Eddy Current Level I Test questions
with complete solutions
The connection between electricity and magnetism by observing how a wire connecting the
ends of a voltaic battery affected a compass in its vicinity was first observed by: - correct answer
✔✔ Hans Orsted.
What is Michael Faraday credited with discovering? - correct answer ✔✔ The effect of
electromagnetic induction.
The flow of eddy currents primarily depends on which of the following? - correct answer ✔✔
Physical and electrical characteristics of the test object.
What do electromagnetic testing instruments typically measure and display? - correct answer
✔✔ Changes in coil impedance.
What type of current is typically employed in electromagnetic testing instruments? - correct
answer ✔✔ Alternating current.
What is the definition of an electrical conductor? - correct answer ✔✔ Any material that is
capable of carrying electrical current.
Which of the following methods or techniques can measure the length and depth of a crack in a
weldment? - correct answer ✔✔ Alternating current field measurement.
One disadvantage of using alternating current field measurement is: - correct answer ✔✔
reduced sensitivity to small discontinuities.
, One disadvantage of using magnetic flux leakage testing is: - correct answer ✔✔ discontinuities
with a major axis parallel to the direction of flux will not likely be detected.
SNT-TC-1A divides electromagnetic testing into three techniques: - correct answer ✔✔ remote
field testing, alternating current field measurement, and eddy current testing.
Which of the following methods or techniques is best suited for sorting alloys? - correct answer
✔✔ Eddy current testing.
Which of the following methods or techniques use a direct current? - correct answer ✔✔
Magnetic flux leakage testing.
When eddy current testing a nonferrous specimen, a discontinuity will: - correct answer ✔✔
decrease the effective conductivity of the specimen.
The number of magnetic lines of forces passing per unit area perpendicular to the direction of a
magnetic field is known as: - correct answer ✔✔ magnetic flux.
Which of the following is the correct definition of electric current? - correct answer ✔✔
Movement of electrons through a conductor.
An eddy current test coil's total opposition to the flow of alternating current is called: - correct
answer ✔✔ impedance.
What is electromotive force (emf)? - correct answer ✔✔ The electrical energy derived from
mechanical, chemical, or other forms of energy that must be applied across the material to
force the electrons to move.
The primary purposes(s) of the secondary winding in an eddy current coil is to: - correct answer
✔✔ detect changes in the eddy current flow.
with complete solutions
The connection between electricity and magnetism by observing how a wire connecting the
ends of a voltaic battery affected a compass in its vicinity was first observed by: - correct answer
✔✔ Hans Orsted.
What is Michael Faraday credited with discovering? - correct answer ✔✔ The effect of
electromagnetic induction.
The flow of eddy currents primarily depends on which of the following? - correct answer ✔✔
Physical and electrical characteristics of the test object.
What do electromagnetic testing instruments typically measure and display? - correct answer
✔✔ Changes in coil impedance.
What type of current is typically employed in electromagnetic testing instruments? - correct
answer ✔✔ Alternating current.
What is the definition of an electrical conductor? - correct answer ✔✔ Any material that is
capable of carrying electrical current.
Which of the following methods or techniques can measure the length and depth of a crack in a
weldment? - correct answer ✔✔ Alternating current field measurement.
One disadvantage of using alternating current field measurement is: - correct answer ✔✔
reduced sensitivity to small discontinuities.
, One disadvantage of using magnetic flux leakage testing is: - correct answer ✔✔ discontinuities
with a major axis parallel to the direction of flux will not likely be detected.
SNT-TC-1A divides electromagnetic testing into three techniques: - correct answer ✔✔ remote
field testing, alternating current field measurement, and eddy current testing.
Which of the following methods or techniques is best suited for sorting alloys? - correct answer
✔✔ Eddy current testing.
Which of the following methods or techniques use a direct current? - correct answer ✔✔
Magnetic flux leakage testing.
When eddy current testing a nonferrous specimen, a discontinuity will: - correct answer ✔✔
decrease the effective conductivity of the specimen.
The number of magnetic lines of forces passing per unit area perpendicular to the direction of a
magnetic field is known as: - correct answer ✔✔ magnetic flux.
Which of the following is the correct definition of electric current? - correct answer ✔✔
Movement of electrons through a conductor.
An eddy current test coil's total opposition to the flow of alternating current is called: - correct
answer ✔✔ impedance.
What is electromotive force (emf)? - correct answer ✔✔ The electrical energy derived from
mechanical, chemical, or other forms of energy that must be applied across the material to
force the electrons to move.
The primary purposes(s) of the secondary winding in an eddy current coil is to: - correct answer
✔✔ detect changes in the eddy current flow.
