Eddy Current Testing questions with
complete solutions
Inductance - correct answer ✔✔ (L) in henrys:
The ability of a conductor to induce voltage in itself
1 Henry (unit) - correct answer ✔✔ The amount of inductance that allows one volt to be
induced when the current changes at the rate of one ampere per second
Faraday's Law - correct answer ✔✔ When a conductor moves through a magnetic field or the
magnetic field across an conductor, a current will flow through the conductor
Inductive reactance - correct answer ✔✔ (XL) in ohms:
Resistance from induced current opposing the originally applied current
Impedance - correct answer ✔✔ (Z) in ohms:
The total of wire resistance and resistance due to inductive reactance
Voltage Plane (graph) - correct answer ✔✔ 90 degree arc from XL to R
Impedance Plane (graph) - correct answer ✔✔ Linear increase (XL increase equally as R
increases)
Coil Mag Field vs Eddy Current Mag Field - correct answer ✔✔ Coil - Large Sine Wave
Eddy Current - Smaller, smoother Sine Wave
, Five uses for Eddy Current Testing - correct answer ✔✔ -Material sorting
-Non conductive coating thickness measurement
-Crack detection
-Material thickness measurement
-Measurement of conductive coatings on conductive base material
IACS stands for - correct answer ✔✔ International Annealed Copper Standard
The test coil is coupled to the test piece by what? - correct answer ✔✔ A magnetic field
What creates eddy currents in a test piece? - correct answer ✔✔ Alternating magnetic field
The generation of eddy currents is most closely compared with the action of what? - correct
answer ✔✔ A transformer
If impedance increases, current flow through the coil does what? - correct answer ✔✔
Decreases
What must the test piece material be such that it can be tested using eddy current testing? -
correct answer ✔✔ Conductive
If frequency of a test coil is increased, what will happen to inductive reactance and impedance?
- correct answer ✔✔ Inductive Reactance: Increase
Impedance: Increase
What four material characteristics will account for conductivity changes? - correct answer ✔✔
Alloy
Heat Treatment
complete solutions
Inductance - correct answer ✔✔ (L) in henrys:
The ability of a conductor to induce voltage in itself
1 Henry (unit) - correct answer ✔✔ The amount of inductance that allows one volt to be
induced when the current changes at the rate of one ampere per second
Faraday's Law - correct answer ✔✔ When a conductor moves through a magnetic field or the
magnetic field across an conductor, a current will flow through the conductor
Inductive reactance - correct answer ✔✔ (XL) in ohms:
Resistance from induced current opposing the originally applied current
Impedance - correct answer ✔✔ (Z) in ohms:
The total of wire resistance and resistance due to inductive reactance
Voltage Plane (graph) - correct answer ✔✔ 90 degree arc from XL to R
Impedance Plane (graph) - correct answer ✔✔ Linear increase (XL increase equally as R
increases)
Coil Mag Field vs Eddy Current Mag Field - correct answer ✔✔ Coil - Large Sine Wave
Eddy Current - Smaller, smoother Sine Wave
, Five uses for Eddy Current Testing - correct answer ✔✔ -Material sorting
-Non conductive coating thickness measurement
-Crack detection
-Material thickness measurement
-Measurement of conductive coatings on conductive base material
IACS stands for - correct answer ✔✔ International Annealed Copper Standard
The test coil is coupled to the test piece by what? - correct answer ✔✔ A magnetic field
What creates eddy currents in a test piece? - correct answer ✔✔ Alternating magnetic field
The generation of eddy currents is most closely compared with the action of what? - correct
answer ✔✔ A transformer
If impedance increases, current flow through the coil does what? - correct answer ✔✔
Decreases
What must the test piece material be such that it can be tested using eddy current testing? -
correct answer ✔✔ Conductive
If frequency of a test coil is increased, what will happen to inductive reactance and impedance?
- correct answer ✔✔ Inductive Reactance: Increase
Impedance: Increase
What four material characteristics will account for conductivity changes? - correct answer ✔✔
Alloy
Heat Treatment
