ASNT LEVEL III CORE EXAM MANUAL QUESTIONS AND
ANSWERS GRADED A+
✔✔COSINE LAW - ✔✔physical law stating that the illumination of a surface varies as
the cosine of the incidence angle. Maximum illumination is obtained where the cosin
equals one and when the source is perpendicular to the surface.
✔✔COUPLED - ✔✔(1) two electric currents having an impedance in common so that a
current in one causes a voltage in the other (2) two coils sharing parts of their magnetic
flux paths
✔✔COUPLING (ELECTROMAGNETIC TESTING) - ✔✔percentage of magnetic flux
from a primary circuit that links a secondary circuit. effectiveness of a coil in inducing
eddy currents in the test object.
✔✔CRITICAL ANGLE (ULTRASONIC TESTING) - ✔✔incident angle of the ultrasonic
beam where the refracted beam is parallel to the surface and above which a specific
mode of refraction energy no longer exists.
✔✔C-SCAN - ✔✔acoustic data displaying an image of two-dimensional test object with
scaled grays or colors representing the ultrasonic signals.
✔✔DEAD ZONE ( ULTRASONIC TESTING) - ✔✔interval following the initial pulse at
the surface of a test object to the nearest inspection depth. any interval following a
reflected signal where additional signals cannot be detected.
✔✔NONAQUEOUS WET DEVELOPER - ✔✔fine particles suspended in a volatile
solvent that assists bleedout by diluting the penetrant.
✔✔SOLUBLE DEVELOPER - ✔✔fine particles completely soluble in its carrier that
dries to form an absorptive coating.
✔✔SUSPENDIBLE DEVELOPER - ✔✔fine particle suspended in water and that dries to
an absorptive coating. Applied to the [part after removal of excess liquid penetrant and
before drying.
✔✔DIFFRACTION (ULTRASONIC TESTING) - ✔✔deflection of a wave front when
passing the edge of an ultrasonically opaque object.
✔✔DUCTILITY - ✔✔ability of a material to undergo plastic deformation without fracture.
✔✔DYNAMIC RANGE (ULTRASONIC TESTING) - ✔✔ratio of maximum to minimum
reflective areas that can be distinguished on the display at a constant gain setting.
, ✔✔EMULSIFIER - ✔✔liquid that mixes with a oily penetrant such that the mixture can
then be washed away with water.
✔✔HYDROPHILIC EMULSIFIER - ✔✔water based liquid that interacts with the liquid
penetrant oil in the manner of a detergent, allowing the penetrant to become water
washable
✔✔LIPOPHILIC EMULSIFIER - ✔✔oil based liquid that mixes with liquid penetrant oil to
form an emulsion that can be removed from the surface with water.
✔✔FELICITY EFFECT (ACOUSTIC EMISSION) - ✔✔appearance of significant acoustic
emission at a load ( or pressure) level below the previous maximum applied.
✔✔FILL FACTOR ( MAG-PARTICLE) - ✔✔the ratio of the cross sectional area of the
coil divided by the cross sectional area of the specimen. (high-less than 2) (intermediate
2-10) (low- grater than 10)
✔✔GRAIN - ✔✔individual crystal in a polycrystalline material
✔✔HYSTERESIS LOOP - ✔✔curve showing flux density B plotted as a function of
magnetizing force H as H is increased to the saturation point in both negative and
positive directions sequentially. the curve forms a characteristic loop.
✔✔IMMERSION TECHNIQUE (ULTRASONIC TESTING) - ✔✔technique in which the
test object and the transducer are submerged in a liquid (usually water) that acts as the
coupling medium. the transducer is not usually in contact with the test object
✔✔IMPEDANCE - ✔✔opposition that a circuit presents to flow of an alternating current
especially the complex quotient of voltage divided by current.
✔✔INDUCTANCE - ✔✔property of electric circuit, by which current in it or a nearby
circuit creates magnetic flux in the other circuit.
✔✔ION CURRENT (LEAK TESTING) - ✔✔current that flows at all times from the
positive emitter (heater) to the negative cathode collector of the heated anode (alkali
ion) halogen vapor detector
✔✔IONIZING RADIATION - ✔✔form of electromagnetic radiation that can displace
orbital electrons from atoms. types include X-rays, gamma rays and particles such as
neutrons.
✔✔KAISER EFFECT - ✔✔in acoustic emission testing, absence of detectable acoustic
emission until the previous maximum applied stress level has been exceeded.
ANSWERS GRADED A+
✔✔COSINE LAW - ✔✔physical law stating that the illumination of a surface varies as
the cosine of the incidence angle. Maximum illumination is obtained where the cosin
equals one and when the source is perpendicular to the surface.
✔✔COUPLED - ✔✔(1) two electric currents having an impedance in common so that a
current in one causes a voltage in the other (2) two coils sharing parts of their magnetic
flux paths
✔✔COUPLING (ELECTROMAGNETIC TESTING) - ✔✔percentage of magnetic flux
from a primary circuit that links a secondary circuit. effectiveness of a coil in inducing
eddy currents in the test object.
✔✔CRITICAL ANGLE (ULTRASONIC TESTING) - ✔✔incident angle of the ultrasonic
beam where the refracted beam is parallel to the surface and above which a specific
mode of refraction energy no longer exists.
✔✔C-SCAN - ✔✔acoustic data displaying an image of two-dimensional test object with
scaled grays or colors representing the ultrasonic signals.
✔✔DEAD ZONE ( ULTRASONIC TESTING) - ✔✔interval following the initial pulse at
the surface of a test object to the nearest inspection depth. any interval following a
reflected signal where additional signals cannot be detected.
✔✔NONAQUEOUS WET DEVELOPER - ✔✔fine particles suspended in a volatile
solvent that assists bleedout by diluting the penetrant.
✔✔SOLUBLE DEVELOPER - ✔✔fine particles completely soluble in its carrier that
dries to form an absorptive coating.
✔✔SUSPENDIBLE DEVELOPER - ✔✔fine particle suspended in water and that dries to
an absorptive coating. Applied to the [part after removal of excess liquid penetrant and
before drying.
✔✔DIFFRACTION (ULTRASONIC TESTING) - ✔✔deflection of a wave front when
passing the edge of an ultrasonically opaque object.
✔✔DUCTILITY - ✔✔ability of a material to undergo plastic deformation without fracture.
✔✔DYNAMIC RANGE (ULTRASONIC TESTING) - ✔✔ratio of maximum to minimum
reflective areas that can be distinguished on the display at a constant gain setting.
, ✔✔EMULSIFIER - ✔✔liquid that mixes with a oily penetrant such that the mixture can
then be washed away with water.
✔✔HYDROPHILIC EMULSIFIER - ✔✔water based liquid that interacts with the liquid
penetrant oil in the manner of a detergent, allowing the penetrant to become water
washable
✔✔LIPOPHILIC EMULSIFIER - ✔✔oil based liquid that mixes with liquid penetrant oil to
form an emulsion that can be removed from the surface with water.
✔✔FELICITY EFFECT (ACOUSTIC EMISSION) - ✔✔appearance of significant acoustic
emission at a load ( or pressure) level below the previous maximum applied.
✔✔FILL FACTOR ( MAG-PARTICLE) - ✔✔the ratio of the cross sectional area of the
coil divided by the cross sectional area of the specimen. (high-less than 2) (intermediate
2-10) (low- grater than 10)
✔✔GRAIN - ✔✔individual crystal in a polycrystalline material
✔✔HYSTERESIS LOOP - ✔✔curve showing flux density B plotted as a function of
magnetizing force H as H is increased to the saturation point in both negative and
positive directions sequentially. the curve forms a characteristic loop.
✔✔IMMERSION TECHNIQUE (ULTRASONIC TESTING) - ✔✔technique in which the
test object and the transducer are submerged in a liquid (usually water) that acts as the
coupling medium. the transducer is not usually in contact with the test object
✔✔IMPEDANCE - ✔✔opposition that a circuit presents to flow of an alternating current
especially the complex quotient of voltage divided by current.
✔✔INDUCTANCE - ✔✔property of electric circuit, by which current in it or a nearby
circuit creates magnetic flux in the other circuit.
✔✔ION CURRENT (LEAK TESTING) - ✔✔current that flows at all times from the
positive emitter (heater) to the negative cathode collector of the heated anode (alkali
ion) halogen vapor detector
✔✔IONIZING RADIATION - ✔✔form of electromagnetic radiation that can displace
orbital electrons from atoms. types include X-rays, gamma rays and particles such as
neutrons.
✔✔KAISER EFFECT - ✔✔in acoustic emission testing, absence of detectable acoustic
emission until the previous maximum applied stress level has been exceeded.
