Liquid Penetrant

76 Questions | Total Attempts: 2942

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Liquid Quizzes & Trivia

Liquid penentrant theory and applications


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