NDT NDE ASNT Questions and answers for PT, LPI level II (4).

17. In Penetrant testing, brushing of Penetrant to the component is
a. Not recommended
b. Recommended
c. Only criteria is adequate coverage
d. B and C of the above (answer)
18. Even without developing, the Penetrant can come out of the discontinuity
a. True
b. False
c. But it is very thin layer to be seen
d. A and C of the above (answer)
19. How long must a part be kept wet with Penetrant before the removal process is started?
a. It varies depending on the type of Penetrant used, the type of material to be tested, the
sensitivity desired and the type of discontinuities to be detected (answer)
b. Since the Penetrant will Penetrant a discontinuity if any size in a matter of seconds, the removal
process should start as soon as possible after the penetrant has been applied
c. 3 minutes
d. 10 minutes
20. Which of the following penetrant will be suitable to cover the maximum area per litre of the penetrant?
a. High viscosity penetrant
b. Low viscosity penetrant (answer)
c. Penetrant with high density
d. Penetrant with low density
21. Which of the following is an advantage of visible dye penetrants over fluorescent penetrants?
a. Small indications are more easily seen
b. They can be used on anodized and chromate surface
c. They make less background on rough surfaces
d. No special lighting is required (answer)
22. A general accepted method for removing excess non water washable penetrant is:
a. Repeatedly dipping the test specimen in a cleaner
b. Soaking the test specimen in hot detergent water
c. Blowng the excess penetrant off the surface of the part with compressed air
d. Wiping and cautiously the test specimen with a cleaner dampend cloth in one direction. (answer)
23. Visible penetrant may be applied by:
a. Brushing
b. Spraying
c. dipping
d. All of the above (answer)
24. The first step in conducting a liquid penetrating test on a surface that has been painted is to:
a. Carefully apply the penetrate over the surface
b. Completely remove the paint (answer)
c. Thoroughly wash the surface with a detergent
d. Wire brush the surface to roughen the smooth surface coating of paint
25. The most desirable objectives governing the cleaning operations when removing surface penetrant are to:

a. Remove little penetrant from the defects and a minimum residual penetrant remaining on the
surface.
b. Remove little penetrant from the defect and no residual penetrant remaining on the surface.
c. Remove no penetrant from the defects and leave a minimum of residual penetrant on the part
surface.
d. Remove no penetrant from the defects and leave no penetrant on the part surface (answer)
26. Emulsifiers whether lipo or hydro philic acts on the penetrant by
a. Solvent action
b. Dispersive action
c. Mechanical action
d. Mixing action
e. Detergent action (answer)
27. The mechanism of lipophilic emulsifier on penetrant is one of
a. Diffusing with penetrant making it easy for water washing (answer)
b. Dispersing the penetrant so as to make it water washable
c. Agitating the penetrant with water emulsifier combination
d. Detergent action
28. The sensitivity of hydrophilic emulsifier is normally high when the concentration of the emulsifier is low say 5%. The disadvantage is
a. The time on water washing is high (answer)
b. Penetrant tolerance
c. The bath life is low
d. A and b of the above
e. B and c of the above
29. Emulsification time is very critical
a. Manufacturers recommendation need be strictly adhered to
b. Determined experimentally for the component under inspection (answer)
c. Effectiveness is ascertained by background fluorescence
d. A higher emulsification time is safer to remove the excess surface penetrant
30. Wash cycle timing are considered more critical in:
a. Water washable penetrant
b. Lipophilic post emulsifiable penetrants. (answer)
c. Hydrophilic post emulsifiable penetrant
d. All of the above
e. A and c
31. Emulsifier time:
a. Is important but not normally critical
b. Is the time needed to rinse the emulsifier and excess penetrant from the surface (answer)
c. Is extremely important but will not greatly affect test results
d. Should be as long as economically practical
32. Which of the following is type of developer used in Penetrant inspection
a. Dry
b. Aqueous particulate
c. Non aqueous particulate
d. Water soluble

e. All of the above (answer)
33. The preference for dry developer over wet developer in specific situation is
a. Dry developer is more effective on smooth surfaces & provide better resolution (answer)
b. Easy to apply by spraying or flowing
c. Better on defects when heavy bleed out results
d. Easier to handle than wet developers
34. Developing powder should always be:
a. Highly fluorescent
b. Applied wet
c. Colour less
d. Evenly applied (answer)
35. The peak wave length of black light with the filter is
a. 3200A to 4000A
b. 3650A (answer)
c. 2000a to 4000A
d. 4nm to 4000 nm
e. 200-4000 nm
36. Visible light intensity in the dark room for fluorescent inspection should not exceed
a. 2 lux
b. 20lux (answer)
c. 2 ft candles
d. 29 ft candles
e. B and c of the above
37. The physiological effect of black lights, if recommended filters are not used, include
a. Damage to the eye
b. Dark adaptation
c. Temporary blindness
d. All of the above (answer)
38. For cast surface, the Penetrant that will give min. background
a. Post emulsifiable
b. Water washable (answer)
c. Solvent removable
d. Dual mode
39. It is required to detect large cracks in an Alluminium forging. The satisfactory method would be
a. Type I, method B or D
b. Type II method B or K
c. Type I method A or C
d. Type II method A or C (answer)
40. Which of the following are not compatible with chlorine ions, total chlorine and sulphur?
a. High nickel alloys
b. Austentic alloys
c. Titanium
d. All of the above (answer)

Additional Questions:

21. Which of the following discontinuities might be found in the rolled plate?
A. Laminations
B. Shrinkage
C. Lack of fusion
D. Undercut
22. 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
23. Which of the following discontinuities would be impossible to detect using a liquid penetrant test?
A. Forging lap
B. Crater crack
C. Grinding cracks
D. Non-metallic internal inclusions
24. Which of the statements below best states the danger of using sandblasting for cleaning surfaces to be penetrant tested?
A. The discontinuities may be closed
B. Oil contaminants might be sealed in the discontinuities
C. The sand used in the sandblasting operation may be forced into the discontinuity
D. The sandblasting operation may introduce discontinuities into the part
25. Why is it advisable to have a black light installed at the wash station?
A. So that inspection can be done without drying parts
B. To speed the bleeding of penetrant out of defects
C. To check the effectiveness of the wash cycle
D. To determine if parts have been covered with penetrant
26. Of the methods listed below, the most effective means of pre-cleaning a test item prior to a penetrant test is
A. Vapor degreasing
B. Detergent cleaning
C. Steam cleaning
D. Solvent wiping
27. When viewing parts, the fluorescent background may indicate:
A. Poor washing
B. Insufficient emulsifying time(post emulsification method)
C. Porous material and coating
D. Improper cleaning before the penetrant cycle
E. All of the above
28. Which factor would apply in determining the dwell time required for the penetrant to be effective?
A. Type of discontinuity sought
B. Shape of part
C. Size of part
D. Surface roughness
29. Developing time depends on the:
A. Type of penetrant used
B. Type of developer used and type of discontinuity to be detected
C. The temperature of the material being used
D. All of the above
30. When penetrant testing titanium alloys, the materials used in the penetrant system should not contain any constituent quantities of:
A. Carbon or oil
B. Halogenated solvents
C. Emulsifier or oil
D. Fluorescent agent

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