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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
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
Longitudinal magnetization
26
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
It is recommended that a minimum of 3 wraps be used
27
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
• 1575 amps
28
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
All of the above
29
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
About 1830 amps
30
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
Both a and c
31
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
Oriented parallel with the long axis of the part
32
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
To reduce clumping of the particles
33
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
6-8”
34
An advantage of using an AC yoke is: • Portability • Uses standard 115 volt current • No problem with arcing • All of the above are advantages
All of the above are advantages
35
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
700-875 amps
36
The “pie gage” is used to: • Verify adequacy and direction of magnetic field • Show orientation of discontinuities • Verify demagnetization • All of the above
Verify adequacy and direction of magnetic field
37
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
Residual magnetism is reduced to an acceptable level
38
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
Both a and c
39
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
There are no external poles, therefore, residual magnetism is difficult to detect
40
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
Step-down demagnetization
41
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
The part has high permeability
42
The indication of a surface crack would probably appear: • Sharp and distinct • Broad and fuzzy • As a linear indication • Both a and c
Both a and c
43
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
All of the above
44
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 non-relevant indication
45
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
Both b and c
46
What does a field indicator using a Pie Gauge do:
Verify field direction

Mag Particle (1 decks)

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