Posted by: novembri yusuf | October 23, 2008


Di bawah ini saya sisipkan beberapa contoh soal soal ujian Liquid Penetrant Test NDT. Semoga contoh soal  ini bias membantu.. 





If the surface of the part has been machined, sanded or grit blasted:


The part may also require etching
It can be immersed in penetrant for its entire dwell time
It will require a shorter dwell time
It will need to be heated in order to open any cracks that have been peened over






Which of the following is a disadvantage of LPI?


Only surface breaking flaws can be detected
Surface finish and roughness can affect inspection sensitivity
Post cleaning is required
All of the above






The advantage that liquid penetrant testing has over an unaided visual inspection is that:


The actual size of the discontinuity can be measured
The depth of the defect can be measured
The cause of the impact can be seen
It makes defects easier to see for the inspector






Which method of penetrant removal is post emulsified, hydrophilic?


Method A
Method B
Method C
Method D






LPI can be used to test most materials provided the surface of the part is:


Heated to a temperature above 100o F
Is not extremely rough or porous
Smooth and uniform
Cleaned with number 005 grit






Which of the following is an advantage to LPI?


Large areas can be inspected
Parts with complex shapes can be inspected
It is portable
All of the above is an advantage






Which type of penetrant is less vulnerable to contamination from cleaning fluid?


Type I
Type II
Type III
Type IV






When the excess penetrant is removed from the surface of the part, a course water spray should be directed at an angle of:


20 degrees
45 degrees
90 degrees
It does not matter what angle the spray is applied








Developers come in a variety of forms and can be applied by:


All of the above






Minimum penetrant dwell times are usually:


1-5 minutes
1-30 minutes
5-60 minutes
60-100 minutes






Which penetrant method is easiest to use in the field?


Fluorescent, post-emulsifiable
Visible dye, water washable
Visible dye, solvent removable
Fluorescent, water washable






Which level of penetrant is the most sensitive?


Level I
Level II
Level III
Level IV






Developer is required to:


Draw out the penetrant from the discontinuity
Provide contrast between the penetrant and the parts background color
Increase the pentrants fluorescence
Both A and B






Large defects can be hidden under a paint surface because:


The paint will fill in the cracks and change the fluorescence of the penetrant
Paint is more elastic than metal and will not fracture
The penetrant will adhere to the paint resulting in maximum fluorescence
All of the above apply






Penetrants are designed to:


Perform equally
Perform the same no matter who manufacturers them
Shift in grade and value when the temperature changes
Remain fluid so it can be drawn back to the surface of the part






The pentrants that are used to detect the smallest defects:


Should only be used on aerospace parts
Will also produce the largest amount of irrelevant indications
Can only be used on small parts less than 10 inches in surface area
Should not be used in the field






How often should the UV light intensity be performed?


When a new bulb is installed
At startup of inspection cycle
Every 8 hours
All of the above






White light intensity at the surface of the part when using fluorescent penetrant should be:


A minimum of 100 foot-candles
A maximum of 100 foot-candles
A minimum of 50 foot-candles
A maximum of 2 foot-candles






Penetrant can be applied by:


All of the above






What industry and military specifications control a penetrants?


Flash point
All of the above



  1. Pak Novembri Yusuf,
    May I answer your question Liquid Penetrant,please…just try…
    1. A D D D B
    6. D C B D C
    11. C D D D D
    16. B D D D D
    What the result….?

  2. terimakasih. sangat menambah ilmu

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