ASNT LEVEL III ALL 2026 CORE EXAM TEST QUESTIONS
AND ANSWERS GUARANTEE A+
✔✔Which of the following systems or components are not good candidates for leak
testing?
a. Piping and pressure vessels.
b. Refrigeration piping.
c. Vacuum chambers.
d. Sintered material components. - ✔✔d. Sintered material components.
✔✔A helium mass spectrometer is used in which of the following NDT techniques or
methods?
a. Leak testing.
b. X-ray spectroscopy.
c. Optical holography.
d. Acoustic holography. - ✔✔a. Leak testing.
✔✔Which of the following is a technique of leak testing?
a. Static.
b. Gaseous diffusion.
c. Dynamic.
d. Detector probe. - ✔✔d. Detector probe.
✔✔Potentially the most sensitive leak testing technique is the:
a. bubble test.
b. pressure change test.
c. mass spectrometer test.
d. liquid penetrate test. - ✔✔c. mass spectrometer test.
✔✔Establishing differential pressure between the test object and environment is an
essential element in which of the following NDT methods?
a. X-ray diffraction.
b. Leak testing.
c. Neutron radiography.
d. Electromagnetic testing. - ✔✔b. Leak testing.
✔✔Which of the following best describes the type of leak test used when the interior of
the test object is evacuated and a tracer gas is applied to the exterior, while the leak
detector is connected to the evacuating system?
a. Static leak test.
b. Helium leak test.
c. Dynamic leak test.
d. Halogen leak test. - ✔✔c. Dynamic leak test.
,✔✔Assuming no significant leakage, if the temperature increases, during a pressure
drop leak test, the pressure in the system under test would:
a. increase.
b. remain the same.
c. decrease.
d. first increase, then decrease to its former level. - ✔✔a. increase.
✔✔If the sensitivity of the halogen leak detector is constant throughout a test, which of
the following is true upon completion of the test?
a. No leaks smaller than a certain size have gone undetected.
b. The total leak rate of the test object is less than a certain amount.
c. The instrument and the test procedure were capable of detecting leakage of a certain
size during the test.
d. The instrument and test procedure were only capable of detecting leakage of a
certain size upstream of the tracer gas during the test. - ✔✔c. The instrument and the
test procedure were capable of detecting leakage of a certain size during the test.
✔✔All leak detection techniques are dependent upon:
a. barometric pressure
b. gas or fluid flow.
c. mass spectrometer analysis.
d. mean free paths of helium flow. - ✔✔b. gas or fluid flow.
✔✔In an evacuated system, sensitivity of a pressure change leak test is dependent not
only on the pressure change observed, but also on the degree of outgassing.
Outgassing is best defined as:
a. the release of gas from materials in a vacuum.
b. being directly proportional to the temperature of the gas.
c. the viscosity of the pressurizing gas.
d. the drop in test pressure due to leakage from the vacuum manifold. - ✔✔a. the
release of gas from materials in a vacuum.
✔✔The tendency of a liquid penetrant to enter a discontinuity is primarily related to:
a. the viscosity of the penetrant.
b. capillary forces.
c. the chemical inertness of the penetrant.
d. the specific gravity of the penetrant. - ✔✔b. capillary forces.
✔✔Liquid penetrant testing is a nondestructive method that can be used for:
a. locating and evaluating all types of discontinuities in a test specimen.
b. locating and determining the length, width, and depth of discontinuities in a test
specimen.
c. determining the tensile strength of a test specimen.
d. located discontinuities open to the surface. - ✔✔d. located discontinuities open to the
surface.
,✔✔Which of the following is not a characteristic that applies to liquid penetrant testing?
a. This method can accurately measure the depth of a crack or discontinuity.
b. This method can be used for on-site testing of large parts.
c. This method can be used to find shallow surface discontinuities.
d. This method can be made more or less sensitive by using different penetrant
materials. - ✔✔a. This method can accurately measure the depth of a crack or
discontinuity.
✔✔The property of a dye used in penetrant materials to emit light in the range of
wavelengths different from the wavelength of light that excites the emission is called:
a. emissivity.
b. irradiation.
c. spectrum blocking.
d. fluorescence. - ✔✔d. fluorescence.
✔✔When using a fluorescent, post-emulsifier penetrant, the length of time the emulsifier
is allowed to remain on the part is critical for detecting shallow discontinuities. The
optimum length of time should be:
a. 10 seconds.
b. 5 seconds.
c. 2-3 minutes.
d. determined by experimentation. - ✔✔d. determined by experimentation.
✔✔A red penetrant indication against white background is most likely to be seen when:
a. dry developers are used.
b. visible dye penetrants are used.
c. fluorescent post-emulsified penetrants are used.
d. ultraviolet light is used with visible dye penetrants. - ✔✔b. visible dye penetrants are
used.
✔✔The most widely accepted method for removing excessive water-washable
penetrant from the surface of a test specimen is by:
a. using a wet rag.
b. using a water spray rinse.
c. washing the part directly under water running from a tap.
d. immersing the part in water. - ✔✔b. using a water spray rinse.
✔✔Which of the following penetrant systems is generally considered the least
sensitive?
a. Water-washable; visible dye.
b. Solvent-removable; visible dye.
c. Water-washable; fluorescent dye.
d. Post-emulsified; visible dye. - ✔✔a. Water-washable; visible dye.
, ✔✔When performing a liquid penetrant test using solvent-removable visible dye
penetrant, there are several ways to remove excess penetrant form the surface of the
part. Which of the methods listed below is generally regarded as most suitable for giving
accurate test results?
a. Squirting solvent over the surface with no more than 69 kPa (10 psi) pressure.
b. Wiping with a solvent-soaked cloth, then wiping with a dry cloth.
c. Wiping with a solvent-dampened cloth, then wiping with dry cloths.
d. Wiping with dry wipes, then wiping with a solvent dampened cloth, and finally wiping
with a dry cloth. - ✔✔d. Wiping with dry wipes, then wiping with a solvent dampened
cloth, and finally wiping with a dry cloth.
✔✔A problem with retesting a specimen that has been previously tested using liquid
penetrant that is the:
a. penetrant residue left in discontinuities may not readily dissolve, and the retest may
be misleading.
b. penetrant may form beads on the surface.
c. penetrant will lose a great deal of its color brilliance.
d. added penetrant will intensify the penetrant residue, making indications larger than
normal. - ✔✔a. penetrant residue left in discontinuities may not readily dissolve, and the
retest may be misleading.
✔✔A commonly used method of checking the overall performance of a penetrant
material system is to:
a. determine the viscosity of the penetrant.
b. measure the wettability of the penetrant.
c. compare two sections of artificially cracked specimens.
d. check the penetrant contaminant levels. - ✔✔c. compare two sections of artificially
cracked specimens.
✔✔The function of emulsifier in the post-emulsified penetrant process is to:
a. more rapidly drive the penetrant into deep, tight cracks.
b. react with the surface penetrant to make the penetrant water-washable.
c. add fluorescent dye or pigment to the penetrant.
d. emulsify surface oils and grease to facilitate their removal. - ✔✔b. react with the
surface penetrant to make the penetrant water-washable.
✔✔Which of the following statements does not apply to developers used during
penetrant testing?
a. Developers are normally highly fluorescent.
b. Some developers furnish a contrasting background during inspection.
c. Developers absorb or blot the penetrant that remains in discontinuities after the
excess penetrant has been removed.
d. Nonaqueous developers are better suited for detecting fine cracks. - ✔✔a.
Developers are normally highly fluorescent.
AND ANSWERS GUARANTEE A+
✔✔Which of the following systems or components are not good candidates for leak
testing?
a. Piping and pressure vessels.
b. Refrigeration piping.
c. Vacuum chambers.
d. Sintered material components. - ✔✔d. Sintered material components.
✔✔A helium mass spectrometer is used in which of the following NDT techniques or
methods?
a. Leak testing.
b. X-ray spectroscopy.
c. Optical holography.
d. Acoustic holography. - ✔✔a. Leak testing.
✔✔Which of the following is a technique of leak testing?
a. Static.
b. Gaseous diffusion.
c. Dynamic.
d. Detector probe. - ✔✔d. Detector probe.
✔✔Potentially the most sensitive leak testing technique is the:
a. bubble test.
b. pressure change test.
c. mass spectrometer test.
d. liquid penetrate test. - ✔✔c. mass spectrometer test.
✔✔Establishing differential pressure between the test object and environment is an
essential element in which of the following NDT methods?
a. X-ray diffraction.
b. Leak testing.
c. Neutron radiography.
d. Electromagnetic testing. - ✔✔b. Leak testing.
✔✔Which of the following best describes the type of leak test used when the interior of
the test object is evacuated and a tracer gas is applied to the exterior, while the leak
detector is connected to the evacuating system?
a. Static leak test.
b. Helium leak test.
c. Dynamic leak test.
d. Halogen leak test. - ✔✔c. Dynamic leak test.
,✔✔Assuming no significant leakage, if the temperature increases, during a pressure
drop leak test, the pressure in the system under test would:
a. increase.
b. remain the same.
c. decrease.
d. first increase, then decrease to its former level. - ✔✔a. increase.
✔✔If the sensitivity of the halogen leak detector is constant throughout a test, which of
the following is true upon completion of the test?
a. No leaks smaller than a certain size have gone undetected.
b. The total leak rate of the test object is less than a certain amount.
c. The instrument and the test procedure were capable of detecting leakage of a certain
size during the test.
d. The instrument and test procedure were only capable of detecting leakage of a
certain size upstream of the tracer gas during the test. - ✔✔c. The instrument and the
test procedure were capable of detecting leakage of a certain size during the test.
✔✔All leak detection techniques are dependent upon:
a. barometric pressure
b. gas or fluid flow.
c. mass spectrometer analysis.
d. mean free paths of helium flow. - ✔✔b. gas or fluid flow.
✔✔In an evacuated system, sensitivity of a pressure change leak test is dependent not
only on the pressure change observed, but also on the degree of outgassing.
Outgassing is best defined as:
a. the release of gas from materials in a vacuum.
b. being directly proportional to the temperature of the gas.
c. the viscosity of the pressurizing gas.
d. the drop in test pressure due to leakage from the vacuum manifold. - ✔✔a. the
release of gas from materials in a vacuum.
✔✔The tendency of a liquid penetrant to enter a discontinuity is primarily related to:
a. the viscosity of the penetrant.
b. capillary forces.
c. the chemical inertness of the penetrant.
d. the specific gravity of the penetrant. - ✔✔b. capillary forces.
✔✔Liquid penetrant testing is a nondestructive method that can be used for:
a. locating and evaluating all types of discontinuities in a test specimen.
b. locating and determining the length, width, and depth of discontinuities in a test
specimen.
c. determining the tensile strength of a test specimen.
d. located discontinuities open to the surface. - ✔✔d. located discontinuities open to the
surface.
,✔✔Which of the following is not a characteristic that applies to liquid penetrant testing?
a. This method can accurately measure the depth of a crack or discontinuity.
b. This method can be used for on-site testing of large parts.
c. This method can be used to find shallow surface discontinuities.
d. This method can be made more or less sensitive by using different penetrant
materials. - ✔✔a. This method can accurately measure the depth of a crack or
discontinuity.
✔✔The property of a dye used in penetrant materials to emit light in the range of
wavelengths different from the wavelength of light that excites the emission is called:
a. emissivity.
b. irradiation.
c. spectrum blocking.
d. fluorescence. - ✔✔d. fluorescence.
✔✔When using a fluorescent, post-emulsifier penetrant, the length of time the emulsifier
is allowed to remain on the part is critical for detecting shallow discontinuities. The
optimum length of time should be:
a. 10 seconds.
b. 5 seconds.
c. 2-3 minutes.
d. determined by experimentation. - ✔✔d. determined by experimentation.
✔✔A red penetrant indication against white background is most likely to be seen when:
a. dry developers are used.
b. visible dye penetrants are used.
c. fluorescent post-emulsified penetrants are used.
d. ultraviolet light is used with visible dye penetrants. - ✔✔b. visible dye penetrants are
used.
✔✔The most widely accepted method for removing excessive water-washable
penetrant from the surface of a test specimen is by:
a. using a wet rag.
b. using a water spray rinse.
c. washing the part directly under water running from a tap.
d. immersing the part in water. - ✔✔b. using a water spray rinse.
✔✔Which of the following penetrant systems is generally considered the least
sensitive?
a. Water-washable; visible dye.
b. Solvent-removable; visible dye.
c. Water-washable; fluorescent dye.
d. Post-emulsified; visible dye. - ✔✔a. Water-washable; visible dye.
, ✔✔When performing a liquid penetrant test using solvent-removable visible dye
penetrant, there are several ways to remove excess penetrant form the surface of the
part. Which of the methods listed below is generally regarded as most suitable for giving
accurate test results?
a. Squirting solvent over the surface with no more than 69 kPa (10 psi) pressure.
b. Wiping with a solvent-soaked cloth, then wiping with a dry cloth.
c. Wiping with a solvent-dampened cloth, then wiping with dry cloths.
d. Wiping with dry wipes, then wiping with a solvent dampened cloth, and finally wiping
with a dry cloth. - ✔✔d. Wiping with dry wipes, then wiping with a solvent dampened
cloth, and finally wiping with a dry cloth.
✔✔A problem with retesting a specimen that has been previously tested using liquid
penetrant that is the:
a. penetrant residue left in discontinuities may not readily dissolve, and the retest may
be misleading.
b. penetrant may form beads on the surface.
c. penetrant will lose a great deal of its color brilliance.
d. added penetrant will intensify the penetrant residue, making indications larger than
normal. - ✔✔a. penetrant residue left in discontinuities may not readily dissolve, and the
retest may be misleading.
✔✔A commonly used method of checking the overall performance of a penetrant
material system is to:
a. determine the viscosity of the penetrant.
b. measure the wettability of the penetrant.
c. compare two sections of artificially cracked specimens.
d. check the penetrant contaminant levels. - ✔✔c. compare two sections of artificially
cracked specimens.
✔✔The function of emulsifier in the post-emulsified penetrant process is to:
a. more rapidly drive the penetrant into deep, tight cracks.
b. react with the surface penetrant to make the penetrant water-washable.
c. add fluorescent dye or pigment to the penetrant.
d. emulsify surface oils and grease to facilitate their removal. - ✔✔b. react with the
surface penetrant to make the penetrant water-washable.
✔✔Which of the following statements does not apply to developers used during
penetrant testing?
a. Developers are normally highly fluorescent.
b. Some developers furnish a contrasting background during inspection.
c. Developers absorb or blot the penetrant that remains in discontinuities after the
excess penetrant has been removed.
d. Nonaqueous developers are better suited for detecting fine cracks. - ✔✔a.
Developers are normally highly fluorescent.
