Liquid penetrant questions with complete
solutions 2025.
A penetrant inspection cannot find - ANSWER: An internal cavity
When applying penetrant by dipping, heating the penetrant prior to dipping - ANSWER: Is not
generally recommended
Which of the following is not a function of developers used in penetrant testing - ANSWER: To
add fluorescence to penetrants
Which of the following could be a source of false indications on a test specimen - ANSWER: 1.
Penetrant on the test table
2. Penetrant on the hands of the inspector
3. Contamination of dry or wet developer with penetrant
When using a post emulsification penetrant, it is necessary to apply the emulsifier - ANSWER:
After the dwell time has elapsed
When using solvent removable penetrates, the excess penetration may be removed by -
ANSWER: Wiping the part with a rag or cloth that has been damaged with solvent
Before conduction a liquid penetrant test, it is important to ensure the surface of the port is free
of - ANSWER: 1. Oil and grease
2. Acids and chromates
3. Traces of water
The purpose of using a developer on a test specimen is to - ANSWER: Absorb penetrate from
discontinuities and to provide a contrasting background
Which of the following is generally excepted as the most important precaution when using water
washable penetrates - ANSWER: Avoid over rinsing the part
, A good penetrant must do all of the following except - ANSWER: Evaporate very rapidly
Which of the following statements is not true - ANSWER: It is not necessary to remove a film of
oil from a port prior to the penetrant testing because the penetrant is basically in oil
The time allowed for the penetrant to enter discontinuities which may be present is the -
ANSWER: Dwell time
Which of the following is an advantage of visible die penetrance over fluorescent penetrants -
ANSWER: Visible die penetrantsdo not require black light
When conduction a liquid penetrant test using a post emulsifiable visible die penetrant, the
generally excepted method for applying the web developer is by - ANSWER: Spraying
Excess penetrant ( all penetrant except that which is in discontinuities) is removed from the
specimen - ANSWER: After the required penetrant dwell time has elapsed
The first step in conducting a liquid penetrant test on a surface that has been painted is to -
ANSWER: Completely remove the paint
Which of the following is not a property of a developer used in liquid penetrant dye testing -
ANSWER: The material must be fluorescent if used with fluorescent penetrants
Which of the following types of discontinuities would not be detectable by liquid penetrant
examination - ANSWER: Subsurface porosity
The most common type of contaminate and fluorescent penetrant fluid is - ANSWER: Water
The contamination of a water washable penetrant with an excessive amount of water will -
ANSWER: Reduce the penetrating quality of the penetrant; adversely affect the wash ability of
the penetrant
Which of the following is not a generally excepted method for cleaning parts prior to penetrant
testing - ANSWER: Wire brushing
Which of the following discontinuities is most likely to be missed due to improper rinse
techniques - ANSWER: Shallow and broad discontinuities
The term used to defined the period of time in which the test part is covered with penetrant is -
ANSWER: Penetration time (dwell time)
When removing excess penetrant from the surface of a test specimen - ANSWER: 1. The
penetrant removal operation must not remove the penetrant from discontinuities
solutions 2025.
A penetrant inspection cannot find - ANSWER: An internal cavity
When applying penetrant by dipping, heating the penetrant prior to dipping - ANSWER: Is not
generally recommended
Which of the following is not a function of developers used in penetrant testing - ANSWER: To
add fluorescence to penetrants
Which of the following could be a source of false indications on a test specimen - ANSWER: 1.
Penetrant on the test table
2. Penetrant on the hands of the inspector
3. Contamination of dry or wet developer with penetrant
When using a post emulsification penetrant, it is necessary to apply the emulsifier - ANSWER:
After the dwell time has elapsed
When using solvent removable penetrates, the excess penetration may be removed by -
ANSWER: Wiping the part with a rag or cloth that has been damaged with solvent
Before conduction a liquid penetrant test, it is important to ensure the surface of the port is free
of - ANSWER: 1. Oil and grease
2. Acids and chromates
3. Traces of water
The purpose of using a developer on a test specimen is to - ANSWER: Absorb penetrate from
discontinuities and to provide a contrasting background
Which of the following is generally excepted as the most important precaution when using water
washable penetrates - ANSWER: Avoid over rinsing the part
, A good penetrant must do all of the following except - ANSWER: Evaporate very rapidly
Which of the following statements is not true - ANSWER: It is not necessary to remove a film of
oil from a port prior to the penetrant testing because the penetrant is basically in oil
The time allowed for the penetrant to enter discontinuities which may be present is the -
ANSWER: Dwell time
Which of the following is an advantage of visible die penetrance over fluorescent penetrants -
ANSWER: Visible die penetrantsdo not require black light
When conduction a liquid penetrant test using a post emulsifiable visible die penetrant, the
generally excepted method for applying the web developer is by - ANSWER: Spraying
Excess penetrant ( all penetrant except that which is in discontinuities) is removed from the
specimen - ANSWER: After the required penetrant dwell time has elapsed
The first step in conducting a liquid penetrant test on a surface that has been painted is to -
ANSWER: Completely remove the paint
Which of the following is not a property of a developer used in liquid penetrant dye testing -
ANSWER: The material must be fluorescent if used with fluorescent penetrants
Which of the following types of discontinuities would not be detectable by liquid penetrant
examination - ANSWER: Subsurface porosity
The most common type of contaminate and fluorescent penetrant fluid is - ANSWER: Water
The contamination of a water washable penetrant with an excessive amount of water will -
ANSWER: Reduce the penetrating quality of the penetrant; adversely affect the wash ability of
the penetrant
Which of the following is not a generally excepted method for cleaning parts prior to penetrant
testing - ANSWER: Wire brushing
Which of the following discontinuities is most likely to be missed due to improper rinse
techniques - ANSWER: Shallow and broad discontinuities
The term used to defined the period of time in which the test part is covered with penetrant is -
ANSWER: Penetration time (dwell time)
When removing excess penetrant from the surface of a test specimen - ANSWER: 1. The
penetrant removal operation must not remove the penetrant from discontinuities
