.title {font-family: Verdana, Arial, Helvetica, sans-serif; font-style: normal; line-height: normal; font-weight: bold; text-decoration: none; font-size: 24px; color: #00399C} .message {font-family: Verdana, Arial, Helvetica, sans-serif; font-style: normal; line-height: normal; font-weight: normal; text-decoration: none; font-size: 12px; color: #808080} .userdata {font-family: Verdana, Arial, Helvetica, sans-serif; font-style: normal; line-height: normal; font-weight: bold; text-decoration: none; font-size: 12px; color: #ffffff} .question {font-family: Verdana, Arial, Helvetica, sans-serif; font-style: normal; line-height: normal; font-weight: bold; text-decoration: none; font-size: 12px; color: #000000} .answer {font-family: Verdana, Arial, Helvetica, sans-serif; font-style: normal; line-height: normal; font-weight: normal; text-decoration: none; font-size: 10px; color: #000000} .input {font-size:11px; border-style:solid; border-color:#00399C; border-width:1px; color:#000000} .inputuserdata {font-family: Verdana, Arial, Helvetica, sans-serif; font-size:12px; border-style:solid; border-color:#00399C; border-width:1px; height:20px; color:#000000} .footer {font-family: Verdana, Arial, Helvetica, sans-serif; font-style: normal; line-height: normal; font-weight: normal; text-decoration: none; font-size: 9px; color: #808080} // Liquid Penetrant Inspection 50 Question Quiz Liquid Penetrant Inspection 50 Question Quiz ~ First name ~ ~ Last name ~ 1 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 2 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 3 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 4 Which type of penetrant is most sensitive? Type I Type II Type III Type IV 5 When performing a liquid penetrant test, the surface of the part under inspection should be: Slightly damp Clean and smooth to the touch Free of oil, grease, water and other contaminants All of the above 6 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 7 Once the surface of the part has been cleaned properly, penetrant can be applied by: Spraying Brushing Dipping All of the above 8 Radiometers should be calibrated every ___ months. 2 4 6 12 9 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 10 The total time that the penetrant is in contact with the part surface is called the: Soak time Baking time Dwell time Immersion time 11 Which developer form is used for dry powder developer? Form a Form b Form c Form d 12 Minimum penetrant dwell times are usually: 1-5 minutes 1-30 minutes 5-60 minutes 60-100 minutes 13 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 14 Developers come in a variety of forms and can be applied by: Dusting Dipping Spraying All of the above 15 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 16 Developer times are usually in the range of: 10 minutes 10 seconds 20-30 minutes 5-60 minutes 17 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 18 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 19 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 20 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 21 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 22 Which method is used to primarily to inspect small localized areas? Method A Method B Method C Method D 23 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 24 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 25 Which type of penetrant is a visible penetrant? Type I Type II Type III Type IV 26 Which type of penetrant is a fluorescent penetrant? Type I Type II Type III Type IV 27 Which type of developer is considered the most sensitive? Water suspendable Water soluble Dry powder Nonaqueous wet 28 Which type of penetrant is less vulnerable to contamination from cleaning fluid? Type I Type II Type III Type IV 29 Application of the emulsifier should not be performed with a: Spray Brush Dip Both A and B 30 Which method of penetrant removal is water washable? Method A Method B Method C Method D 31 For UV lights used in LPI, the accepted intensity is _______ microwatts per square centimeter. 100 500 700 1000 32 Which method of penetrant removal is post emulsified, lipophilic? Method A Method B Method C Method D 33 Which method of penetrant removal is solvent removable? Method A Method B Method C Method D 34 Which method of penetrant removal is post emulsified, hydrophilic? Method A Method B Method C Method D 35 Which emulsifier system is water based? Hydrophilic emulsifier Lipophilic emulsifier Type I emulsifier Form A emulsifier 36 Which level of penetrant is the most sensitive? Level I Level II Level III Level IV 37 Which of the following should be removed in order to obtain a good penetrant test? Varnish Oxides Plating All of the above 38 Post emulsified penetrants: Are most often used in the field Should never be used in the field Require a separate emulsifier to break the penetrant down and make it water washable Require a separate emulsifier to break down the cleaner and make it solvent removable 39 Developers are used to: Make the penetrant fluoresce Reduce the dwell time Pull trapped penetrant material out of the defect All of the above 40 What industry and military specifications control a penetrants? Toxicity Flash point Corrosiveness All of the above 41 Which emulsifier system is oil based? Hydrophilic emulsifier Lipophilic emulsifier Solvent removable emulsifier All of the above have an oil base 42 Which penetrant method is easiest to use in the field? Fluorescent, post-emulsifiable Visible dye, water washable Visible dye, solvent removable Fluorescent, water washable 43 Which emulsifier is most sensitive to contact time when applied to the parts surface? Hydrophilic emulsifier Lipophilic emulsifier Fluorescent emulsifier Visible dye emulsifier 44 Which developer form is used for water soluble developer? Form a Form b Form c Form d 45 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 46 Which developer is commonly considered as the least sensitive? Dry developer Non-aqueous wet developer Hydrophilic developer Lipophilic developer 47 Raising the temperature will: Raise the speed of evaporation of penetrants Reduce the emulsifier time Increase the developer time Require the need of a post emulsified penetrant 48 Which developer form is used for water suspendible developer? Form a Form b Form c Form d 49 Which developer form is used for nonaqueous Type I developer? Form a Form b Form c Form d 50 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 Copyright © The Collaboration for NDT Education..