Magnetic Particle Testing Technician
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary purpose of magnetic particle testing (MT)?
A. To measure material hardness
B. To detect surface and near-surface discontinuities in ferromagnetic materials
C. To determine chemical composition
D. To measure electrical conductivity
Answer: To detect surface and near-surface discontinuities in ferromagnetic
materials
Rationale: MT uses magnetic fields and magnetic particles to reveal
discontinuities that disturb the magnetic field, particularly surface and shallow
subsurface flaws in ferromagnetic materials.
2. Which materials are generally suitable for magnetic particle testing?
A. Aluminum alloys
B. Copper alloys
C. Ferromagnetic materials
D. Glass
Answer: Ferromagnetic materials
,Rationale: MT requires a material capable of being magnetized. Ferromagnetic
materials such as iron, carbon steel, and many nickel and cobalt alloys are
suitable.
3. Which type of discontinuity is most readily detected by magnetic particle
testing?
A. Deep internal porosity
B. Surface-breaking crack
C. Chemical segregation
D. Internal inclusions several inches deep
Answer: Surface-breaking crack
Rationale: Surface-breaking cracks produce strong leakage fields at the material
surface and are therefore highly detectable by MT.
4. What causes magnetic flux leakage?
A. Uniform magnetic permeability
B. A discontinuity that interrupts or distorts the magnetic field
C. Excessive cleaning
D. Low particle concentration alone
Answer: A discontinuity that interrupts or distorts the magnetic field
Rationale: When a discontinuity interrupts the magnetic path, magnetic flux is
forced out of the material, creating a leakage field that attracts magnetic
particles.
5. Which orientation of a crack provides the strongest indication?
A. Crack parallel to the magnetic field
B. Crack approximately perpendicular to the magnetic field
C. Crack at any orientation equally
D. Crack parallel to the part surface only
Answer: Crack approximately perpendicular to the magnetic field
,Rationale: Discontinuities that cross magnetic flux lines cause greater flux
leakage and generally produce stronger particle indications.
6. What is the main difference between visible and fluorescent magnetic
particles?
A. Visible particles require ultraviolet light
B. Fluorescent particles are viewed under suitable ultraviolet or blue-light
conditions
C. Visible particles cannot detect cracks
D. Fluorescent particles are used only on nonmagnetic materials
Answer: Fluorescent particles are viewed under suitable ultraviolet or blue-light
conditions
Rationale: Fluorescent particles emit visible light when appropriately
illuminated, providing high contrast and sensitivity in controlled inspection
environments.
7. What is the purpose of applying magnetic particles during MT?
A. To harden the component
B. To coat the component permanently
C. To accumulate at magnetic flux leakage fields and form indications
D. To remove surface contamination
Answer: To accumulate at magnetic flux leakage fields and form indications
Rationale: Magnetic particles are attracted to leakage fields associated with
discontinuities, making otherwise difficult-to-see flaws visible.
8. Which magnetizing technique produces a longitudinal magnetic field?
A. Direct contact current
B. Head shot
C. Coil magnetization
D. Prod technique
, Answer: Coil magnetization
Rationale: A coil produces a magnetic field generally longitudinal to the
component when the component is positioned appropriately within the coil.
9. A head-shot technique primarily produces what type of magnetic field?
A. Longitudinal
B. Circular
C. Radial
D. Random
Answer: Circular
Rationale: Current passed through a conductive component produces a circular
magnetic field around the current path.
10.What is a major advantage of fluorescent MT?
A. It eliminates the need for magnetization
B. It can provide high sensitivity through strong visual contrast
C. It works on all metals
D. It detects only deep internal defects
Answer: It can provide high sensitivity through strong visual contrast
Rationale: Fluorescent indications can be highly conspicuous against a dark
background when proper illumination and viewing conditions are maintained.
11.What is the purpose of demagnetizing a component after MT?
A. Increase its residual magnetism
B. Remove or reduce residual magnetism that could interfere with service or
subsequent operations
C. Increase its hardness
D. Improve its electrical insulation
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary purpose of magnetic particle testing (MT)?
A. To measure material hardness
B. To detect surface and near-surface discontinuities in ferromagnetic materials
C. To determine chemical composition
D. To measure electrical conductivity
Answer: To detect surface and near-surface discontinuities in ferromagnetic
materials
Rationale: MT uses magnetic fields and magnetic particles to reveal
discontinuities that disturb the magnetic field, particularly surface and shallow
subsurface flaws in ferromagnetic materials.
2. Which materials are generally suitable for magnetic particle testing?
A. Aluminum alloys
B. Copper alloys
C. Ferromagnetic materials
D. Glass
Answer: Ferromagnetic materials
,Rationale: MT requires a material capable of being magnetized. Ferromagnetic
materials such as iron, carbon steel, and many nickel and cobalt alloys are
suitable.
3. Which type of discontinuity is most readily detected by magnetic particle
testing?
A. Deep internal porosity
B. Surface-breaking crack
C. Chemical segregation
D. Internal inclusions several inches deep
Answer: Surface-breaking crack
Rationale: Surface-breaking cracks produce strong leakage fields at the material
surface and are therefore highly detectable by MT.
4. What causes magnetic flux leakage?
A. Uniform magnetic permeability
B. A discontinuity that interrupts or distorts the magnetic field
C. Excessive cleaning
D. Low particle concentration alone
Answer: A discontinuity that interrupts or distorts the magnetic field
Rationale: When a discontinuity interrupts the magnetic path, magnetic flux is
forced out of the material, creating a leakage field that attracts magnetic
particles.
5. Which orientation of a crack provides the strongest indication?
A. Crack parallel to the magnetic field
B. Crack approximately perpendicular to the magnetic field
C. Crack at any orientation equally
D. Crack parallel to the part surface only
Answer: Crack approximately perpendicular to the magnetic field
,Rationale: Discontinuities that cross magnetic flux lines cause greater flux
leakage and generally produce stronger particle indications.
6. What is the main difference between visible and fluorescent magnetic
particles?
A. Visible particles require ultraviolet light
B. Fluorescent particles are viewed under suitable ultraviolet or blue-light
conditions
C. Visible particles cannot detect cracks
D. Fluorescent particles are used only on nonmagnetic materials
Answer: Fluorescent particles are viewed under suitable ultraviolet or blue-light
conditions
Rationale: Fluorescent particles emit visible light when appropriately
illuminated, providing high contrast and sensitivity in controlled inspection
environments.
7. What is the purpose of applying magnetic particles during MT?
A. To harden the component
B. To coat the component permanently
C. To accumulate at magnetic flux leakage fields and form indications
D. To remove surface contamination
Answer: To accumulate at magnetic flux leakage fields and form indications
Rationale: Magnetic particles are attracted to leakage fields associated with
discontinuities, making otherwise difficult-to-see flaws visible.
8. Which magnetizing technique produces a longitudinal magnetic field?
A. Direct contact current
B. Head shot
C. Coil magnetization
D. Prod technique
, Answer: Coil magnetization
Rationale: A coil produces a magnetic field generally longitudinal to the
component when the component is positioned appropriately within the coil.
9. A head-shot technique primarily produces what type of magnetic field?
A. Longitudinal
B. Circular
C. Radial
D. Random
Answer: Circular
Rationale: Current passed through a conductive component produces a circular
magnetic field around the current path.
10.What is a major advantage of fluorescent MT?
A. It eliminates the need for magnetization
B. It can provide high sensitivity through strong visual contrast
C. It works on all metals
D. It detects only deep internal defects
Answer: It can provide high sensitivity through strong visual contrast
Rationale: Fluorescent indications can be highly conspicuous against a dark
background when proper illumination and viewing conditions are maintained.
11.What is the purpose of demagnetizing a component after MT?
A. Increase its residual magnetism
B. Remove or reduce residual magnetism that could interfere with service or
subsequent operations
C. Increase its hardness
D. Improve its electrical insulation
