What Is Liquid Penetrate? Know About This Nde Methord

76 Questions | By Ndtputz | Updated: Mar 22, 2022 | Attempts: 4392

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What Is Liquid Penetrate? Know About This Nde Methord - Quiz

Dye penetrant inspection, also called liquid penetrate inspection or penetrant testing, is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials.

Questions and Answers

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