ASNT Liquid Penetrant Testing - Level III Practice Questions — 10 Free (2026)

For radiography of piping welds at a remote site with no electrical power, a Level III selects an Ir-192 gamma source instead of an X-ray tube chiefly because gamma equipment:

• A. allows the operator to adjust the radiation energy to match each wall thickness being examined
• B. produces sharper images
• C. needs no external power supply and is highly portable ✓
• D. always requires shorter exposure times than X-ray units
• E. presents no radiation hazard to nearby workers

A radioactive isotope emits continuously without electricity, making gamma radiography well suited to field work. Its photon energy is fixed by the isotope, it emits constantly and therefore always poses a radiation hazard, and image quality is generally not better than X-ray. ASNT Level III Study Guide Basic, Section 2 - Radiographic Testing

What governs the choice of solvent remover class for a given job?

• A. Whichever remover is cheapest at the time of purchase
• B. The classification set out in the practice ✓
• C. The size of the part
• D. The colour of the penetrant being removed from the part
• E. The preference of the operator on the shift

The practice divides removers into classes with different properties, and the class is a specified variable rather than a matter of what the store has in stock. ASTM E1417 Section 5.3

A run of nonmetallic components is attacked by oil based penetrant and by the emulsifier now in the tanks, yet the parts still have to be examined. Which change does the handbook support?

• A. Move to a water base penetrant system chosen for compatibility with the component material ✓
• B. Raise the dwell and stay with the oil based system
• C. Keep the oil based penetrant but switch to a nonaqueous coating
• D. Stay with the present materials and add a vapour degreasing step after examination so any absorbed penetrant is driven back out of the component
• E. Switch to an oil based emulsifier route at a lower sensitivity grade to cut the exposure time

Compatibility with the part outranks sensitivity in the selection order, and where the carrier itself damages the component the carrier has to change. ASNT NDT Handbook Vol 2 PT, Chapter 1 - Test Part Material

Why does a Level III check family compatibility when specifying penetrant materials?

• A. To simplify ordering
• B. Because different families require different developers only
• C. Because mixed families cost more to purchase
• D. Because materials are qualified as a system, not singly ✓
• E. Because the shelf life differs between manufacturers

Penetrant, remover, emulsifier and developer are proven to work together, and taking one component from elsewhere leaves the combination unqualified. ASME V Article 6 T-654

Why should developer be taken off parts promptly once the examination is finished?

• A. To keep the ambient light reading below 2 fc
• B. Because it becomes harder to remove the longer it stays on the part ✓
• C. To restore the fluorescent brightness
• D. Because the developer will otherwise absorb moisture and change the concentration of the aqueous developer bath at the next station
• E. To recover the developer powder for reuse

Delay lets the coating bond to the surface, which turns a simple rinse into a much harder cleaning job. ASTM E165 Section 8.10

A pipeline crew must examine girth welds outdoors at about 2 deg C. Which part of the ISO 3452 series carries the special requirements?

• A. The general principles part alone, 2 deg C being above freezing
• B. The part written for work below 10 deg C ✓
• C. The reference block part
• D. The part written for work above 50 deg C
• E. The equipment part

Anything colder than ten degrees Celsius falls to the low temperature part, which likewise admits only consumables qualified for that band. ISO 3452-6 Clause 1

A refinery asks for penetrant examination of a nozzle whose wall is still sitting near 90 deg C. Which condition decides whether the crew may proceed under the elevated temperature part of the ISO 3452 series?

• A. Work may start once the nozzle is shaded from direct sun
• B. Clearance rests on the welder holding a current qualification
• C. Any Type I penetrant in the vehicle will serve, provided the dwell period is cut back to suit the heat of the wall
• D. The consumables in the crew's kit carry a qualification covering the band that 90 deg C falls inside ✓
• E. The crew may proceed as soon as heat resistant gloves are issued

That part governs work above fifty degrees Celsius and admits only consumables carrying a qualification for the band containing the working temperature, used as the maker directs. ISO 3452-5 Clause 1

A production batch of aerosol packed developer is offered for release. How are containers drawn from that batch for the required tests?

• A. The first, a middle and the last container are tested ✓
• B. Three containers taken at random from the pallet
• C. Every tenth container until the batch is exhausted
• D. Only one container, drawn from the middle of the filling run
• E. The first and last containers only, with sulfur and halogen content determined on both of them and the two figures averaged for the record

Taking containers from the beginning, middle and end of a filling run catches drift in the fill itself, which random picking may miss. The chemical contaminant determination is costly and destructive, so a single container carries it. ISO 3452-2 Sections 5.4.5 and 6.12

Why does a Level III record the acceptance level chosen from ISO 23277 on the procedure?

• A. Because the level sets the dwell time to be used
• B. Because the level determines which penetrant manufacturer must be selected
• C. Because the level fixes the developer form for the examination
• D. Because the levels differ in strictness and the choice must be traceable ✓
• E. Because auditors count the levels

The same indication passes under one level and fails under another, so a report that does not say which was applied cannot be checked by anyone later. ISO 23277 acceptance levels

A Level III sets up a fluorescent viewing booth and must cap the stray white light reaching the surface under examination. Which ceiling belongs in the procedure?

• A. 10 lx (1 fc)
• B. 20 lx (2 fc) ✓
• C. 50 lx (5 fc)
• D. 100 lx (10 fc)
• E. 200 lx (20 fc)

Brightness contrast collapses as stray light raises the apparent luminance of the background, so the ambient level must be held very low while ultraviolet irradiance is held high. Both quantities are measured at the surface, not at the lamp. ASNT Level III Study Guide PT, Chapter 4 - Fluorescent Viewing Conditions