sharplinear
indicationthe mostlikelycause of these indication.....
a. Impropergrindingprocedure
b. Lamination
c. Impropermachining procedure
d. A metallurgical microstructure inherentinsome precipitationhardeningsteels
17. Magneticparticlesbunchinsome filletareaandstandon endon the edge of the part being
magnetizedtheseobservationindicatesthatthe.......
a. Particle concentrationistoolow
b. Flux densityisexcessive
c. Flux have improperorientation
d. Flux densitytoolow
18. The ammetershouldbe checkedagainstacalibrationshunt/ammeter...
a. At the start of eachshift
b. Daily
c. Weekly
d. Everysix monthor as otherwise specified.
19. The magnetizingcurrentammetershouldbe calibratedby...
a. Fieldstrengthmeter
b. Nothing– installedammetersare consideredtobe accurate unlessdamagedby
overloadoraccident
c. A calibratedammeterandmastershuntplacedbetweenthe machine currentcontacts
d. A calibratedgaluanometerandbridge circuitconnectedacrossthe installedammeter
20. The test usedtocheck the strengthor concentration of the wetmethodis called...
a. Hardnesstest
b. Sensitivitytest
c. Settlingtest
d. Hydrometertest
21. Whencurrentpass throughnon-uniformconductorstheywill produce...
a. Non-uniformmagneticfieldwhichwillincreasewhenincrease distance
b. Non-uniformmagneticfieldwhichwilldecreasewhendecrease indistance
c. Uniformmagneticfieldwhichwill increase whendistanceincrease
d. Uniformmagneticfieldwhichwill decrease whendistanceincrease
22. Non-uniformmagneticconductorwillproduce...
a. Uniformmagneticfieldwhichwill increase whendecreasedistance
b. Uniformmagneticfieldwhichwill decrease whendistanceincrease
c. Non-uniformmagneticfieldthroughthe conductorlengthon outside surface of the
conductor
d. None of the above
23. Calculate L/Dratio 5 turn coil whichinspectingajob18” Long and 1 1/2 “dia ....
a. 2
b. 3750
c. 12
d. None of the above

4. MAGNETIC PARTICLE TESTING
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24. For demagnetizationof biggervolume of pipeswhichof the followingisused?
a. Heatingto curie point
b. AC coil method
c. Yoke demagnetization
d. DC coil methodwithstepdowncontrol
25. The purpose of usingcopperbreadingoncontact prod tipis:
a. To provide uniformclosercontacttothe surface and reduce resistivityof local high
current
b. To avoidthe possibilityof proddamage
c. To have cleanprods
d. All of the above
26. SI unitof flux densityis
a. Weber
b. Gauss
c. Tesla
d. Maxwell
27. An inspectionmethodinwhichthe highmagnetizingforce isappliedtoapart and the force
isthenreduce to a lowercontinuesvalue whichismaintainduringapplicationof the
inspectionmediumiscalled...
a. Residual method
b. Multi-vectormethod
c. Continuesmethod
d. Surge method
FIGURE -1
28. Whichis the maximumoptimumresidual fieldinfigure-1?
a. AB
b. BC
c. CD
d. DE
29. Whichis coercive force infigure-1?
a. AB
b. OB
c. OC
d. OE
30. What pointispermeabilitymaximum?
a. A
b. B
c. G
d. D

5. MAGNETIC PARTICLE TESTING
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31. To inspectsurface indicationwhichgivesthe bestresult
a. AC currentwithDry particles
b. AC currentwithWetparticles
c. DC current withDry particles
d. DC current withWetparticles
32. Fluorescentmagneticparticle testingshouldbe done under
a. Visiblelight
b. Day light
c. Black light
d. Tube light
33. Whichmagneticfieldismore difficulttodemagnetize?
a. Longitudinal
b. Vector
c. Bimodal
d. Circular
34. Residual magneticparticle technique usedwhen...
a. Parts are irregularinshape
b. Parts are highlyretentive
c. Parts are highlystressed
d. Evaluatingcontinuousmethodindications
35. Magneticparticle inspectionisreliable methodfordetectingall of the followingindications
except;
a. Laps
b. Deepseatedcavities
c. Surface Cracks
d. Seams
36. The strengthof the magneticfieldinducedinthe partisoftenreferredas
a. Currentdensity
b. Voltage
c. Flux density
d. Retentivity
37. Whichform of the magnetizationiseasiesttocontrol inmostparts?
a. Longitudinal magnetization
b. Permanentmagnetism
c. Circularmagnetism
d. Parallel magnetism
38. The materialsare repelledmagneticallyare called
a. Paramagnetic
b. Diamagnetic
c. Ferromagnetic
d. Non-magnetic

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39. The magnitude of the residual magneticfieldinaspecimenisdependenton
a. L/D ratio
b. Strengthof the appliedmagnetizing
c. Righthand rule
d. Lefthand rule
40. A magneticparticle built-upfromadiscontinuityisstrongestwhendiscontinuityisoriented:
a. 180° to the magneticfield
b. 45° to the magneticfield
c. 90° to the magneticfield
d. 90° to the current flow

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1. b 11. d 21. a 31. b
2. a 12. b 22. c 32. c
3. b 13. b 23. c 33. d
4. c 14. b 24. b 34. b
5. a 15. b 25. a 35. b
6. c 16. d 26. b 36. c
7. c 17. b 27. d 37. c
8. d 18. d 28. a 38. b
9. b 19. c 29. c 39. b
10. c 20. c 30. c 40. c