Liquid Penetrant Inspection 50 Question

Quiz

 ID CODE      DEPARTMENT    

1 The total time that the penetrant is in contact with the part surface is called the:

 Soak time Baking time Dwell time Immersion time

2 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

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

 Dusting Dipping Spraying All of the above

4 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

5 Which method of penetrant removal is post emulsified, lipophilic?

 Method A Method B Method C Method D

6 Which emulsifier is most sensitive to contact time when applied to the parts surface?

 Hydrophilic emulsifier Lipophilic emulsifier Fluorescent emulsifier Visible dye emulsifier

7 What is the optimal temperature of penetrant materials and the part under inspection in order to obtain the best results?

 50 to 80o F 80 to 120o F 35 to 100o F 80 to 100o F

8 Which method of penetrant removal is post emulsified, hydrophilic?

 Method A Method B Method C Method D

Contamination of the penetrant:

9

 Will only take place if the part has not been cleaned Will occur because of the crossover between the penetrant

and developer Will occur if the tank is not covered during the dwell time Will change the surface tension and contact angle

10 Developers are used to:

 Make the penetrant fluoresce Reduce the dwell time Pull trapped penetrant material out of the defect All of the above

11 Black lights should:

 Only be used with a Franklin filter Only be used with Type II penetrants Never be used with a cracked filter Never be used with Knoop filters

12 Most specifications limit water contamination to around:

 1 percent 2 percent 5 percent 10 percent

13 Which of the following will produce higher sensitivity of a penetrant test?

 Leaving the part immersed in the penetrant for the entire dwell time

 Leaving the part immersed in the wet developer for the entire developer time

 Using a nonaqueous wet developer Allowing the specimen to drain-dwell during its dwell time

14 The threshold of visual acuity for a person with 20/20 vision is about:

 0.003 inches 0.03 inches 0.03 mm 0.3cm

15 Which penetrant method is easiest to use in the field?

 Post emulsified Visible water washable Visible dye Fluorescent water washable

16 When removing excess penetrant with water, the wash time should be:

 As long as the specifications allow Based on the temperature of the part As long as necessary to decrease the background to an

acceptable level Longer if the water temperature increases

17 When removing water washable penetrant the maximum water pressure should be:

 25 psi 40 psi 50 psi 70 psi

18 Dye vaporization or sublimation can result in:

 Penetrant fading Developer fading

 Emulsifier sensitivity Emulsifier fading

19 When fluorescent penetrant inspection is performed, the penetrant materials are formulated to glow brightly and to give off light at a wavelength:

 Close to infrared light Close to the wavelength of x-rays That the eye is most sensitive to under dim lighting

conditions In the red spectrum

20 The steps listed would represent which type of penetrant method?  1.  Pre-clean 2.  Apply penetrant and allow to dwell.  3.  Pre-rinse to remove first layer of penetrant.  4.  Apply hydrophilic emulsifier 5.  Rinse to remove excess penetrant  6.  Dry part  7.  Apply developer and allow part to develop 8.  Inspect.

 Type I method A Type I method B Type I method D Type II method D

21 Application of the emulsifier should not be performed with a:

 Spray Brush Dip Both A and B

22 How often should the wet soluble powder concentration be checked?

 Daily

 Weekly Monthly Every 500 parts

23 Water soluble developers consist of a group of chemicals that are:

 Saturated in water and experience a chemical shift allowing it to fluoresce on the parts surface

 Only used on rough porous surfaces Dissolved in water Not to be used on galvanized parts

24 The performance of a penetrant:

 Will remain consistent as long is it is stored in a temperature range of 50 to 100o F

 Will only degrade of the temperature exceeds 120o F Can be affected by contamination and aging Can be adjusted with the dwell time

25 Which of the following should be removed in order to obtain a good penetrant test?

 Varnish Oxides Plating All of the above

26 Which level of penetrant is the most sensitive?

 Level I Level II Level III Level IV

27 What industry and military specifications control a penetrants?

 Toxicity Flash point Corrosiveness All of the above

28 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

29 Which type of emulsifier is oil based?

 Hydrophilic emulsifier Lipophilic emulsifier Solvent removable emulsifier All of the above have an oil base

30 Which type of emulsifier is water based?

 Hydrophilic emulsifier Lipophilic emulsifier Type I emulsifier Form A emulsifier

31 Generally, there is no harm in using a longer penetrant dwell time as long as the penetrant:

 Is not allowed to dry Stays viscous Does not form clumps on the surface of the part

 Is mixed with emulsifier

32 Light intensity measurements are made using a:

 Refractometer Radiometer Pie gauge UV meter

33 Which developer form is used for dry powder developer?

 Form a Form b Form c Form d

34 Which developer form is used for water soluble developer?

 Form a Form b Form c Form d

35 Which developer form is used for water suspendible developer?

 Form a Form b Form c Form d

36 Which developer form is used for nonaqueous Type I developer?

 Form a Form b

 Form c Form d

37 Solvent suspendable developers are applied by:

 Dipping Brushing Spraying Immersion

38 Dry developer can be applied:

 To a wet part To a partially wet part but needs to be placed in a dryer

immediately To a dry part All of the above

39 Developer times are usually in the range of:

 10 minutes 10 seconds 20-30 minutes 5-60 minutes

40 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

41 Dry developer should be checked ______ in order to ensure it is fluffy and not caked:

 Daily

 Weekly Monthly Every 500 parts run through it

42 For UV lights used in LPI, the accepted intensity is _______ microwatts per square centimeter.

 100 500 700 1000

43 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

44 A penetrant must:

 Change viscosity in order to spread over the surface of the part

 Spread easily over the surface of the material Have a low flash point Be able to change color in order to fluoresce

45 Surface contaminants can lead to:

 A shift in the fluorescent wavelength to a lower angstrom level

 The part needing to be redipped in order to produce good results

 Higher background fluorescence All of the above

46 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

47 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

48 Which type of penetrant is a visible penetrant?

 Type I Type II Type III Type IV

49 Penetrant can be applied by:

 Dipping Brushing  Spraying All of the above

50 Which type of penetrant is a fluorescent penetrant?

 Type I Type II Type III

 Type IV