Liquid Penetrant
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Liquid penentrant theory and applications
- 1.Which of the following physical properties, more than any other, determines what makesa material a good penetrant?
- A.
Viscosity
- B.
Surface tension
- C.
Wetting ability
- D.
No one single property determines if a material will or will not be a good penetrant
- 2.The speed with which a penetrant penetrates a surface flaw is influenced to the greatestextent by which of the following properties?
- A.
Density
- B.
Surface tension and wetting ability
- C.
Viscosity
- D.
Relative weight
- 3.Which of the statements below concerning the operation of the blacklight bulds of the mercuryarc type is not true?
- A.
It takes about 5 minutes for the bulb to warm up to its full output when first turned on
- B.
The lamp may go out if the line voltage drops below 90 volts
- C.
Line voltage variations above 120 volts will have little or no effect on the bulb
- D.
If for any reasons the arc is extinguished, the bulb will not immediately respond if the lamp is turned on right after it has been turned off.
- 4.Which of the items listed below is NOT an advantage of the liquid penetrant test method?
- A.
The method can find all types of discontinuties
- B.
The method is simple in principle and relatively easy to understand.
- C.
The method is essentially simple in application.
- D.
There are few limitations on the size and shape of the article that can be treated by this method.
- 5.Which of the statements below apply to the liquid penetrant method of testing?
- A.
The penetrant test method is less flexible than eddy current test method
- B.
The penetrant test method is less reliable than the magnetic particle method for finding surface defects in ferromagnetic materials.
- C.
The penetrant test method will not detect fatigue cracks.
- D.
The penetrant test method is more reliable tha radioraphic testing when attempting to detect minute surface discontinuities.
- 6.Which of the following types of discontinuities will not be detected by the liquid penetrant test method?
- A.
Surface laminations
- B.
Internal forging burst
- C.
Surface cracks
- D.
Surface laps
- 7.Which of the following discontinuities could be classified as a primary processing discontinuity often found in cast material?
- A.
Fatigue crack
- B.
Stress-corrosion
- C.
Porosity
- D.
Lack of penetration
- 8.Which of the following discontinuities could be classified as a finishing processing discontinuity?
- A.
Fatigue crack
- B.
Stress-corrosion
- C.
Lamination
- D.
Heat treat crack
- 9.Which of the following discontinuities could be classified as a service induced discontinuity?
- A.
Fatigue crack
- B.
Porosity
- C.
Machine tear
- D.
Lap
- 10.Which of the test part characteristics listed below are normally considered before the specific liquid penetrant test method is selected?
- A.
The kind and size of discontinuities most likely to occur
- B.
The intended application for the part
- C.
The surface finish of the part
- D.
All of the above
- 11.Aluminum alloy test specimens that have tested by liquid penetrant method should bethoroughly cleaned after testing because:
- A.
The acid in the penetrant may cause severe corrosion
- B.
The alkaline content of wet developer and most emulsifiers could result in surface pitting, particularly in moist atomspheres.
- C.
The toxic residue from the test will severly inhibit the application of paint on aluminum alloys
- D.
A chemical reaction between the penetrant and aluminum could cause a fire because of internal combustion.
- 12.Which of the following are typical of foreign matter which might block the opening of discontinuities if the surface of the test specimen is not properly cleaned?
- A.
Paint
- B.
Scale
- C.
Core and mold material
- D.
All of the above
- 13.Which of the following is not a recommended method of removing grease from a surface of a partto be penetrant tested?
- A.
Vapor degreasing
- B.
Aklaline cleaner
- C.
Cleaning with solvent type material
- D.
Hot water rinse
- 14.The penetrant indication of a cold shut on the surface of a casting will be:
- A.
A dotted or smooth continuous line
- B.
A cluster of small indications
- C.
A rough deep indication
- D.
A large bulbous indication
- 15.The penetrant indications of a forging lap will normally be :
- A.
A round or nearly round indication
- B.
A cluster of indications
- C.
A continuous line
- D.
A dotted line
- 16.When conducting a penetrant test , spherical indications on the surface of a part could be indicative of:
- A.
Fatigue cracks
- B.
Porosity
- C.
Weld laps
- D.
Hot tears
- 17.Which of the following is not a form in which penetrant developer is commonly available?
- A.
Dry developer
- B.
Non Aqueous developer
- C.
Wet developer
- D.
High viscosity developer
- 18.Which of the following is a possible cause for false penetrant indications?
- A.
Excessive washing
- B.
Inadequate application of developer
- C.
Penetrant or part to cold during penetration time
- D.
Lint or dirt
- 19.Pentrant residues may become entrapped under splines, fasteners, rivets, etc. Which of the following is the most likely reaction caused by such a residue.
- A.
Corrosion caused by the moisture attracted by such residues
- B.
Paint stripping
- C.
Fatigue cracking
- D.
Lattiice structure breakdown
- 20.Developer assists in the detection of penetrants retained in the discontinunities by aidingthe
- A.
Post cleaning process
- B.
Emulsification process
- C.
Bleed-out process
- D.
Drying process
- 21.Developer assists in the detection of the visible dye penetrant test method by:
- A.
Providing a clean surface
- B.
Providing a contrasting background
- C.
Providing a dry surface
- D.
Emulsifying the penetrant bleed-out
- 22.When using post-emulsification penetrants, difficulties incurred during the washing operationcan be overcome by:
- A.
Reapplying a coat of emulsifier
- B.
Increasing the water pressure used during the washing operation
- C.
Completely reprocessing the part from surface preparation on and by using a longer emulsifier time.
- D.
Dipping the part in boiling water
- 23.Which of the following methods for applying non-aqueous developer is normally consideredmost effective?
- A.
Spraying
- B.
Swabbing
- C.
Brushing
- D.
Dipping
- 24.Of the methods listed below, the most effective means of precleaning a test item prior to a penetrant test is
- A.
Vapor degreasing
- B.
Detergent cleaning
- C.
Steam cleaning
- D.
Solvent wiping
- 25.Flourescent materials used in flourescent penetrants respond most actively to radiant energy, of a wave length of approximately:
- A.
7,000 Angstroms
- B.
250 KV
- C.
3,650 Angstroms
- D.
100 foot candles
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