question mt

8/6/2019 Question Mt

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1.The Point at which the magnums in a material can not be increased even those magnetizingforce continues to increase known as the?

A.Salient poleB.Saturation pointC.Residual pointD.Remnant point

2.Which type of current has "skin effect" ?A.AcRDcC.Half-wave rectifiedD.Full-wave rectified

3. Which of the following is most of ton used for dry magnetic particle inspection?A. Full cycle DcB. Half weave Rectified Alternating current (HWAC)C. High voltage low amperage currentD. Direct current from electrolytic cells

4. The area of maximum induced filed strength using a yoke is?A. At the north pole of yokeR At the south pole of yokeC. The area directly between the poleD. On the outside of poles pieces5. Demagnetization?A. may be accomplished by heating a material above its curie pointsB. Italways necessaryC. Can be performed only with AcD. Can be performed only with De

6. Coercive Force?A. Describes the means by which the magnetic particles are suspended in the liquidwhen using wet method

B.Describes the magnetizing force used with the continuous methodC. Represents the reverse magnetizing force necessary to remove the residualmagnetism in a materialD. Is not a term used in magnetic particle testing1


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7. If an overall pattern appears on the test surfaces how should the inspector re-processthe test piece?/~ A. Re-test at a higher amperagev B. DemagnetizeC. Re-test at lower amperage'

D. Botha&bj

8. Which of following can cause non relevant magnetic particle indication?-: A. Joints between dissimilar metalsv B. Brazed joints

C. Roughing tool cuts on surfaceD. All of the above9. When the most complete demagnetization available is described and demagnetizationis to be accomplished by placing the part in a coil energized with AC of progressivelydecreasing amperage the following orientation of the long axis of the part is mostdesirable

A. East-WestB. North-SouthC. South-WestD. North-East

10. Non relevant indication due to residual local poles interface with magnetic particletesting for a successful examination one should

A.Use more amperageB. Demagnetize then remagnetize in the desired directionC. Use lower amperageE. Magnetize in another direct jon

11.A cylindrical parts is to be tested using circular magnetization. the part has threedifferent diameter along its length a rule-of-thumb for current values for each diameterprovides three level the current value that should be applied first is

A. The highest valueB. The median valueC. The lowest valueD. Itis dose not matter which is.applied first

,'2


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12. A five tum coil will be used an a part that is 18"10ng (457mm) and 1.5"dia (38mm)what is LID ratio of the part if 5000A of magnetizing currents is used

A.90~. 12JC. 16.5D. 1.8E. None

13. Unit of viscosityA. Tes1aB. Centistokes -C. Gausses

14.Which of the following is false concerning a magnetic field in and around a hollowconductor as compared to that of a solid conductor as compared to that of a solidconductor of same outside diameter when both are same magnetic material and when theapplied current is same

A.The field outside the outer surface of the hollow conductor is greaterB.The field gradient inside hollow conductor is SteeperC.The field outside the conductors are the sameD.The field of the same at the center

15.A seam welded pipe that had the weld ground flush showed BROAD FUZZYindication wear toes of the weld that extended to complete length of pipe the probablecause of the indication isA. Magnetic writingB. The geometry of the weldC. A surface crackD. A permeability change in the base metal at the HAZ. ~ r

16. A group of indication some sharp and some BROAD AND HAZY were found on anarea of small forging demagnetization and retesting eliminated these indication theprobable cause was

r/ A. A forging lapB. Magnetic writingC. A change in permeabilityD. Sub surface variation 3


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17. A punch press die was surface ground. The magnetic particle testing conductedbefore heat treatment showed short, very fine crack on the ground surface of thedie. Some of the cracks are in clusters. These discontinuities are most likely:A. Stringers.B. Grinding cracks.

-;- C. Seams.D. Forging laps.

18. A cast crankshaft has a surface indication along the length of a machined bearingsurface. the most probable cause of this indication is a:

A. Fatigue crack.B. Cold shut..i. C. Seam.D. Grinding crack.

19. During magnetic particle testing a precipitation hardening steel part appears to becovered whit very small sharp linear indication the most likely cause of these indicationA. Improper grinding procedureLB. LaminationC. Improper machining procedureD. A metallurgical microstructure inherent in some precipitatlon hardening

steels20. Magnetic particles bunch in some fillet area and stand on end on the edge of the partbeing magnetized these observation indicate that theA. Particle concentration is too low

j-- B. Flux density is excessivef c. Flux has the improper orientation

D. Flux density too low21.The ammeter should be checked against a calibration shunt/ammeter

A. At the start of each shiftB. Dailyc. Weekly,\D. Ever six m~nth or as other wise specified .


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22. The magnetizing current ammeter should be calibrated byA. Field strength-meter

4,J/. B. Nothing - installed ammeters are considered to be accurate unless damaged by over

load or accidentc. A calibrated ammeter and master shunt placed between the machine current

contactsD. A calibrated galuano meter and bridge circuit connected across the installed ammeter23. The test used to check the strength or concentration ofthe wet method is called

'y// A. Hardness testB. Sensitivity testC. Settling testD. Hydrometer test

24. When current pass through non-uniform conductors they will produceA. Non-uniform magnetic fields which will decrease when distance increaseB. Non-uniform magnetic fields which.will-increase when increase distanceC. Uniform magnetic fields which will increase when distance increaseD. Uniform magnetic fields which will decrease when distance increase

25. Non-uniform magnetic conductors will produceA. Uniform magnetic fields which will increase when decrease distanceB. Uniform magnetic fields which will decrease when distance decreaseC. Non-uniform magnetic field through the conduct length on out side surface of

the conductorD. None of the above26. Calculate LID Ratio 5 Tum coil which inspecting a job 18" Long and 11/2"DiaA. 2B. 3750C. 12D. None of the above


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27. Which of the following can not detected during settling test for fluorescent wesuspensionA. Excessive particle concentrationB. Back ground fluorescenceC. Percentage of contaminationD. Amount of residual filedE. EffectivenIed 5

28. Magnetic particle testing machine is showing 3000 Amp on its ammeter with no testpiece in the machine which of following reason?A. Test piece is not necessaryB.C. Electrical short circuitD.

29.Which is the correct way to calibrate MT MachineA.B.C. Using shunt with calibrated ammeterD.30. For demagnetization of bigger volume of pipes which of the following is useful

A. Heating to curie per ionB. Ac coilmethodC. Yoke demagnetizationD. De coil method with step down control

31. The porpoise of using copper braiding on contact prod tips isA.Toprovide uniform closer contact on the surface and reduce restively of localhigh current

B.To avoid the possibility of prod damageC. To have clean prodsD. All of the above

32. Which of the following demagnetization is effective/A.Dcstep down reversal

B.Dc coil reversalC. Hwdc reversalD.pulsed current step down


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33. What is fill factor for central conductor method if dia of abject is 5" and diameter ofcentral conductor is 10"

A. 0.25":1B. 0.5':1.

[ 5 1 1 0]2=0.25 , > s - u , Y ~.,. "C. ->D. >

34. Fill factor ratioA.IB.I0:1C2D.None

35.which of the following would give a qualitative reading on amount of flux densitywhen testing residual magnetism

A.Pie gaugeB. ShippingC. Bert hold pentameterD.None of the above

36.Whatis the si unit of flux densityA. GaussB. WeberC. TeslaD. Line/cm2E. A&B

37. What is the 1 line of flux per centimeterA. WeberB. GaussC. TeslaD. Maxwell

38. Which of the following is not suited to day powderA. Slagl/lO"under surfaceB. PorosityC. Tight surfaceD. Very fine shallow surface crack


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39. An inspection method in which a high magnetizing force is applied to a part and theforce is than reduced to a lower continues value which is maintained during applicationof the inspection medium is called

A. Residual methodB. Multi vector methodC. Continues methodD. Surge method

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40. When using De an indication is detected what is the next logical step to determine ifthe indication result from a surface (or) subsurface conduction

A. Re-inspect using surge methodB. Demagnetize and apply powderC. Re-inspect al high amperageD. Re-inspect using Ac

p ,

4!. The coercive force of the ~material whose hysteresis loop is shown above figglVen by ...__--.A. The value of flux density (b) at point aB. The value of the flux density (b) at point gC. The product of band h at point fD. The negative value of h at point c ,~ .

42. Which is the maximum optimum residual fieldA. ABB. BCC. CDD. DE


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43. Which is the coercive forceA. ABB. OBC. DCD. OE

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44. What point is permeability maximumA . AB.BC. CD. DE. G

45. Which one of the skin effect (Following question refer fig-Z)A Fig-AB. Fig-BC. Fig-CD. Fig-D

46. Which of the figures represents a solid non magIletic conductor and Dc currentA .F lgw .e-A ;~ ..B. Figure- B {C. F~gure - C , . 0 , ' , q , i , 'D. Flgure-D :,'

47. Which of the figures represents a hollow magnetic conductor and Dc current\ A t e~~~ ; 1 '(d)

48. Which of the figures represents a soliam~gnetic conductor and Ac current

AFigure-AB.Figure-BC.Figure-CD.Figure-D

A Fig- AB. Fig- BC. Fig- CD. Fig-D

1c J


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I\\A. Fig- AB. Fig- BC. Fig- CD. Fig- D

49. Which of the figures represents a solid magnetic conductor and Dc current

50. Which of the figures represents a hollow non magnetic conductor and Ac current !.~ifIii f! I1\.L _ ~ , : . . ' . ~ ~ ~ _ ,_ _(-r~\\j[.0) )52. Which of the figures represents a hollow non magnetic conductor and Dc current

A. Fig- BB. Fig- CC. Fig- DD. Fig- F

A. Fig- AB. Fig- CC. Fig- DD. Fig- E

53. Which is non magnetic conductor using Ac current testing magnetic cylinder(Following question refer fig-3)A. F'ii-AB. Fig-BC. Fig-CD. Fig-DE. Fig-E

54. Which is magnetic conductor testing magnetic cylinder using Dc currentA. Fig-AB. Fig-BC. Fig-CD. Fig-DE. Fig-E

55. Which is non- magnetic conductor and non-magnetic cylinder using De currentA. Fig-AB. Fig-BC. Fig-CD. Fig-DE. Non of the above


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56. Which is the non- magnetic central conductorA. Fig-AB. Fig-BC. Fig-CD. Fig-D 10E. Fig-EF. Fig-F

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