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book quiz Flashcards

1
Q
  1. Magnetic particle” is a nondestructive examination method used for:

A. locating surface discontinuities,
B.near-surface discontinuities
C. both A and B
D. material separation

A

C. both A and B

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2
Q

2 Ferromagnetic material is:

A. strongly attracted by a magnet
B. capable of being magnetized
C. both A and B
D. not capable of being magnetized

A

C. both A and B

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3
Q
  1. The permeability of a material describes:

A.the ease with which it can be magnetized
B. the depth of the magnetic field in the part
C. the length of time required to demagnetize it
D. the ability to retain the magnetic field

A

A

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4
Q

4 The retentivity of a material describes:

A. the ease with which it can be magnetized
B. the depth of the magnetic field in the part
C. the length of time required to demagnetize it
D the ability to retain the magnetic field

A

D the ability to retain the magnetic field

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5
Q

5 Which of the following can be magnetized?

A Iron
B Nickel
C Cobalt
D All of the above

A

A Iron
B Nickel
C Cobalt
D All of the above

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6
Q
  1. An electrical yoke produces:

a longitudinal field
B. a circular field
C. alternating fields
D. a swinging field

A

a longitudinal field

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7
Q

A coil around the part produces:

a circular field
B. a longitudinal field
C.either A or B depending on the type of current applied
D. an intermittent field

A

B. a longitudinal field

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8
Q
  1. In longitudinal magnetization, the proper term for calculating magnetizing force is:

A amperes
B ampere-turns
C either A or B depending on the type of current applied
D. an intermittent field

A

B ampere-turns

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9
Q
  1. Magnetic lines of force

A travel in straight lines
B form a closed loop
C are randomly orientated
D. overlay in highly ferromagnetic materials

A

B form a closed loop

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10
Q
  1. A magnetic particle build-up from a discontinuity is strongest when the discontinuity is orientated

A. 180° to the magnetic field
B. 45° to the magnetic field
C. 90° to the magnetic field
D. 90° to the current flow

A

C. 90° to the magnetic field

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11
Q
  1. To detect lengthwise defects on the inside diameter of hollow parts, you should:

A. pass current through it
B. magnetize with a coil
C pass current through a central conductor
D. increase the amperage use

A

C pass current through a central conductor

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11
Q
  1. The strongest magnetic field in a coil is at the
    A. outside edge
    B.inside edge
    C. centre
    D. end
A

B.inside edge

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12
Q
  1. The point at which the magnetism in a material cannot be increased even though the magnetizing force continues to increase is known as the:

A. salient pole
B. saturation point
C.residual point
D. remnant point

A

B. saturation point

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13
Q
  1. Coercive force:

A. describes the means by which the magnetic particles are suspended in the liquid when using the wet method.
B. describes the magnetizing force used with the continuous method.
C. represents the reverse magnetizing force necessary to remove the residual magnetism in a material
D. is not a term used in magnetic particle testing

A

C. represents the reverse magnetizing force necessary to remove the residual magnetism in a material

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14
Q
  1. Demagnetization:

A. may be accomplished by heating a material above its Curie Point.
B. is always necessary.
C. can be performed only with AC. .
D can be performed only with DC.

A

A. may be accomplished by heating a material above its Curie Point.

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15
Q
  1. Retentivity:

A. represents the ability to induce magnetism in a ferromagnetic body by an outside magnetizing force.
B. represents the ability of a material to resist the establishment of magnetic flux within it.
C, represents the ability of a material to retain a portion of the magnetic field set up in it after the magnetizing force has been removed
D. is not a term used in magnetic particle testing.

A

C, represents the ability of a material to retain a portion of the magnetic field set up in it after the magnetizing force has been removed

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16
Q
  1. A curve is sometimes drawn to show graphically the relation of the magnetizing force to the strength of the magnetic field produced in a certain material. This curve is known as the:

A. magnetic force curve.
B.hysteresis curve
С. saturation curve
D. induction curve

A

B. hysteresis curve

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17
Q
  1. If a copper conductor is placed through a ferrous cylinder and a current is passed through the conductor, then the magnetic field (flux density) in the cylinder will be:

A the same intensity and pattern as in the conductor.
B greater than in the conductor.
C. less than in the conductor.
D. the same regardless of its proximity to the cylinder wall.

A

B greater than in the conductor.

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18
Q
  1. The length of a part being magnetized by passing an electric current from one end to the other:

A. affects the permeability of the part.
B changes the strength of the magnetic field
C.does not affect the strength of the magnetic field.
D. causes the magnetic field to vary.

A

C.does not affect the strength of the magnetic field.

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19
Q
  1. If 25mm and 50mm diameter bars were magnetized by passing the same current through them the magnetic fields would be:

A. the same for both.
B. stronger in the 50mm diameter bar.
С.weaker in the 25mm diameter bar.
D stronger in the 25mm bar

A

D stronger in the 25mm bar

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20
Q
  1. If a current of the same amperage is passed through two conductors of the same dimensions, one of which is magnetic and one of which is nonmagnetic, the magnetic field surrounding the conductors will:

A. be stronger for the magnetic conductor.
B. be stronger for the nonmagnetic conductor.
C. vary with the permeability.
D be the same for both conductors

A

D be the same for both conductors

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21
Q
  1. What equipment is used to determine whether a part has been demagnetized?

A. A magnet on the part.
B residual field meter.
C. A survey meter.
D. Careful observation for clinging magnet particles.

A

B residual field meter.

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22
Q
  1. An electric current through a copper wire

A.creates a magnetic field around the wire.
B. creates magnetic poles in the wire.
C. magnetizes the wire.
D. does not create a magnetic field.

A

A.creates a magnetic field around the wire.

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23
Q
  1. Why should parts be cleaned after demagnetization?

a To ensure that the magnetic particles are removed.
B. To prevent false indications.
C. To save the solids of the suspension.
D. To prevent cracking during heat treatment.

A

a To ensure that the magnetic particles are removed.

24
Q
  1. A specimen may be demagnetized by which of the following methods?

A. Heat treatment above curie temperature.
B. AC coil.
C. Reversing DC fields
D.All of above.

A

A. Heat treatment above curie temperature.
B. AC coil.
C. Reversing DC fields
D.All of above.

25
Q
  1. The amount of amperage used for magnetic particle inspection using the prod method is determined from the:

A. type of material.
B. distance between the prods
С. diameter of the part.
D. total length of the part

A

B. distance between the prods

26
Q
  1. The flux within and surrounding a magnetized part or around a conductor carrying a curre is known as

A. saturation point.
B magnetic field.
C. ferromagnetic.
D. paramagnetic.

A

B magnetic field.

27
Q
  1. Resistance to magnetization

A is greater in hard materials than in soft materials.
B is greater in soft materials than in hard materials
C . is the same for both hard and soft materials.
D. is non-existent

A

A is greater in hard materials than in soft materials.

28
Q

Demagnetization :

A. may be easy or difficult depending on the type of material.
B. is easy for materials having a high permeability.
C is always most difficult in materials retaining a high residual field.
d all of the above answers are correct

A

A. may be easy or difficult depending on the type of material.
B. is easy for materials having a high permeability.
C is always most difficult in materials retaining a high residual field.
d all of the above answers are correct

29
Q
  1. A coil shot is required to be performed after a head shot using the wet continuous method.
    In order to properly conduct the coil shot it is necessary to
    A. remove all residual wet magnetic particle fluid from the part using clean, dry absorbent rags.
    B Demagnetize the part between the head and first coil shot.
    c. place the part in the coil and continue the inspection after evaluating the head shot indications.
    D. none of the above
A

c. place the part in the coil and continue the inspection after evaluating the head shot indication

30
Q
  1. When testing a bar with an L/D ratio of four in a ten-turn coil, the required current would be

A. 45 000 amperes.
B. Unknown, more information is needed.
C. 18 000 amperes.
D. 1 125 amperes.

A

D. 1 125 amperes.

31
Q
  1. Some limitations of coil magnetization techniques are that

A. coil must be of minimum diameter in relation to part.
B. the effective field is generally limited on either side of the coil.
C.small diameter parts should be placed close to the coil.
d.all of the above.

A

d.all of the above.

32
Q
  1. The strength of the wet suspension should be maintained at a given level because

A. a low level might give weak indication.
В.A high level might give heavy background
C Both A and B
D. None of the above.

A

C Both A and B

33
Q
  1. When using the wet particles in a water suspension, wetting agents are added to

A. prevent freezing.
В.prevent corrosion of inspection equipment
c ensure the proper wetting of a part.
D. decrease the amount of water needed.

A

c ensure the proper wetting of a part

34
Q

When preparing an inspection bath, the amount of magnetic particles per litre of fluid is called its

A. measuring scale.
B. particle number.
C.strength or concentration.
D. useable limits.

A

C.strength or concentration.

35
Q
  1. Which of the following is most often used for dry magnetic particle inspection?

A Full cycle direct current.
B Halfwave rectified alternating current.
C High voltage, low amperage current.
D Direct current from electrolytic cells.

A

B Halfwave rectified alternating current.

36
Q
  1. Halfwave rectified AC (HWDC) is used for the detection of

A surface defects only.
b. subsurface defects only.
c. surface and subsurface defects.
D. none of the above.

A

c. surface and subsurface defects.

37
Q
  1. If an overall pattern (sometimes circular lines) appears on the test surfaces, how should the inspector reprocess the test piece?

A. Retest at a higher amperage.
B. Demagnetize.
C Retest at lower amperage.
D Both B and C.

A

D Both B and C.

38
Q
  1. A prime consideration when selecting a powder to be used as a magnetic particle medium is to select a powder that

A. provides a high contrast to the surface being tested.
B. provides a low contrast to the service being tested.
С. will adhere to the surface being tested.
D, requires a high demagnetization current to remove it.

A

A. provides a high contrast to the surface being tested.

39
Q
  1. When testing for fine shallow surface cracks, the preferred MT method should be

A.dry AC.
b. dry DC.
c.wet AC.
D wet DC.

A

c.wet AC.

40
Q
  1. Which residual field is most difficult to demagnetize?

A. Longitudinal.
B Circular.
C Vector.
D. Binodal

A

B Circular.

41
Q

Which of the following is the most effective method for the derection of extremely deep-lying defects?

A. Dry residual method using DC with surge.
B, Wet continuous method using half wave rectified current.
C. Wet residual method.
D. Dry continuous method using half wave rectified current with prods.

A

D. Dry continuous method using half wave rectified current with prods.

42
Q
  1. Which of the following will produce circular magnetism?

A. Passing current through a coil.
b. Placing the test part in a solenoid.
c. Passing current through prods.
D. Yokes.

A

c. Passing current through prods.

43
Q
  1. When using the wet continuous method, the flow of suspension from the hose should be shut off

a. immediately after applying the current.
B immediately before applying the current.
C. while the current is flowing.
D. 30 seconds before applying the current

A

B immediately before applying the current

44
Q
  1. What method provides greater sensitivity, particularly in locating subsurface discontinuities?
    A. Continuous.
    B. Residual.
    C.Circular.
    D. Longitudinal
A

A. Continuous.

45
Q
  1. A break in the magnetic uniformity of a part that is called a magnetic discontinuity is related to a sudden change in

A. inductance.
B. resistivity.
C. capacitance.
D permeability.

A

D permeability.

46
Q
  1. In order to detect defects in different directions in a material by magnetic particle inspection, it is best to use

A two or more fields in different directions.
B. only one field.
C. other probe locations.
D. high frequency field,

A

A two or more fields in different directions.

47
Q

15, The pattern of iron powder sprinkled on a paper placed over a bar magnet is called a

A, field survey.
b magnetometer,
c magnetograph.
d flux meter,

A

c magnetograph.

48
Q

The general term used to refer to a break in the metallic continuity of the part being tested is
A discontinuity.
B. crack.
C. seam.
D. lap.

A

A

49
Q
  1. Internal splines and holes drilled parallel to or near the test surfaces will cause
    A.broad, fuzzy indications directly aligned with the part’s internal contours.
    B. sharp, well-defined indications directly aligned with the part’s internal contours.
    C. no indications.
    D. both A and B above.
A

A

50
Q

What wattage is most commonly used for mercury vapour?
A. 200 watts.
B.50 watts.
C.100 watts
D. 75 watts.

A

C

51
Q
  1. An example of a non-relevant indication that would be classed as a magnetic irregularity rather than an actual discontinuity could be caused by
    A. a slag pocket.
    B. grinding cracks.
    C.an abrupt change in the hardness of part.
    D. none of the above.
A

C

52
Q

Which of the following can cause non-relevant indications?
A. Joints between dissimilar metals
B. Brazed joints.
CRoughing tool cuts on surface.
D All of the above.

A

D

53
Q

Discontinuities in plate, sheet or strip caused by pipe, inclusions or blowholes in the original ingot which, after rolling, are usually flat and parallel to the outside surface, are called
A seams
B laminations.
C.cracks
D.laps

A

B

54
Q

Forging laps occur in what relation to the axial direction of a part?
A. May occur anywhere on surface and may bear no relation to axial direction of the part.
В.Are always found on thermal centreline.
C. Are found on surface of part at a 90 degree angled to the long axis.
D. May occur anywhere in the part and always run in direction of working.

A

A

55
Q

Magnetic particle inspection is not a reliable method of detecting
A. laps.
B.deep-seated cavities.
C. cracks.
D. seams.

A

B

56
Q

When there is absolutely no pattern or distribution of magnetic particles, the possible cause is that
A. the material is non-magnetic.
B. the amperage setting is too low.
C.no current is being applied.
D,any of the above could be true.

A

D

57
Q

What are the three causes of non-relevant indications?
A. Lack of fusion, change of section thickness, grinding cracks.
B.Change of section thickness, very high amperage, drilled hole near surface.
C.Very high amperage, drilled hole near surface, blow holes.
D. Drilled hole near surface, very high amperage, lack of fusion.

A

B

58
Q

The most common failure mechanism associated with sharp fillets, notches, undercuts and seams is
A.fatigue cracking.
B. crystallization.
C.shrinkage.
D. decarburization.

A

A

MT L1 (5 decks)

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