NDT - Eddy Current Level II Practice
Test questions well answered
Which of the following properties is not a significant influence on a conductivity tester? - correct
answer ✔✔ phase shift
What is a key advantage to phase analysis testing systems? - correct answer ✔✔ liftoff maybe
distinguished from conductivity change
Which of the following is a true statement? - correct answer ✔✔ A change in frequency will
affect the conductivity locus curve.
Which of the following is not true of phase analysis systems? - correct answer ✔✔ Material
conditions cannot be determined by phase shift alone.
Which is true of material thickness as related to the conductivity curve? - correct answer ✔✔ As
material thickness increases, sensitivity to thickness variations decreases.
Which statement about suppression of nonrelevant variables is true? - correct answer ✔✔ A
balanced bridge network may operate from any point on the impedance plane.
The inductive reactions component of a test coil's impedance increases with - correct answer
✔✔ the presence of ferromagnetic materials
Which of the following statements is not true regarding the vector point method? - correct
answer ✔✔ The vector point display method is widely used in modern systems.
, How can dimension and conductivity variables be displayed on a digital display using the ellipse
method? - correct answer ✔✔ By the width and angle of tilt, respectively.
In modulation analysis, what type of coil is used? - correct answer ✔✔ differential coil
Which is not true of modulation analysis? - correct answer ✔✔ It is not sensitive to rate of test
object travel.
Which of the following statements is incorrect? - correct answer ✔✔ Alternating current
frequency is defined as cycles per minute.
Medium frequency is used for which measurement? - correct answer ✔✔ Conductivity
measurement
Which is the most important parameter that affects the depth of penetration? - correct answer
✔✔ The test frequency
Which of the following is true regarding the distribution of eddy currents throughout the test
object? - correct answer ✔✔ Eddy currents are most dense at the surface closest to the coil.
Frequency, conductivity, and ___________ affect the depth of penetration. - correct answer
✔✔ permeability
Which of the following does not change with test frequency? - correct answer ✔✔ Material
conductivity.
For a ferromagnetic test object, in which of the following cases will the magnetic permeability
not be a factor on the depth of penetration? - correct answer ✔✔ If the test object is
magnetized to saturation by a separate direct current coil or coils.
Test questions well answered
Which of the following properties is not a significant influence on a conductivity tester? - correct
answer ✔✔ phase shift
What is a key advantage to phase analysis testing systems? - correct answer ✔✔ liftoff maybe
distinguished from conductivity change
Which of the following is a true statement? - correct answer ✔✔ A change in frequency will
affect the conductivity locus curve.
Which of the following is not true of phase analysis systems? - correct answer ✔✔ Material
conditions cannot be determined by phase shift alone.
Which is true of material thickness as related to the conductivity curve? - correct answer ✔✔ As
material thickness increases, sensitivity to thickness variations decreases.
Which statement about suppression of nonrelevant variables is true? - correct answer ✔✔ A
balanced bridge network may operate from any point on the impedance plane.
The inductive reactions component of a test coil's impedance increases with - correct answer
✔✔ the presence of ferromagnetic materials
Which of the following statements is not true regarding the vector point method? - correct
answer ✔✔ The vector point display method is widely used in modern systems.
, How can dimension and conductivity variables be displayed on a digital display using the ellipse
method? - correct answer ✔✔ By the width and angle of tilt, respectively.
In modulation analysis, what type of coil is used? - correct answer ✔✔ differential coil
Which is not true of modulation analysis? - correct answer ✔✔ It is not sensitive to rate of test
object travel.
Which of the following statements is incorrect? - correct answer ✔✔ Alternating current
frequency is defined as cycles per minute.
Medium frequency is used for which measurement? - correct answer ✔✔ Conductivity
measurement
Which is the most important parameter that affects the depth of penetration? - correct answer
✔✔ The test frequency
Which of the following is true regarding the distribution of eddy currents throughout the test
object? - correct answer ✔✔ Eddy currents are most dense at the surface closest to the coil.
Frequency, conductivity, and ___________ affect the depth of penetration. - correct answer
✔✔ permeability
Which of the following does not change with test frequency? - correct answer ✔✔ Material
conductivity.
For a ferromagnetic test object, in which of the following cases will the magnetic permeability
not be a factor on the depth of penetration? - correct answer ✔✔ If the test object is
magnetized to saturation by a separate direct current coil or coils.
