ASNT Level II Magnetic Particle Testing
(MT) Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which fundamental physical principle forms the basis of Magnetic
Particle Testing (MT) inspection in ASNT Level II certification?
A. Sound wave reflection in solid materials
B. Magnetic flux leakage at discontinuities
C. Gamma radiation attenuation in dense materials
D. Capillary action in liquid penetrants
Magnetic Particle Testing works by magnetizing a ferromagnetic material
and detecting leakage fields that occur at surface or near-surface
discontinuities, which attract magnetic particles and form visible
indications.
2. In Magnetic Particle Testing, which materials are suitable for
inspection?
A. Non-metallic composites only
B. Austenitic stainless steels only
,C. Ferromagnetic materials such as iron and steel
D. Aluminum and copper alloys exclusively
MT is only effective on ferromagnetic materials because they can be
magnetized, allowing flux leakage to occur at discontinuities.
3. What is the primary purpose of demagnetization after MT inspection?
A. To increase surface hardness
B. To prevent interference with service performance and machining
C. To improve corrosion resistance chemically
D. To enhance weld penetration quality
Residual magnetism can interfere with machining, assembly, or service
performance, so demagnetization removes unwanted magnetic fields.
4. Which type of discontinuity is most likely to be detected using MT?
A. Subsurface porosity deep in thick castings
B. Surface or near-surface cracks
C. Internal voids in thick composites
D. Density variations in plastics
MT is highly sensitive to surface and near-surface defects where magnetic
flux leakage can occur.
5. What causes magnetic particle indications to form at a defect site?
A. Heat generated by eddy currents
B. Chemical reaction between particles and metal
C. Leakage of magnetic flux at discontinuities
D. Ultrasonic wave reflection at grain boundaries
Flux leakage creates localized magnetic fields that attract particles,
forming visible indications.
6. Which method is used to verify proper magnetization strength in MT?
, A. Radiographic film density check
B. Gauss meter or field indicator measurement
C. pH test of particle bath
D. Visual magnification only
Magnetic field strength is verified using instruments like gauss meters or
field indicators to ensure proper magnetization.
7. What is the function of a yoke in Magnetic Particle Testing?
A. To generate ultrasonic waves
B. To apply a localized magnetic field
C. To measure radiation levels
D. To clean the test surface
A yoke is a portable device that induces a magnetic field in a localized area
for inspection.
8. Which current type is commonly used for deep penetration in MT?
A. Alternating current (AC) only
B. Half-wave rectified current
C. Direct current (DC) for deeper subsurface detection
D. Audio frequency current
DC provides deeper magnetic field penetration, making it suitable for
detecting subsurface discontinuities.
9. What is a “longitudinal field” in MT?
A. A field running around the circumference of a part
B. A magnetic field parallel to the part’s length
C. A field used only in weld inspection
D. A field created by ultrasonic probes
(MT) Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which fundamental physical principle forms the basis of Magnetic
Particle Testing (MT) inspection in ASNT Level II certification?
A. Sound wave reflection in solid materials
B. Magnetic flux leakage at discontinuities
C. Gamma radiation attenuation in dense materials
D. Capillary action in liquid penetrants
Magnetic Particle Testing works by magnetizing a ferromagnetic material
and detecting leakage fields that occur at surface or near-surface
discontinuities, which attract magnetic particles and form visible
indications.
2. In Magnetic Particle Testing, which materials are suitable for
inspection?
A. Non-metallic composites only
B. Austenitic stainless steels only
,C. Ferromagnetic materials such as iron and steel
D. Aluminum and copper alloys exclusively
MT is only effective on ferromagnetic materials because they can be
magnetized, allowing flux leakage to occur at discontinuities.
3. What is the primary purpose of demagnetization after MT inspection?
A. To increase surface hardness
B. To prevent interference with service performance and machining
C. To improve corrosion resistance chemically
D. To enhance weld penetration quality
Residual magnetism can interfere with machining, assembly, or service
performance, so demagnetization removes unwanted magnetic fields.
4. Which type of discontinuity is most likely to be detected using MT?
A. Subsurface porosity deep in thick castings
B. Surface or near-surface cracks
C. Internal voids in thick composites
D. Density variations in plastics
MT is highly sensitive to surface and near-surface defects where magnetic
flux leakage can occur.
5. What causes magnetic particle indications to form at a defect site?
A. Heat generated by eddy currents
B. Chemical reaction between particles and metal
C. Leakage of magnetic flux at discontinuities
D. Ultrasonic wave reflection at grain boundaries
Flux leakage creates localized magnetic fields that attract particles,
forming visible indications.
6. Which method is used to verify proper magnetization strength in MT?
, A. Radiographic film density check
B. Gauss meter or field indicator measurement
C. pH test of particle bath
D. Visual magnification only
Magnetic field strength is verified using instruments like gauss meters or
field indicators to ensure proper magnetization.
7. What is the function of a yoke in Magnetic Particle Testing?
A. To generate ultrasonic waves
B. To apply a localized magnetic field
C. To measure radiation levels
D. To clean the test surface
A yoke is a portable device that induces a magnetic field in a localized area
for inspection.
8. Which current type is commonly used for deep penetration in MT?
A. Alternating current (AC) only
B. Half-wave rectified current
C. Direct current (DC) for deeper subsurface detection
D. Audio frequency current
DC provides deeper magnetic field penetration, making it suitable for
detecting subsurface discontinuities.
9. What is a “longitudinal field” in MT?
A. A field running around the circumference of a part
B. A magnetic field parallel to the part’s length
C. A field used only in weld inspection
D. A field created by ultrasonic probes
