EDDY CURRENT 2 STUDY GUIDE
questions well answers
What properties of material affect the eddy current induced in the test object? - ANS
✔✔conductivity, permeability, dimension
Conductivity of a material is defined as the ability of the material to carry______? - ANS
✔✔electrical current
In IACS (International Annealed Copper Standard) the conductivity of unalloyed (pure) ______
of 100% was selected as the standard, and the conductivities of all other materials are
expressed as a percentage of this standard? - ANS ✔✔annealed copper
A change in hardness that is brought about by the internal change in the material that affects
the conductivity and/or permeability of the material is generally an indication of ______? - ANS
✔✔improper heat treatment
An increase of temperature of the material normally results in a decrease in the ______ of the
material. - ANS ✔✔conductivity
As the coil approaches the edge of a test object, eddy currents become distorted by the edge
signal. This is known as ______? - ANS ✔✔edge effect
Electromagnetic tests are most sensitive to test objects variables nearest the test coil due to
______? - ANS ✔✔skin effect
The depth of penetration is defined as the distance from the surface of the object to the point
where the current density is about ______ % of the current density at the surface. - ANS ✔✔37
questions well answers
What properties of material affect the eddy current induced in the test object? - ANS
✔✔conductivity, permeability, dimension
Conductivity of a material is defined as the ability of the material to carry______? - ANS
✔✔electrical current
In IACS (International Annealed Copper Standard) the conductivity of unalloyed (pure) ______
of 100% was selected as the standard, and the conductivities of all other materials are
expressed as a percentage of this standard? - ANS ✔✔annealed copper
A change in hardness that is brought about by the internal change in the material that affects
the conductivity and/or permeability of the material is generally an indication of ______? - ANS
✔✔improper heat treatment
An increase of temperature of the material normally results in a decrease in the ______ of the
material. - ANS ✔✔conductivity
As the coil approaches the edge of a test object, eddy currents become distorted by the edge
signal. This is known as ______? - ANS ✔✔edge effect
Electromagnetic tests are most sensitive to test objects variables nearest the test coil due to
______? - ANS ✔✔skin effect
The depth of penetration is defined as the distance from the surface of the object to the point
where the current density is about ______ % of the current density at the surface. - ANS ✔✔37
