ASNT LEVEL III VOCAB WORDS
QUESTIONS AND CORRECT DETAILED
ANSWERS
ACOUSTIC EMISSION - ANSWER Transient elastic waves resulting from local
internal micro-displacements in a material
ACOUSTIC EMISSION ACTIVITY - ANSWER Number of bursts ( or events, if the
approriate conditions are fulfilled) detected during test or part of test
ACOUSTIC EMISSION EVENT - ANSWER Micro-structural displacement that
produces elastic waves in a material under load or stress
ACOUSTIC EMISSION TESTING ( AE ) - ANSWER Passive NDT method that
monitors a component or assembly for transient elastic waves into electrical
signals. Acoustic waves may be movement of micro-structural dislocations during
crack propagation, melting, phase transformation or thermal stresses.
ACOUSTIC IMPEDANCE - ANSWER Frequency dependent property of a medium
through which acoustic waves propagate in units of kg.s-1.m-2. in its simplest
form, acoustic impedance is the product of longitudinal ultrasonic wave velocity
and material density.
RADIOGRAPHIC ACTIVATION - ANSWER the process by which neutrons
bombard stable atoms and make them radioactive.
,RADIOGRAPHIC ACTIVITY - ANSWER Degree of radioactivity of a particular
isotope. expressed as the number of atoms disintegrating per unit of time.
AGING - ANSWER Heat treatment method that alter material properties and
micro structures because of the duration of time at ambient or elevated
tempature
ALTERNATING CURRENT - ANSWER Electric current whose waveform changes
cyclically in magnitude and direction
ALTERNATING CURRENT MAGNETIZATION - ANSWER in mag-particle testing, a
technique for inducing an active magnetic state by a cyclically reversing wave
form, a state generally characterized by its form following ability and by shallow
penetration.
AMPERE - ANSWER SI unit of electric current
ANISOTROPY - ANSWER Material characteristic in which different values of a
property are noted in different directions
ANNEALING - ANSWER process of heating a material to, and holding at, a
desired temperature followed by cooling at a desired rate, usually to reduce
residual stresses or bring about some other desired change.
ANODE - ANSWER (1) in radiography, the positive electrode of a cathode ray
tube that generates ionizing radiation. (2) positively charges terminal , which may
corrode electrochemically during production of a electric current.
, A-SCAN - ANSWER one-dimensional display of ultrasonic echo amplitude as
function of time or depth in test subject.
ASNT - ANSWER American Society for Nondestructive Testing
ATTENUATION - ANSWER (1) decrease in energy or signal magnitude in
transmission form one point to another. (2) Decrease in intensity caused by
absorption, leakage, reflection, scattering or other material characteristics.
BECQUEREL (Bq) - ANSWER SI unit for measurement of radioactivity,
equivalent to one disintegration per second
BETA PARTICLE - ANSWER Electron or positron emitted from a nucleus during
radioactive decay
BOUNDARY ECHO - ANSWER Reflection of an ultrasonic wave for the interface
BRAZING - ANSWER Joining of metals and alloys by fusion of nonferrous alloys
that have a melting point above 806 F. but below melting points of materials being
joined.
BROAD BAND - ANSWER having a relatively wide frequency bandwidth. Used
to describe pulses that display a wide frequency spectrum and receivers capable
of amplifying them.
QUESTIONS AND CORRECT DETAILED
ANSWERS
ACOUSTIC EMISSION - ANSWER Transient elastic waves resulting from local
internal micro-displacements in a material
ACOUSTIC EMISSION ACTIVITY - ANSWER Number of bursts ( or events, if the
approriate conditions are fulfilled) detected during test or part of test
ACOUSTIC EMISSION EVENT - ANSWER Micro-structural displacement that
produces elastic waves in a material under load or stress
ACOUSTIC EMISSION TESTING ( AE ) - ANSWER Passive NDT method that
monitors a component or assembly for transient elastic waves into electrical
signals. Acoustic waves may be movement of micro-structural dislocations during
crack propagation, melting, phase transformation or thermal stresses.
ACOUSTIC IMPEDANCE - ANSWER Frequency dependent property of a medium
through which acoustic waves propagate in units of kg.s-1.m-2. in its simplest
form, acoustic impedance is the product of longitudinal ultrasonic wave velocity
and material density.
RADIOGRAPHIC ACTIVATION - ANSWER the process by which neutrons
bombard stable atoms and make them radioactive.
,RADIOGRAPHIC ACTIVITY - ANSWER Degree of radioactivity of a particular
isotope. expressed as the number of atoms disintegrating per unit of time.
AGING - ANSWER Heat treatment method that alter material properties and
micro structures because of the duration of time at ambient or elevated
tempature
ALTERNATING CURRENT - ANSWER Electric current whose waveform changes
cyclically in magnitude and direction
ALTERNATING CURRENT MAGNETIZATION - ANSWER in mag-particle testing, a
technique for inducing an active magnetic state by a cyclically reversing wave
form, a state generally characterized by its form following ability and by shallow
penetration.
AMPERE - ANSWER SI unit of electric current
ANISOTROPY - ANSWER Material characteristic in which different values of a
property are noted in different directions
ANNEALING - ANSWER process of heating a material to, and holding at, a
desired temperature followed by cooling at a desired rate, usually to reduce
residual stresses or bring about some other desired change.
ANODE - ANSWER (1) in radiography, the positive electrode of a cathode ray
tube that generates ionizing radiation. (2) positively charges terminal , which may
corrode electrochemically during production of a electric current.
, A-SCAN - ANSWER one-dimensional display of ultrasonic echo amplitude as
function of time or depth in test subject.
ASNT - ANSWER American Society for Nondestructive Testing
ATTENUATION - ANSWER (1) decrease in energy or signal magnitude in
transmission form one point to another. (2) Decrease in intensity caused by
absorption, leakage, reflection, scattering or other material characteristics.
BECQUEREL (Bq) - ANSWER SI unit for measurement of radioactivity,
equivalent to one disintegration per second
BETA PARTICLE - ANSWER Electron or positron emitted from a nucleus during
radioactive decay
BOUNDARY ECHO - ANSWER Reflection of an ultrasonic wave for the interface
BRAZING - ANSWER Joining of metals and alloys by fusion of nonferrous alloys
that have a melting point above 806 F. but below melting points of materials being
joined.
BROAD BAND - ANSWER having a relatively wide frequency bandwidth. Used
to describe pulses that display a wide frequency spectrum and receivers capable
of amplifying them.
