Eddy Current Practise

  • ASTM E426
  • ISO 15548
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| By Ndtputz
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1. A term to define the phenomenon where, at very high frequencies, the eddy current flow is resrticted to an extremely thin outer layer of the conductor is:
Submit
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Theory and application of non destructive testing method eddy current

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2. Eddy current testing relies on the principle of:
Submit
3. A term used to define 2 or more coils electrically connected in opposition such that
any electromagentic condition which is not common to both a test specimen and a
reference specimen will produce an unbalance in the system is:
Submit
4. The thickness of nonconductive coatings on a conductive base can be most simply measured
by:
Submit
5. The symbol commonly used to signify impedance is:
Submit
6. The actual frequency used in any specific eddy current inspection should be selected
on the basis of the:

Submit
7. The conductivity value for a metal is a function of the :
Submit
8. When a rod is placed in an encircling type of coil, the density of eddy currents will be greatest:
Submit
9. When testing by the eddy current method, discontinuities will be most easily detected when the eddy currents are:
Submit
10. Tubing is generally inspected using:
Submit
11. The atoms of a metal showing magnetic characteristics are grouped into regions which
are the smallest known permanent magnets. These regions are called:
Submit
12. When the voltage applied to a circuit and the current through the circuit both reach their
maximums and minimums at the same time, the voltage and current are:
Submit
13. When testing small parts in an eddy current encircling coil for permeability measurements,
which of the following test parameters may be considered important?
Submit
14. When testing ferrous materials, a small but detectable portion of the magnetic flux in the
material will pass outside the metal when a surface discontinuity is encountered. This flux is
called:
Submit
15. The magnetic field generated by eddy currents induced in a test specimen:
Submit
16.  A term used to describe the effect observed due to a change in the electromagnetic coupling
between a test specimen and a probe coil when the distance of separation between them
is varied is:
Submit
17. The term used to define the value of H field required to decrease the remanence of
a material to zero is:
Submit
18. The magnetizing force of an eddy current test coil is usually designated by the:
Submit
19. When a nonmagnetic rod is placed inside an eddy current test coil:
Submit
20. The inductive reactance of a test coil can be calculated using the formula:
Submit
21. The magnetic domains in an unmagnetized ferromagnetic material are:
Submit
22. The heating effect in magnetic materials caused by work required to rotate magnetic
domains can be eliminated by:
Submit
23. When eddy current testing a nonferrous material, the choice of test frequency is determined
by the :
Submit
24. When the electrical current in an eddy current coil reverses direction:
Submit
25. The inductive reactance of a coil is measured in units of:
Submit
26. Which of the following materials would have the highest resistivity value?
Submit
27. When a magnetic material is placed in a region of an applied magnetizing force(H), magnetic
field (B) is developed in the material by means of:
Submit
28. A major problem associated with eddy current test method is the:
Submit
29. The impedance of a test coil usually can be represented by the vector sum of:
Submit
30. The fill factor when a 1/2 inch diameter bar is inserted in a 1 inch diameter coil is:
Submit
31. When the H field strength around a material is increased and then decreased to zero,
the induction field B within the part does not return to zero, the term to define this B
value when H has returned to zero is:
Submit
32. The 3 major specimen parameters which influence eddy current testing are:
Submit
33. Frequency ratio f/f can be defined as:
Submit
34. In eddy current testing, the specimen is coupled to the test coil by:
Submit
35. A term used to define the timing relationship invovled in alternating current signals is:
Submit
36. Which of the following could be used to suppress unwanted high frequency harmonics?
Submit
37. For age hardenable aluminum and titanium alloys, changes in hardness are indicated by
changes in:
Submit
38.  term fill factor applies to:
Submit
39. 2 TEST COILS ARE OFTEN USED IN A BRIDGE CIRCUIT
Submit
40. A method of minimizing the effect of indications caused by gradual dimensional changes while
retaining the indications caused by discontinuities is to:
Submit
41. Which of the following methods may be used to improve the signal-to-noise ratio of an eddy
current test system?
Submit
42. In a test coil consisting of both a primary and secondary winding, the voltage across the
secondary is a function of:
Submit
43. At a fixed test frequency, in which of the following materials will the eddy current
penetration be greatest?
Submit
44. An out-of-phase condition between current and voltage:
Submit
45. Which of the following conditions is not important when selecting specimens to be used
as reference standards?
Submit
46. Which of the following materials would be more likely used as a mounting material for a probe
coil?
Submit
47. Which of the following would be easier to detect in tubing by the eddy current
method using self comparison differential coil arrangement?
Submit
48. A term used to define a material having a permeability less than that of a vacum is
Submit
49. An eddy current system using handling equipment with automatic marking of the defective areas primarily makes it possible to:
Submit
50.  When conducting an eddy current test, variations in the test material can be detected
as variations in:
Submit
51. Doubling the number of turns on a coil will:
Submit
52. When testing tubing, using an encircling (OD) coil, What is the phase relationship of
the output signals from identical ID and OD discontinuities?
Submit
53. The term used to define the difference between actual instrument output and expected
output as defined by a straight line calibration curve is:
Submit
54. To eliminate any dependence upon the number of turns of a test coil, the inductance
values of an impedance diagram are:
Submit
55. A term used to define a surface or internal rupture which is attributed to pprocessing
at low a temperature or excessive working or metal movement during the forging, rolling, or extruding operation is:
Submit
56. The ratio of a material's flux density to a test coil's magnetizing force,(B/H), can be
used to determine the material's:
Submit
57. The flux density in a magnetic material is usually designated by the :
Submit
58. If the characteristic frequency (fq) of a material is 125 hz, the test frequency required
 to give an f/fq ratio of 10 would be:
Submit
59. When eddy current testing tubing with a system that includes a frequency discriminating circuit,
which of the following variables wolud be classified as a high frequency variable?
Submit
60. When eddy current testing by the linear time-base method, what is applied to the vertical
deflection plates of a cathode ray tube when a condition of unbalance exist between the test specimen and the reference standard?
Submit
61. The ratio of the specific diameter of a probe to the minimum discontinuity of interest should be:
Submit
62. The penetration of eddy currents in a conductive material is decreased when:
Submit
63. In order to decrease the effect on conductivity readings due to variations in test part thickness:
Submit
64. If the test frequency increases while field strength is held constant, the surface  density:
eddy current
Submit
65. Which of the following coil arrangements would eliminate or decrease the effects of minor variations in diameter, chemical  composition, hardness, etc, which occur gradually
 along the length of a wire?
Submit
66. Which of the following is not a commonly used eddy current testing readout mechanism?
Submit
67. The impedance change of an eddy current test coil due to a change in the test part
characteristics can be most easily analyzed as a combined change in:
Submit
68. A decrease in conductivity is equivalent to:
Submit
69. A term used to define an eddy current test coil which uses magnetic material to purposely
shape the magnetic field is:
Submit
70. The formula used to calculate the impedance of an eddy current test coil is:
Submit
71. When testing magnetic materials in a ac field, increasing the field strength:
Submit
72. A term used to define an instrumentation technique which discriminates between
variables in the test part by the different phase angle changes which these conditions
produce in the test signal is:
Submit
73. When eddy current testing by the ellipse method, the normal indication when the test specimen and reference standard are the same is approximately:
Submit
74. The circuits which make it possible to minimize the effect of signals caused by variables
of no interest on the readout mechanism are based on differences in:
Submit
75. A term used to define a surface coil mounted so that the coil can be rotated about the
circumference of a test specimen is:
Submit
76. The  vector-point, ellipse, and linear time-base methods are all subdivisions of the:
Submit
77. As the fill factor decreases, the impedance variation of a pickup coil produced
by a given chaange in conductivity will:
Submit
78. It is frequently possible to separate the conductivity variable from the permeability and
dimensional variables when using:
Submit
79. A term used to define a system which indicates only the magnitude of variations in the total
coil impedance regardless of the phase or direction in which it occurs on an impedance plane is:
Submit
80. When a coil's magnetizing force is applied to a ferromagnetic material, the flux density
in the material is:
Submit
81. When eddy current testing by ellipse method, one variable may be indicated by the angle
of the ellipse or straight line while another variable may be indicated by the:
Submit
82. Impedance diagrams have been mathematically derived and experimentally verified for materials
of any conductivity and permeability having rectangular, cylindrcal, or spherical symmetry. To
test all specimens of similar geometry under the same condition, it is only necessary to choose a test frequency, (f), so that frequency ratio f/f lies at the same point on the impedance diagram for each specimen. This principle is based upon:
Submit
83. In modulation analysis testing, which of the following would not modulate the test
frequency applied to the test coil?
Submit
84. A term to define a property of a test system which enables the separation of signals due
to discontinuities in the test specimen that are located in close proximity to each other is:
Submit
85. A term used to define any change in a sinusoidal signal when the output is not a linear
reproduction of the input is:
Submit
86. Which of the following is not a factor that affects the inductance of an eddy current test coil?
Submit
87. In inspecting ferromagnetic materials, relatively low frequencies are normally used because
of the:
Submit
88. If the conductivity of a test part in an eddy current test coil decreases, the magnitude
of the eddy currents at a given depth in the test specimen:
Submit
89. An eddy current test coil's magnetic field intensity in air:
Submit
90. When eddy current testing by the linear time base method, what is applied to the vertical
deflection plates of a cathod ray tube when the test specimen and reference standard are
the same and the balance controls are properly adjusted?
Submit
91. To be useful, limit frequency equations must be:
Submit
92. The use of magnetic shielding around the exciting coil will generally:
Submit
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A term to define the phenomenon where, at very high frequencies, the...
Eddy current testing relies on the principle of:
A term used to define 2 or more coils electrically connected in...
The thickness of nonconductive coatings on a conductive base can be...
The symbol commonly used to signify impedance is:
The actual frequency used in any specific eddy current inspection...
The conductivity value for a metal is a function of the :
When a rod is placed in an encircling type of coil, the density of...
When testing by the eddy current method, discontinuities will be most...
Tubing is generally inspected using:
The atoms of a metal showing magnetic characteristics are grouped into...
When the voltage applied to a circuit and the current through the...
When testing small parts in an eddy current encircling coil for...
When testing ferrous materials, a small but detectable portion of the...
The magnetic field generated by eddy currents induced in a test...
 A term used to describe the effect observed due to a change in...
The term used to define the value of H field required to decrease the...
The magnetizing force of an eddy current test coil is usually...
When a nonmagnetic rod is placed inside an eddy current test coil:
The inductive reactance of a test coil can be calculated using the...
The magnetic domains in an unmagnetized ferromagnetic material are:
The heating effect in magnetic materials caused by work required to...
When eddy current testing a nonferrous material, the choice of test...
When the electrical current in an eddy current coil reverses...
The inductive reactance of a coil is measured in units of:
Which of the following materials would have the highest resistivity...
When a magnetic material is placed in a region of an applied...
A major problem associated with eddy current test method is the:
The impedance of a test coil usually can be represented by the vector...
The fill factor when a 1/2 inch diameter bar is inserted in a 1 inch...
When the H field strength around a material is increased and then...
The 3 major specimen parameters which influence eddy current testing...
Frequency ratio f/f can be defined as:
In eddy current testing, the specimen is coupled to the test coil by:
A term used to define the timing relationship invovled in alternating...
Which of the following could be used to suppress unwanted high...
For age hardenable aluminum and titanium alloys, changes in hardness...
 term fill factor applies to:
2 TEST COILS ARE OFTEN USED IN A BRIDGE CIRCUIT
A method of minimizing the effect of indications caused by gradual...
Which of the following methods may be used to improve the...
In a test coil consisting of both a primary and secondary winding, the...
At a fixed test frequency, in which of the following materials will...
An out-of-phase condition between current and voltage:
Which of the following conditions is not important when selecting...
Which of the following materials would be more likely used as a...
Which of the following would be easier to detect in tubing by the eddy...
A term used to define a material having a permeability less than that...
An eddy current system using handling equipment with automatic marking...
 When conducting an eddy current test, variations in the test...
Doubling the number of turns on a coil will:
When testing tubing, using an encircling (OD) coil, What is the phase...
The term used to define the difference between actual instrument...
To eliminate any dependence upon the number of turns of a test coil,...
A term used to define a surface or internal rupture which is...
The ratio of a material's flux density to a test coil's magnetizing...
The flux density in a magnetic material is usually designated by the :
If the characteristic frequency (fq) of a material is 125 hz, the test...
When eddy current testing tubing with a system that includes a...
When eddy current testing by the linear time-base method, what is...
The ratio of the specific diameter of a probe to the minimum...
The penetration of eddy currents in a conductive material is decreased...
In order to decrease the effect on conductivity readings due to...
If the test frequency increases while field strength is held constant,...
Which of the following coil arrangements would eliminate or decrease...
Which of the following is not a commonly used eddy current testing...
The impedance change of an eddy current test coil due to a change in...
A decrease in conductivity is equivalent to:
A term used to define an eddy current test coil which uses magnetic...
The formula used to calculate the impedance of an eddy current test...
When testing magnetic materials in a ac field, increasing the field...
A term used to define an instrumentation technique which discriminates...
When eddy current testing by the ellipse method, the normal indication...
The circuits which make it possible to minimize the effect of signals...
A term used to define a surface coil mounted so that the coil can be...
The  vector-point, ellipse, and linear time-base methods are all...
As the fill factor decreases, the impedance variation of a pickup coil...
It is frequently possible to separate the conductivity variable from...
A term used to define a system which indicates only the magnitude...
When a coil's magnetizing force is applied to a ferromagnetic...
When eddy current testing by ellipse method, one variable may be...
Impedance diagrams have been mathematically derived and experimentally...
In modulation analysis testing, which of the following would not...
A term to define a property of a test system which enables the...
A term used to define any change in a sinusoidal signal when the...
Which of the following is not a factor that affects the inductance of...
In inspecting ferromagnetic materials, relatively low frequencies are...
If the conductivity of a test part in an eddy current test coil...
An eddy current test coil's magnetic field intensity in air:
When eddy current testing by the linear time base method, what is...
To be useful, limit frequency equations must be:
The use of magnetic shielding around the exciting coil will generally:
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