NDT Penetrant Testing 4

Question 1

Which penetrant testing method uses Method C classification?

Accepted Answer

Solvent-removable penetrant

Answer

Per ASTM E1417, Method C refers to solvent-removable penetrants where excess penetrant is removed using a solvent-dampened cloth.

Question 2

Which discontinuity type is penetrant testing LEAST effective at detecting?

Accepted Answer

Very wide open discontinuities

Answer

Very wide open discontinuities may not retain enough penetrant through the cleaning step to produce a detectable indication.

Question 3

What is the purpose of the pre-cleaning step before applying penetrant?

Accepted Answer

To remove contaminants that could block discontinuity openings or cause false indications

Answer

Pre-cleaning removes oils, paint, rust, and other contaminants that could seal discontinuity openings and prevent penetrant entry or cause false indications.

Question 4

A technician is inspecting an austenitic stainless steel weld. Which penetrant specification controls sulfur and halogen content to prevent material damage?

Accepted Answer

AMS 2644

Answer

AMS 2644 specifies limits on sulfur and halogen content in penetrant materials used on nickel alloys and austenitic stainless steels to prevent stress corrosion cracking.

Question 5

What type of crack is typically found in aluminum castings and is commonly detected by PT?

Accepted Answer

Hot tears

Answer

Hot tears form in castings during solidification when thermal stresses exceed the strength of the partially solidified metal and are readily detected by PT.

NDT - Non-Destructive Testing Practice Test

NDT - Non-Destructive Testing Practice Test

NDT Penetrant Testing 4