CWB Level 2 NDT Exam 2025 – Study Guide
& Practice Questions REAL EXAM!!!
Liquid Penetrant Testing Steps - ANSWER ✔---1) clean/dry surface
2) apply penetrant
3) dwell time
4) remove excess penetrant
5) apply developer
6) inspection
Small contact angle meANSWER - ANSWER ✔---The liquid "wets" into the solid
Large angle meANSWER poor wetting
Contact angle for a liquid can be reduced by adding - ANSWER ✔---A detergent (surfactant)
Titanium, Nickel alloys can be harmed by - ANSWER ✔---Halogens (chlorides, sulphur)
Three methods for removing excess penetrant - ANSWER ✔---1) water washing
2) post emulsifier
3) solvent
ASTM E-165 Standard Test Method for LPI classifies methods of LPI by: - ANSWER ✔---1) type of dye
2) method of penetrant removal
3) type of developer
2 types of dye are - ANSWER ✔---Visible and fluorescent
, Post emulsified penetrants require - ANSWER ✔---Emulsifying agent to make them water washable
Lipophilic and Hydrophilic
Used with fluorescent dye
Solvent removable penetrants utilize - ANSWER ✔---Volatile organic solvents
Dry quickly before the application of developer
Good for limited portability parts
Welds are most commonly examined using - ANSWER ✔---Colour contract , solvent removable
method
Types of developers - ANSWER ✔---Aqueous
Non-aqueous
Water soluble
Water suspendable
Dry powder developers are - ANSWER ✔---Light free flowing powders
Only used with fluorescent penetrants
Applied with powder gun, electrostatic spray or dust storm cabinet
Non aqueous developers are - ANSWER ✔---Developer particles suspended in volatile organic
solvent
Used with solvent removal process (spot checking welds)
Must be thoroughly agitated
White when dry (contrast for penetrant)
Water soluble and water suspended developers are supplied as - ANSWER ✔---Powders to be mixed
in water at specific concentrations
UV light energy is - ANSWER ✔---Invisible to the eye
Range of 330-390 nanometers
Dye is Yellow Green appearance when exposed
Fluorescent Post emulsified penetrant used for - ANSWER ✔---High sensitivity applications -
detection of fatigue cracks
Water washable penetrant used for - ANSWER ✔---Surface porosity, rough surfaces
Solvent removable with visible dye used for - ANSWER ✔---Most weld inspections in normal
fabrication where portability is necessary
& Practice Questions REAL EXAM!!!
Liquid Penetrant Testing Steps - ANSWER ✔---1) clean/dry surface
2) apply penetrant
3) dwell time
4) remove excess penetrant
5) apply developer
6) inspection
Small contact angle meANSWER - ANSWER ✔---The liquid "wets" into the solid
Large angle meANSWER poor wetting
Contact angle for a liquid can be reduced by adding - ANSWER ✔---A detergent (surfactant)
Titanium, Nickel alloys can be harmed by - ANSWER ✔---Halogens (chlorides, sulphur)
Three methods for removing excess penetrant - ANSWER ✔---1) water washing
2) post emulsifier
3) solvent
ASTM E-165 Standard Test Method for LPI classifies methods of LPI by: - ANSWER ✔---1) type of dye
2) method of penetrant removal
3) type of developer
2 types of dye are - ANSWER ✔---Visible and fluorescent
, Post emulsified penetrants require - ANSWER ✔---Emulsifying agent to make them water washable
Lipophilic and Hydrophilic
Used with fluorescent dye
Solvent removable penetrants utilize - ANSWER ✔---Volatile organic solvents
Dry quickly before the application of developer
Good for limited portability parts
Welds are most commonly examined using - ANSWER ✔---Colour contract , solvent removable
method
Types of developers - ANSWER ✔---Aqueous
Non-aqueous
Water soluble
Water suspendable
Dry powder developers are - ANSWER ✔---Light free flowing powders
Only used with fluorescent penetrants
Applied with powder gun, electrostatic spray or dust storm cabinet
Non aqueous developers are - ANSWER ✔---Developer particles suspended in volatile organic
solvent
Used with solvent removal process (spot checking welds)
Must be thoroughly agitated
White when dry (contrast for penetrant)
Water soluble and water suspended developers are supplied as - ANSWER ✔---Powders to be mixed
in water at specific concentrations
UV light energy is - ANSWER ✔---Invisible to the eye
Range of 330-390 nanometers
Dye is Yellow Green appearance when exposed
Fluorescent Post emulsified penetrant used for - ANSWER ✔---High sensitivity applications -
detection of fatigue cracks
Water washable penetrant used for - ANSWER ✔---Surface porosity, rough surfaces
Solvent removable with visible dye used for - ANSWER ✔---Most weld inspections in normal
fabrication where portability is necessary
