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Mag Particle > Test > Flashcards

Test Flashcards

1
Q

A material with a permeability of 1000:1 or greater is referred to as:

  • Diamagnetic
  • Paramagnetic
  • Ferromagnetic
  • Nonmagnetic
A

Ferromagnetic

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2
Q

Magnetic lines of force (flux lines):

  • Flow from North to South outside a magnet
  • Follow the path of least resistance
  • Distort and cross at a crack
  • All of the above
A

All of the above

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3
Q

Magnets are made from:

  • Sharp and distinct
  • Copper and aluminum
  • Material with high permeability
  • None of the above
A

Material with high permeability

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4
Q

If a bar magnet was bent into a ring and fused together the magnetic field:

  • Would be contained within the ring
  • Would be stronger than the field in the bar magnet
  • Would easily attract magnetic particles
  • Would be cancelled out and, therefore, would not exist within the ring
A

Would be contained within the ring

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5
Q

A material which, after being magnetized still has a strong magnetic field is said to have:

  • Low permeability
  • High retentively
  • Both a and b
  • High permeability
A

Both a and b

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6
Q

A material which the atoms are easily aligned into magnetic domains would be said to have:

  • Low reluctance
  • High permeability
  • Low retentively
  • All the above
A

All the above

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7
Q

When the point has been reached where a further increase in magnetizing force will not result in an increase in flux density:

  • The material will become nonmagnetic
  • The material is said to be saturated
  • Magnetic hysteresis takes place
  • The part is demagnetized
A

The material is said to be saturated

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8
Q

Surface discontinuities are best detected by using:

  • Rectified three phase AC
  • Alternating current
  • Direct current
  • Half wave direct current
A

Alternating current

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9
Q

When the flux field is parallel to a discontinuity the indication produced would be:

  • Sharp and distinct
  • Broad and fuzzy
  • Weak or nonexistent
  • Linear
A

Weak or nonexistent

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10
Q

The magnetic field created in a part placed inside a current carrying coil is:

  • A vector field
  • A bi-polar field
  • A longitudinal field
A

A longitudinal field

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11
Q

Magnetizing a part in a current carrying coil will permit:

  • Inspection of a long part (36” long or greater) in a single magnetizing operation
  • Detection of circumferential type discontinuities
  • Detection of both surface and subsurface discontinuities if HWDC is used
  • Both b and c
A

Both b and c

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12
Q

When it is desired to inspect the inside surface of a hollow tubular type part it is necessary to:

  • Use a central conductor technique
  • Use about half the amperage you would use if the part were solid
  • Use alternating current
  • None of the above
A

Use a central conductor technique

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13
Q

In order to detect a subsurface discontinuity located parallel with the long axis of a ferromagnetic part, it would be necessary to:

  • Magnetize the part by passing current through the part
  • Create a circular magnetic field in the part
  • Use a direct current, either HWDC or FWDC
  • All the above
A

All the above would be necessary

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14
Q

The strength of a magnetic field within a coil is dependent upon:

  • The number of turns in the coil
  • The current flowing through the coil
  • The diameter of the coil
  • All the above
A

All the above

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15
Q

The magnetic field strength is greatest:

  • While the current is flowing
  • Immediately after the current is turned off
  • When AC is used for magnetization
  • At the center of a solid bar
A

While the current is flowing

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16
Q

When using the dry continuous method the magnetizing current is:

-Usually HWDC
- Applied prior to application of only dry particles
- Allowed to continue flowing while particles are applied and excess particles are removed
- All of the above

A

Allowed to continue flowing while particles are applied and excess particles are removed

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17
Q

When using the dry continuous method the magnetizing current is:

  • Wet continuous
  • Wet residual
  • Dry continuous
  • Dry residual
A

Wet residual

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18
Q

An advantage of using fluorescent particles is:

  • Greater visibility under normal lighting conditions
  • Greater contrast between particle buildup and part surface
  • Inspection time is less than if visible particles
  • All the above
A

Greater contrast between particle buildup and part surface

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19
Q

When using the residual method the magnetic particles:

  • Should be applied just prior to application of the magnetizing force
  • Should be the visible dry powder if AC is used as the magnetizing force
  • Should be applied after the magnetizing operation has been completed
  • None of the above
A

Should be applied after the magnetizing operation has been completed

20
Q

When subsurface discontinuities in a rough weld must be detected, the best method would be to:

  • Wet continuous
  • Dry continuous
  • Wet residual
  • Dry residual
A

Dry continuous

21
Q

When using the wet continuous method the duration of the magnetizing “shot” should be:

  • About one-half to one minute
  • About one-half to one second
  • The duration of the shot is not important
  • Varied depending on the type of material
A

About one-half to one second

22
Q

Stationary equipment may be used to accomplish:

  • Circular magnetization
  • Longitudinal magnetization
  • Detection of fine surface discontinuities
  • All the above
A

All the above

23
Q

When it is desired to detect discontinuities on the inside surface of a hollow tubular type part it would be necessary to:

  • Use higher amperage than if the part were solid
  • Use a wet fluorescent suspension
  • Use the central conductor method
  • Use a head shot
A

Use the central conductor method

24
Q

The formula N I = 45,000 AT/(L/D) is used:

  • To calculate the amperage for a coil shot
  • To calculate the amperage for ahead shot
  • To calculate the amperage for a central conductor shot
  • Both a and c
A

To calculate the amperage for a coil shot

25
Q

A discontinuity that is oriented perpendicular to the long axis of the part would best be detected with:

  • Direct contact method
  • Central conductor method
  • Longitudinal magnetization
  • None of the above would detect this type of discontinuity
A

Longitudinal magnetization

26
Q

When cables are wrapped around a part to fashion a coil:

  • It is recommended that a minimum of 5 wraps be used
  • It is recommended that a minimum of 3 wraps be used
  • It is recommended that AC be used for magnetization in order to detect all discontinuities
  • Both b and c
A

It is recommended that a minimum of 3 wraps be used

27
Q

Using the general rule of thumb, what amperage would be used to circularly magnetize a part that is 2.75” diameter by 13.5” long?

• 1575 amps
• 2225 amps
• 2750 amps
• 3000 amps

A

• 1575 amps

28
Q

The central conductor method:

• Is an indirect method of magnetization
• Can be used with AC current to detect discontinuities on the surface
• Must be used in order to detect discontinuities on the inside surface of a tubular part
• All of the above

A

All of the above

29
Q

What amperage would be required if the part is placed against the inside surface of a 12” diameter, 5 turn coil?

NI=45,000 AT/ (L/D)

• About 2100 amps
• About 1653 amps
• About 1830 amps
• both b and c

A

About 1830 amps

30
Q

When using the contact prods care must be taken to assure good contact with the test surface in order to prevent:

• Overheating (burning) of the surface
• Excessive background indications
• Arcing of the prods on the test surface
• Both a and c

A

Both a and c

31
Q

When inspecting a long round part it may be more practical to attach contact clamps to each end of the part. This would permit the detection of discontinuities that are:

• Not more than 1/2” deep
• Oriented parallel with the long axis of the part
• Oriented perpendicular with the long axis of the part
• On the surface regardless of orientation

A

Oriented parallel with the long axis of the part

32
Q

When performing the settling test what is the purpose of passing the sample through the demagnetizer?

• To increase the settling rate
• To increase the permeability of the particles
• To reduce clumping of the particles
• All of the above

A

To reduce clumping of the particles

33
Q

When using the contact prods normal prod spacing would be:

• 6-8”
• 4-6”
• 2-4”
• Prod spacing would depend on the thickness of the part

A

6-8”

34
Q

An advantage of using an AC yoke is:

• Portability
• Uses standard 115 volt current
• No problem with arcing
• All of the above are advantages

A

All of the above are advantages

35
Q

What amperage would be used when inspecting a weld in a 1” thick plate using the contact prods and a 7” spacing?

• 600-725 amps
• 725- 875 amps
• 700-825 amps
• 700-875 amps

A

700-875 amps

36
Q

The “pie gage” is used to:

• Verify adequacy and direction of magnetic field
• Show orientation of discontinuities
• Verify demagnetization
• All of the above

A

Verify adequacy and direction of magnetic field

37
Q

Demagnetization is the process where by:

• Residual magnetism is removed from the part
• Residual magnetism is reduced to an acceptable level
• A part is placed in a current carrying coil
• The residual magnetic field is reversed in polarity

A

Residual magnetism is reduced to an acceptable level

38
Q

The most practical method of demagnetizing a part is to:

• Pass the part through a current carrying coil
• Use HWDC
• Use AC
• Both a and c

A

Both a and c

39
Q

Although it is possible to demagnetize using circular fields one problem is:

• The coil has a magnetic field that extends only about 6-9 inches on either side of the coil
• There are no external poles, therefore, residual magnetism is difficult to detect
• A circular field is more difficult to cancel out than a longitudinal field
• Much higher currents are required for circular demagnetization than for circular demagnetization

A

There are no external poles, therefore, residual magnetism is difficult to detect

40
Q

Some magnetic particle test units are equipped with a built-in demagnetizing circuit which accomplishes demagnetization through successive “shots”, each with a lower current value than the previous one. This referred to as:

• Step-down demagnetization
• HWDC demagnetization
• Remnant field demagnetization
• Nome of the above

A

Step-down demagnetization

41
Q

A part may not require demagnetization if:

• More than .125” is to be machined from the surface
• The part will be in the vicinity of a moving part such as a gear
• The part has high permeability
• None of the above

A

The part has high permeability

42
Q

The indication of a surface crack would probably appear:

• Sharp and distinct
• Broad and fuzzy
• As a linear indication
• Both a and c

A

Both a and c

43
Q

An indication:

• Is a response that must be interpreted
• Is an accumulation of magnetic particles
• May or may not be cause for rejection
• All of the above

A

All of the above

44
Q

An indication that is caused by a flux leakage due to the configuration of the part, such as a keyway, would be interpreted as:

• A non-relevant indication
• A discontinuity indication
• A false indication
• Cause for rejection

A

A non-relevant indication

45
Q

Indications caused when two parts, one or both having been magnetized, rub against each other are called:

• Defect indications
• False indications
• Magnetic writing
• Both b and c

A

Both b and c

46
Q

What does a field indicator using a Pie Gauge do:

A

Verify field direction

Mag Particle (1 decks)

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