AT278 Eddy Current QUESTIONS
WELL ANSWERED GRADED
In order to generate measurable eddy currents in a test specimen, the specimen must be - ANS
✔✔a conductor
Changes in the hardness of aluminum alloys will be accompanied by changes in - ANS
✔✔conductivity
The primary purpose(s) of the secondary winding in an eddy current coil is to - ANS ✔✔detect
changes in eddy current flow
The conductivity of a material can be changed by changing the - ANS ✔✔alloy, heat treatment,
temperature
Which of the following will affect the impedance of a test coil? - ANS ✔✔conductivity,
permeability, lift-off
Which of the following is not a basic component of eddy current equipment? - ANS ✔✔liquid
copulant
The ratio of the response or amplitude from signals of interest to the response of amplitude of
indications that contain no useful information for the test being conducted is referred to as -
ANS ✔✔signal-to-noise ratio
eddy currents always travel - ANS ✔✔in closed paths
, In an eddy current testing situation, which of the following can provide sources of noise? - ANS
✔✔instrumentation electronic circuits
nonspecific variations within the test object
electrical interference
Which of the following are common applications for eddy current testing? - ANS
✔✔measurement of conductivity or a combination of conductivity and permeability
measurement of the thickness of thin metal sections, cladding, or coating
detection of surface or a subsurface discontinuities
The characteristics of the alternating magnetic field in the vicinity of the AC coil are affected by -
ANS ✔✔the coil parameters
the magnitude of the applied AC current
the frequency of the applied AC current
The conductivity value of a metal is a function of the - ANS ✔✔heat treatment given the metal
cold working performed on the metal
aging process used on the metal
An eddy current is a circulating electrical current induced in a conducting article by - ANS ✔✔an
alternating magnetic field
Which of the following could be used to suppress unwanted high-frequency harmonics? - ANS
✔✔low-pass filter
IACS is a recognized abbreviation for - ANS ✔✔International Annealed Copper Standard
Direct current saturation coils would most likely be used when testing - ANS ✔✔steel
WELL ANSWERED GRADED
In order to generate measurable eddy currents in a test specimen, the specimen must be - ANS
✔✔a conductor
Changes in the hardness of aluminum alloys will be accompanied by changes in - ANS
✔✔conductivity
The primary purpose(s) of the secondary winding in an eddy current coil is to - ANS ✔✔detect
changes in eddy current flow
The conductivity of a material can be changed by changing the - ANS ✔✔alloy, heat treatment,
temperature
Which of the following will affect the impedance of a test coil? - ANS ✔✔conductivity,
permeability, lift-off
Which of the following is not a basic component of eddy current equipment? - ANS ✔✔liquid
copulant
The ratio of the response or amplitude from signals of interest to the response of amplitude of
indications that contain no useful information for the test being conducted is referred to as -
ANS ✔✔signal-to-noise ratio
eddy currents always travel - ANS ✔✔in closed paths
, In an eddy current testing situation, which of the following can provide sources of noise? - ANS
✔✔instrumentation electronic circuits
nonspecific variations within the test object
electrical interference
Which of the following are common applications for eddy current testing? - ANS
✔✔measurement of conductivity or a combination of conductivity and permeability
measurement of the thickness of thin metal sections, cladding, or coating
detection of surface or a subsurface discontinuities
The characteristics of the alternating magnetic field in the vicinity of the AC coil are affected by -
ANS ✔✔the coil parameters
the magnitude of the applied AC current
the frequency of the applied AC current
The conductivity value of a metal is a function of the - ANS ✔✔heat treatment given the metal
cold working performed on the metal
aging process used on the metal
An eddy current is a circulating electrical current induced in a conducting article by - ANS ✔✔an
alternating magnetic field
Which of the following could be used to suppress unwanted high-frequency harmonics? - ANS
✔✔low-pass filter
IACS is a recognized abbreviation for - ANS ✔✔International Annealed Copper Standard
Direct current saturation coils would most likely be used when testing - ANS ✔✔steel
