ASNT Level II NDT Technician Practice
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
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1. What is the primary physical principle that allows Liquid Penetrant Testing to
detect surface-breaking discontinuities?
A. Capillary action
B. Electromagnetic induction
C. Thermal conductivity
D. Acoustic impedance
Answer: A
Rationale: Capillary action is the fundamental principle of PT. It is the ability
of a liquid to flow into narrow spaces (like surface-breaking cracks) against
gravity, due to surface tension and adhesive forces between the liquid and
the solid surface.
2. A discontinuity that is open to the surface but is tight and filled with foreign
material may not be detected by PT. Which step in the process is most
critical for ensuring these flaws can be found?
A. Emulsification
B. Developer application
C. Pre-cleaning
D. Post-emulsification rinse
Answer: C
Rationale: Pre-cleaning is the most critical step. If a flaw is filled with oil,
, grease, or other contaminants, the penetrant cannot enter it. Proper cleaning
removes these materials, allowing the penetrant to infiltrate the flaw.
3. Which type of penetrant is formulated to be removed from the part surface
using a solvent-based remover, typically applied with a cloth or swab?
A. Water-washable penetrant
B. Solvent-removable penetrant
C. Post-emulsifiable penetrant
D. Fluorescent penetrant
Answer: B
Rationale: Solvent-removable penetrants (Method C) are designed to be
cleaned directly with a solvent. This method is often used for portability and
does not require water or emulsifiers.
4. For a fluorescent penetrant inspection, the ideal wavelength of the
ultraviolet (UV) light source is:
A. 254 nm
B. 365 nm
C. 400 nm
D. 700 nm
Answer: B
Rationale: The standard wavelength for UV-A light used in NDT is 365 nm
(long-wave UV). This wavelength excites the fluorescent dyes in the
penetrant, causing them to emit visible light (usually yellow-green).
5. The primary function of the developer in the PT process is to:
A. Clean the part after inspection
B. Act as a solvent for the penetrant
C. Draw the penetrant out of the discontinuity and spread it to form an
indication
D. Prevent corrosion of the part
Answer: C
Rationale: The developer acts like a blotter. It absorbs the penetrant trapped
, inside the flaw and draws it to the surface, spreading it out to create a larger,
more visible indication for the inspector.
6. How should a magnetic particle inspection be performed on a part that has a
suspected longitudinal crack?
A. The magnetic field should be parallel to the crack.
B. The magnetic field should be perpendicular to the crack.
C. The magnetic field should be at a 45-degree angle to the crack.
D. The direction of the magnetic field is irrelevant.
Answer: B
Rationale: For a discontinuity to be detected by MT, it must interrupt the
magnetic flux lines. This occurs most effectively when the magnetic field is
perpendicular (at right angles) to the flaw. A longitudinal crack is best
detected with a circular magnetic field.
7. Which of the following is a characteristic of a discontinuity indication found
during a magnetic particle inspection of a forged part?
A. Sharp, distinct, and narrow linear indications
B. Broad, fuzzy, and diffuse indications
C. Large, rounded, and isolated indications
D. Grid-like pattern of indications
Answer: A
Rationale: Forging defects, such as laps or seams, are often sharp and tight.
They create strong leakage fields because they are usually narrow and
oriented near the surface, producing sharp, distinct, and linear indications.
8. What is the primary purpose of using a demagnetizer after a magnetic
particle inspection?
A. To clean the part of residual magnetic particles
B. To check the sensitivity of the inspection
C. To remove the residual magnetic field that could interfere with
subsequent operations
D. To verify the direction of the magnetic field
Answer: C
, Rationale: Demagnetization is performed to remove the retained magnetic
field from the part. This is important because residual magnetism can cause
problems in subsequent machining, welding, or in moving parts (e.g.,
bearings).
9. Which of the following magnetic particle methods is the least sensitive to
the orientation of a discontinuity?
A. Longitudinal magnetization with a yoke
B. Circular magnetization with a central conductor
C. Circular magnetization with direct contact (prod) method
D. Multidirectional magnetization
Answer: D
Rationale: Multidirectional magnetization applies magnetic fields in multiple
directions simultaneously. This technique is designed to detect flaws oriented
in any direction, making it the most versatile and least dependent on flaw
orientation.
10.In Ultrasonic Testing, the acoustic property that determines the amount of
sound reflected at an interface between two materials is called:
A. Attenuation
B. Refraction
C. Acoustic impedance
D. Velocity
Answer: C
Rationale: Acoustic impedance (Z = density x velocity) is the key property. The
percentage of sound energy reflected at an interface is determined by the
difference in acoustic impedance of the two materials. A large difference
results in a strong reflection.
11.A longitudinal wave is introduced into a steel part at an angle of incidence
other than 0 degrees. What type of wave will be generated in the material if
the angle of incidence is between the first and second critical angles?
A. Longitudinal wave only
B. Shear wave only
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
1. What is the primary physical principle that allows Liquid Penetrant Testing to
detect surface-breaking discontinuities?
A. Capillary action
B. Electromagnetic induction
C. Thermal conductivity
D. Acoustic impedance
Answer: A
Rationale: Capillary action is the fundamental principle of PT. It is the ability
of a liquid to flow into narrow spaces (like surface-breaking cracks) against
gravity, due to surface tension and adhesive forces between the liquid and
the solid surface.
2. A discontinuity that is open to the surface but is tight and filled with foreign
material may not be detected by PT. Which step in the process is most
critical for ensuring these flaws can be found?
A. Emulsification
B. Developer application
C. Pre-cleaning
D. Post-emulsification rinse
Answer: C
Rationale: Pre-cleaning is the most critical step. If a flaw is filled with oil,
, grease, or other contaminants, the penetrant cannot enter it. Proper cleaning
removes these materials, allowing the penetrant to infiltrate the flaw.
3. Which type of penetrant is formulated to be removed from the part surface
using a solvent-based remover, typically applied with a cloth or swab?
A. Water-washable penetrant
B. Solvent-removable penetrant
C. Post-emulsifiable penetrant
D. Fluorescent penetrant
Answer: B
Rationale: Solvent-removable penetrants (Method C) are designed to be
cleaned directly with a solvent. This method is often used for portability and
does not require water or emulsifiers.
4. For a fluorescent penetrant inspection, the ideal wavelength of the
ultraviolet (UV) light source is:
A. 254 nm
B. 365 nm
C. 400 nm
D. 700 nm
Answer: B
Rationale: The standard wavelength for UV-A light used in NDT is 365 nm
(long-wave UV). This wavelength excites the fluorescent dyes in the
penetrant, causing them to emit visible light (usually yellow-green).
5. The primary function of the developer in the PT process is to:
A. Clean the part after inspection
B. Act as a solvent for the penetrant
C. Draw the penetrant out of the discontinuity and spread it to form an
indication
D. Prevent corrosion of the part
Answer: C
Rationale: The developer acts like a blotter. It absorbs the penetrant trapped
, inside the flaw and draws it to the surface, spreading it out to create a larger,
more visible indication for the inspector.
6. How should a magnetic particle inspection be performed on a part that has a
suspected longitudinal crack?
A. The magnetic field should be parallel to the crack.
B. The magnetic field should be perpendicular to the crack.
C. The magnetic field should be at a 45-degree angle to the crack.
D. The direction of the magnetic field is irrelevant.
Answer: B
Rationale: For a discontinuity to be detected by MT, it must interrupt the
magnetic flux lines. This occurs most effectively when the magnetic field is
perpendicular (at right angles) to the flaw. A longitudinal crack is best
detected with a circular magnetic field.
7. Which of the following is a characteristic of a discontinuity indication found
during a magnetic particle inspection of a forged part?
A. Sharp, distinct, and narrow linear indications
B. Broad, fuzzy, and diffuse indications
C. Large, rounded, and isolated indications
D. Grid-like pattern of indications
Answer: A
Rationale: Forging defects, such as laps or seams, are often sharp and tight.
They create strong leakage fields because they are usually narrow and
oriented near the surface, producing sharp, distinct, and linear indications.
8. What is the primary purpose of using a demagnetizer after a magnetic
particle inspection?
A. To clean the part of residual magnetic particles
B. To check the sensitivity of the inspection
C. To remove the residual magnetic field that could interfere with
subsequent operations
D. To verify the direction of the magnetic field
Answer: C
, Rationale: Demagnetization is performed to remove the retained magnetic
field from the part. This is important because residual magnetism can cause
problems in subsequent machining, welding, or in moving parts (e.g.,
bearings).
9. Which of the following magnetic particle methods is the least sensitive to
the orientation of a discontinuity?
A. Longitudinal magnetization with a yoke
B. Circular magnetization with a central conductor
C. Circular magnetization with direct contact (prod) method
D. Multidirectional magnetization
Answer: D
Rationale: Multidirectional magnetization applies magnetic fields in multiple
directions simultaneously. This technique is designed to detect flaws oriented
in any direction, making it the most versatile and least dependent on flaw
orientation.
10.In Ultrasonic Testing, the acoustic property that determines the amount of
sound reflected at an interface between two materials is called:
A. Attenuation
B. Refraction
C. Acoustic impedance
D. Velocity
Answer: C
Rationale: Acoustic impedance (Z = density x velocity) is the key property. The
percentage of sound energy reflected at an interface is determined by the
difference in acoustic impedance of the two materials. A large difference
results in a strong reflection.
11.A longitudinal wave is introduced into a steel part at an angle of incidence
other than 0 degrees. What type of wave will be generated in the material if
the angle of incidence is between the first and second critical angles?
A. Longitudinal wave only
B. Shear wave only
