Specific Examination LPT

7/16/2019 Specific Examination LPT

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LIQUID PENETRANT INSPECTION SPECIFIC EXAM

Name______________________ Date___________

1. Developer is required to:a. Draw out the penetrant from the discontinuityb. Provide contrast between the penetrant and the parts background color c. ncrease the penetrants fluorescenced. !oth " and !

#. Developer times are usually in the range of:a. 1$ minutesb. 1$ secondsc. #$%&$ minutesd. '%($ minutes

&. )enerally* there is no harm in using a longer penetrant dwell time as long as the penetrant:a. s not allowed to dryb. +tays viscousc. Does not form clumps on the surface of the partd. s mi,ed with emulsifier

-. arge defects can be hidden under a paint surface because:a. /he paint will fill in the cracks and change the fluorescence of the penetrantb. Paint is more elastic than metal and will not fracturec. /he penetrant will adhere to the paint resulting in ma,imum fluorescenced. "ll of the above apply

'. P can be used to test most materials provided the surface of the part is:

a. 0eated to a temperature above 1$$ °b. s not e,tremely rough or porousc. +mooth and uniformd. 2leaned with number $$' grit

(. 3nce the surface of the part has been cleaned properly* penetrant can be applied by:a. +prayingb. !rushingc. Dippingd. "ll of the above

4. Nonaqueous developer is typically applied:

a. !y dusting the surface of the partb. !y dipping the part is a mi,ed batch of developer c. !y splashing the surface with a brushd. !y aerosol spraying

5. +olvent suspendable developers are applied by:a. Dippingb. !rushingc. +prayingd. mmersion

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7. /he total time the penetrant is in contact with the part surface is called the:a. Penetrant dwell timeb. Developer timec. 9mulsifier timed. Penetrant evaporation time

1$. hen solvent removable penetrant is used:a. 2are must be taken when removing the penetrant from the surface of the partb. t should be washed off the surface of the part at an angle of -' degreesc. " low impact emulsifier should always be usedd. " solvent removable emulsifier should also be used

11. hich method is used to primarily inspect small* locali;ed areas<a. =ethod "b. =ethod !c. =ethod 2d. =ethod D

1#. hich type of penetrant is less vulnerable to contamination from cleaning fluid<a. /ype b. /ype c. /ype d. /ype >

1&. hite light intensity at the surface of the part when using a visible dye penetrant should be:a. " minimum of '$ foot%candlesb. " ma,imum of '$ foot%candlesc. " ma,imum of 1$$ foot%candlesd. " minimum of 1$$ foot%candles

1-. hich of the following is the most commonly used method for removing non%water%washable visibledye penetrant from the surface of a test specimen<

a. Dipping in a solventb. +prayingc. 0and wipingd. !lowing

1'. hen conducting a penetrant test* spherical indications on the surface of a part could be indicativeof:

a. atigue cracksb. Porosity

c. eld lapsd. 0ot tears

1(. /he tendency of a liquid penetrant to enter a discontinuity is primarily related to:a. /he viscosity of the penetrantb. /he capillary forcesc. /he chemical inertness of the penetrantd. /he specific gravity of the penetrant.

14. /he single most important factor determining the speed penetrant enters a flaw is:6var6www6apps6conversion6tmp6scratch_16#711&7-7(.doc # of & 8evised: (6#-61$



a. +urface finishb. >iscosityc. =ethod of applicationd. Depth of defect

15. Nonaqueous suspendable developers are used primarily with:a. luorescent penetrantsb. 3il and whitingc. 2olor contrast penetrantsd. Post emulsified penetrants

17. >iscosity is used to determine drag out. ?nits used to measure viscosity are:a. Poundalsb. m6secc. 2entistokesd. milligravs per cc

#$. 2apillary force is inversely proportional to:a. +i;e of surface openingsb. +urface tensionc. 2ontact angled. "ll of the above

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Specific Examination LPT