ASNT Magnetic Particle Testing - Level III Practice Questions — 10 Free (2026)

When an MT Level II resigns from the certifying employer, what happens to the employer-issued certification under SNT-TC-1A?

• A. It stays valid until its printed expiration date.
• B. It lapses after 90 days.
• C. It is deemed revoked when the employment ends. ✓
• D. It remains valid provided the individual continues NDT work for another employer that uses similar written procedures.
• E. It transfers to ASNT for central administration.

Because certification is an act of the employer, it is deemed revoked the moment employment with that employer is terminated, regardless of any printed expiration date or subsequent work elsewhere. ASNT Level III Study Guide Basic, Chapter 2 - Recommended Practice No. SNT-TC-1A

A draft procedure submitted for your Level III approval specifies prod magnetization on the finish-machined bore of an aerospace actuator housing. Considering ASTM E709 guidance, what disposition is most appropriate?

• A. Approve it, provided the prod tips are solid copper
• B. Remove the prod technique and require a non-contact approach such as a yoke or coil ✓
• C. Approve it on condition that a wet fluorescent bath is applied at the contact points to suppress heating
• D. Approve it if the open-circuit voltage is limited to 25 volts
• E. Approve it with unrectified AC so only surface flaws respond

E709 warns that prods can arc and cause metallurgical damage and that they are inappropriate for machined surfaces and aerospace hardware, so a magnetization approach that makes no electrical contact must be substituted. ASTM E709 Section 12.3.2.1

An MT facility with a stable, well documented bath maintenance history has a Level III who proposes lengthening the wet particle contamination check from weekly to monthly. Under ASTM E1444 Table 1, this change is:

• A. Permissible when substantiated by actual technical or reliability data ✓
• B. Prohibited unless the facility converts to aerosol can suspensions
• C. Permissible with a customer verbal concurrence
• D. Permissible only after revising the practice through ASTM ballot
• E. Prohibited, because Table 1 intervals are absolute maximums that no facility may ever exceed under any circumstance whatsoever

A footnote to the process control table allows verification intervals to be shortened or lengthened when genuine technical or reliability data support the change. ASTM E1444 Table 1

For which combination of material condition and product mix is the residual magnetization technique theoretically appropriate?

• A. Annealed soft iron components whose hysteresis loops are nearly closed and which therefore retain very little magnetism after the field is removed
• B. Austenitic stainless fasteners
• C. Low carbon structural plate in small lots
• D. Heat-treated high carbon steel parts with high retentivity, produced in large quantities ✓
• E. Weld repairs on castings in the field

The technique relies on the part itself holding enough remanent flux to form indications after the current stops, which requires a retentive, hardened material; high production volumes then benefit from separating magnetization from particle application. ASNT Level III Study Guide MT Method, Chapter 8 - Magnetic Particle Testing Practices

Why does Article 7 bar a Hall effect probe gaussmeter from verifying the field in multidirectional magnetization?

• A. The probe requires contact, which the moving part prevents
• B. The rapidly alternating circuits leave no steady tangential field to read ✓
• C. The probe cannot survive the currents such power packs deliver to the part
• D. The probe reads only residual fields, never applied ones
• E. The probe is reserved by the Code for coil techniques alone

With circuits firing one after another in quick succession, adequacy is shown instead with shims or a pie indicator, covering two directions close to perpendicular with balanced strengths. ASME V Article 7 T-756.2

ISO 9934-3 organizes magnetic particle testing equipment into three broad categories. Which listing matches the scope of the standard?

• A. Alternating current machines, rectified current machines, and permanent magnet devices, classified according to the waveform of the magnetizing supply and the source of the magnetomotive force
• B. Equipment classed as portable or transportable, installations of the fixed type, and specialized testing systems built as a sequence of processing stations for continuous testing ✓
• C. Bench units, mobile packs, demagnetizers, UV sources, and field indicators
• D. Yokes, prods, and coils
• E. Manual, semiautomatic, and fully robotic machines

The scope covers portable and transportable devices, fixed installations, and specialized systems built as a line of processing stations for continuous component testing, along with the associated magnetizing, demagnetizing, illumination and measuring equipment. Classification by waveform or by automation level is not how the standard divides equipment. ISO 9934-3 Section 1

During an audit, a Level III finds that Level II examiners record every confirmed crack-like discontinuity as a 'defect' before any comparison with acceptance criteria is made. Using precise ASTM E1316 terminology, why is this practice incorrect?

• A. A discontinuity becomes a defect only after evaluation shows it fails the specified acceptance criteria ✓
• B. The term defect applies solely to subsurface conditions that cannot be sized visually
• C. Only one body, namely that part's cognizant engineering organization, gets to enter the word defect in an examination record
• D. Cracks are always defects
• E. The proper term at that stage is 'false indication' because no evaluation has yet been performed on the accumulation

In E1316 usage a defect is defined by failure against the criteria, so the label cannot be applied before the evaluation step; until then the condition is a discontinuity producing a relevant indication. ASTM E1316 Section A - Common NDT Terms

Two indications lie end to end with a small gap between them. What must a Level III establish before evaluating them?

• A. Whether the governing standard requires them to be treated as one ✓
• B. Whether the total of the two exceeds the thickness of the part wall
• C. Whether the particles used were of the same batch
• D. Whether they were produced by the same magnetizing shot
• E. Whether they both lie within the effective field length

Standards commonly join indications separated by less than a stated distance and assess them as a single one, so the gap has to be measured against that rule before either is judged on its own. ISO 23278 acceptance levels

A Level III is drafting a corporate MT procedure structure and must explain what ISO 9934-1 deliberately leaves outside its scope. Which combination is correctly excluded from ISO 9934-1?

• A. Verification of magnetization by tangential field measurement
• B. Surface preparation of coated parts
• C. Requirements for applying detection media during magnetization
• D. Acceptance criteria and the residual magnetization method ✓
• E. Interpretation of indications and the classification rules for linear versus rounded indications

The general principles part covers preparation, magnetization, media application and interpretation, but it states that acceptance criteria belong to product standards and that residual magnetization techniques are not addressed by the document. ISO 9934-1 Clause 1

What does a Level III verify about a newly delivered batch of magnetic particles?

• A. That it meets the specification the procedure names ✓
• B. That the price has not risen
• C. That the delivery note was signed by the storekeeper
• D. That its colour matches the batch used previously by the shop
• E. That the drum has not been dented in transit

Consumables are a controlled input, so the question is conformity to what the procedure calls for, not appearance or provenance. ISO 9934-2 detection media