ASNT Liquid Penetrant Testing - Level I & II Practice Questions — 10 Free (2026)

A shop proposes to drop its weekly laboratory checks of in-use penetrant chemistry because a monitor panel is run every shift. Why is this unacceptable?

• A. Monitor panels may only be run monthly
• B. The panel checks equipment but never responds to changes in the chemical materials themselves
• C. Laboratory checks are needed solely to satisfy customer paperwork and add no technical value, so both practices are optional if a written procedure says so
• D. Panels expire after ten uses
• E. The panel flags only sudden major shifts and does not substitute for periodic material and equipment checks ✓

Routine panel runs complement rather than replace the scheduled examination of penetrant chemistry, gages, nozzles and other hardware, because gradual deterioration escapes the panel. NDT Handbook Vol 2, Chapter 8 Part 3 - Limitations of the System Monitor Panel

When interpreting weekly refractometer readings from a hydrophilic remover bath, what should the readings be compared against to establish the true bath concentration?

• A. Readings taken from the lipophilic emulsifier used elsewhere in the facility
• B. A fixed conversion table published in the standard
• C. Values measured from prepared solutions of known emulsifier concentration ✓
• D. The nominal value stamped on the refractometer body
• E. The refractive index printed on the water supply certificate

A curve built from known concentrations of the same product converts refractive index into bath strength; no universal table covers every emulsifier. ASTM E1417 Section 7.8.2.6

Broad, shallow discontinuities are suspected on a machined component. Why is a water washable penetrant a questionable choice for this job?

• A. Rinsing can strip penetrant back out of shallow surface entrapments ✓
• B. The dye cannot enter wide shallow openings
• C. Water reacts with the dye and bleaches it before the developer can be applied, so contrast is permanently destroyed
• D. Shallow flaws always require visible dye
• E. Dwell time would become far too long

Because the emulsifying agent is built into a water washable penetrant, the rinse acts on penetrant everywhere, including inside broad shallow flaws, so overwashing can remove the very entrapments being sought. ASNT PT Level II Study Guide, Chapter 2 - Water Washable Method

An open dip tank of hydrophilic emulsifier is in daily use. How does ASTM E165 expect its concentration to be controlled?

• A. Verified only when the bath is first mixed
• B. Tracked continuously with a conductivity probe
• C. Determined monthly by titrating a bath sample against a standard solution in the laboratory
• D. Judged by the color of the bath each shift
• E. Checked every week with a suitable refractometer ✓

Water-base removers are diluted concentrates whose strength drifts with use and evaporation, so a weekly refractometer reading keeps the removal action consistent. ASTM E165 Section 7.3.2.1

A part must be examined at 150 deg F. What does Article 6 require?

• A. The work may proceed once a visible dye replaces the fluorescent penetrant
• B. The work may proceed if dwell time is doubled to suit the heat
• C. The work is prohibited outright at any temperature above the standard band
• D. The work may proceed if the surface is cooled with forced air while dwelling continues
• E. The materials and processing must be qualified through Mandatory Appendix III ✓

Stepping outside the standard band is permitted, but only after the proposed temperature has been qualified by the comparator block route that appendix lays down. ASME V Article 6 T-653

In ASTM E1316 penetrant terminology, the portion of the dwell period during which excess penetrant or emulsifier runs off the part is defined as the:

• A. rinse time
• B. wash
• C. drain time ✓
• D. development interval
• E. drying time

Drain time is a defined slice of the dwell period; drying time refers to a cleaned, rinsed, or wet-developed part losing its moisture, and wash means removal with another liquid. ASTM E1316 Section F - Liquid Penetrant Testing Terms

At the emulsifier station of a fixed line, which application technique does ISO 3452-4 permit for a lipophilic emulsifier?

• A. Brushing it over the penetrant covered surface, working it in until the background fluorescence disappears completely
• B. Flow-on application from a hose
• C. Foam application
• D. Dilute spray application
• E. Immersion of the whole component for a controlled time, followed by draining ✓

Because a lipophilic emulsifier starts diffusing into penetrant on contact and cannot be agitated or scrubbed, dipping with timed drainage is the only sanctioned technique; foam and flow-on are reserved for hydrophilic products. ISO 3452-4 Section 5.5.3

Under ISO 3452-2, how is the sensitivity of each new production batch of a penetrant product verified?

• A. By a full requalification on all four panel thicknesses of the type 1 reference block
• B. By checking it side by side against the retained sample approved earlier ✓
• C. By the customer's incoming inspection department
• D. By a fluorimeter reading alone
• E. By an independent ISO/IEC 17025 laboratory on every batch

Type testing happens once at an independent laboratory; each later batch only needs to match the sample retained from the approved material. ISO 3452-2 Clause 5.4.1

A test report cites the product family designation ISO 3452-2 IAa Level 2. What does the middle character of the code IAa indicate about the process?

• A. A solvent wipe removes the excess
• B. The developer is applied in dry powder form
• C. A lipophilic emulsifier is used for removal
• D. Water is used to remove the excess penetrant ✓
• E. A hydrophilic emulsifier is applied after a water pre-wash

Within the family code the first character gives the penetrant type, the second the removal method and the third the developer form; here the removal method is plain water. ISO 3452-1 Clause 6.4 and Table 1

A product set is marked ICa-2/M in accordance with ISO 3452-5. What does the temperature suffix M convey?

• A. The remover is a methanol based product
• B. The products are qualified for use from 50 deg C up to 100 deg C ✓
• C. The products are qualified for 100 deg C to 200 deg C, proven at three separate test points
• D. The working range was set by the manufacturer between declared limits
• E. The system has a medium sensitivity rating

A temperature suffix added after the sensitivity level shows the qualified hot range; the medium rating spans 50 deg C to 100 deg C with test points at both range limits. ISO 3452-5 Clauses 7 and 12, Table 1