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AWS CWI > Liquid Penetrant Testing > Flashcards

Liquid Penetrant Testing Flashcards

1
Q

The penetrant application method that provides the greatest sensitivity is:

a. to keep the part continuously submerged in the penetrant during the dwell time
b. to dip the part into the penetrant for a short time and then remove and drain for the remainder of the dwell time
c. to apply the penetrant with a brush and continue applying penetrant to keep the surface fluid
d. all of the above

A

b. to dip the part into the penetrant for a short time and then remove and drain for the remainder of the dwell time

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2
Q

When using a higher viscosity penetrant, what adjustment should be made in the dwell time?

a. viscosity does not influence dwell time
b. higher viscosity requires an increase in dwell time
c. higher viscosity requires a decrease in dwell time
d. none of the above

A

b. higher viscosity requires an increase in dwell time

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3
Q

The most popular sensitivity test specimen for comparing in-service penetrant with a sample of fresh unused penetrant is a:

a. cracked aluminum block
b. cracked chrome plate specimens
c. part with a knows crack
d. meniscus lens

A

a. cracked aluminum block

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4
Q

In most cases, penetrant quality control tests are comparison tests. The comparison standard is obtained from:

a. an unused batch of penetrant or emulsifier
b. when applying dry developer, which of the following application can be used
c. a new material over a time span
d. the national institute for standards and technology

A

a. an unused batch of penetrant or emulsifier

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5
Q

When applying dry developer, which of the following application can be used?

a. dipping
b. the fog chamber
c. an electorstatic fog
d. dusting
e. all of the above

A

e. all of the above

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6
Q

The developer that is the easiest to remove is:

a. solvent-suspended developer
b. water-suspended developer
c. dry developer
d. water-soluble developer

A

c. dry developer

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7
Q

The filter used in front of the high pressure mercury vapor light has peak transmission at a wavelength of:

a. 2560 A
b. 3650 A
c. 3750 A
d. 390 A

A

b. 3650 A

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8
Q

The UV light intensity necessary for the detection of very fine indications is:

a. 750uW/cm^2
b. 900uW/cm^2
c. 1200uW/cm^2
d. 3000uW/cm^2

A

d. 3000uW/cm^2

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9
Q

The fluorescent indications that would most likely represent a tight or contaminated crack is:

a. a line of fluorescent spots
b. a wide bright line
c. one small spot
d. a cluster of spots

A

a. a line of fluorescent spots

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10
Q

A heat treatment crack would most likely be viewed as:

a. a fine, blue-white indication
b. an intermittent fine line of indications
c. a bright yellow-green indication
d. a line of bright dots

A

b. an intermittent fine line of indications

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11
Q

Stress corrosion cracking appears as very fine, sharp, jagged indications. If stress corrosion cracking is suspected, which of the following developers would provide the highest probability of detection?

a. dry powder developer
b. water-suspended developer
c. solvent-suspended developer
d. water-soluble developer

A

c. solvent-suspended developer

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12
Q

A very fine visible indication was detected and the inspector set the part aside for later inspection. Several hours later, the indication could not be found. Why?

a. the inspector did not really see an indication initially
b. the indication was irrelevant
c. the indication had bled out laterally into the coat of developer and had disappeared
d. any of the above was likely

A

c. the indication had bled out laterally into the coat of developer and had disappeared

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13
Q

Which of the following characteristics of a fluorescent penetrant indication can be used to evaluate the type and cause of the discontinuity?

a. brightness
b. size and shape
c. location
d. persistence
e. all of the above

A

e. all of the above

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14
Q

A hydrometer measures:

a. temp
b. density
c. specific gravity
d. viscosity
e. wetability

A

c. specific gravity

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15
Q

The developer that is best lifting penetrant indications is:

a. water-soluble developer
b. plastic developer
c. dry developer
d. solvent-suspended developer

A

b. plastic developer

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16
Q

The best type of penetrant to use on castings is:

a. solvent-removed fluorescent penetrant
b. water-washable fluorescent penetrant
c. post-emulsification visible penetrant
d. post- emulsification fluorescent penetrant

A

b. water- washable fluorescent penetrant

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17
Q

For dip tank applications, the developer that requires the least maintenance and quality testing is:

a. dry developer
b. water-suspended developer
c. solvent-suspended developer
d. water-soluble developer

A

a. dry developer

18
Q

A material that is not usually included in a portable penetrant kit is:

a. penetrant
b. emulsifier
c. solvent-suspended developer
d. solvent remover

A

b. emulsifier

19
Q

For a water-washable penetrant, the wash nozzle should provide a:

a. very fine soft spray
b. coarse soft spray
c. coarse brisk spray
d. hard scrubbing spray

A

c. coarse brisk spray

20
Q

The ability of the penetrant to penetrate a flaw is controlled by its:

a. surface tension
b. contact angle
c. viscosity
d. both a and b

A

d. both a and b

21
Q

PT inspection is defined as:

a. an electromagnetic process
b. a physical-mechanical process
c. a physical-chemical process
d. a mechanical-chemical process

A

c. a physical-chemical process

22
Q

Military specifications for penetrants list penetrants by systems. Which of the following systems is the most sensitive?

a. Type I, Method A, level 1/2
b. Type I, Method A and B, level 2
c. Type I, Method C, level 2
d. Type I, Method C, level 4

A

d. Type I, Method C, level 4

23
Q

A visible dye penetrant is not as sensitive as most fluorescent dye penetrants because:

a. a red visible dye needs a thicker threshold film
b. a visible dye does not emit light to attract the eye
c. a thick developer coat to provide a good white background can mask an indication
d. all of the above
e. A and C

A

b. a visible dye does not emit light to attract the eye

24
Q

Fluorescent dyes used in penetrants absorb photon energy at a wavelength of 365nm. The approximate wavelength of the color that most fluorescent penetrants emit is:

a. 425 nm
b. 525 nm
c. 625 nm
d. 725 nm

A

b. 525 nm

25
Q

The property that controls the rate of penetration is the:

a. viscosity of the penetrant
b. surface tension of the penetrant
c. volatility of the penetrant
d. wetting action of the penetrant

A

a. viscosity of the penetrant

26
Q

A penetrant must be lighter than water so that the water contamination will always sink to the bottom of the tank. This property is related to the:

a. viscosity
b. surface tension
c. volatility
d. specific gravity

A

d. specific gravity

27
Q

Which of the following is not compatible with chloride ions, total chlorine, and sulfur?

a. titanium
b. high nickel alloys
c. austenitic steels
d. all of the above
e. both b and c

A

d. all of the above

28
Q

It is often recommend that chloride content be limited to what percentage of the penetrant?

a. 0.01%
b. 0.1%
c. 1.0%
d. 1.1 %

A

c. 1.0%

29
Q

It is often recommended that sulfur content be limited to what percentage of the penetrant?

a. 0.01%
b. 0.1%
c. 1.0%
d. 1.1%

A

c. 1.0%

30
Q

Activity, viscosity, and water tolerance are the three properties of:

a. lipophilic emulsifiers
b. post-emulsified penetrant
c. hydrophilic emulsifiers
d. wet developers

A

a. lipophilic emulsifiers

31
Q

Viscosity is measured with a:

a. viscometer
b. hydrometer
c. surface diffractometer
d. cleveland open cup

A

a. viscometer

32
Q

Which of the following developers is purchased as a dry powder?

a. dry developer
b. water-suspended developer
c. water-soluble developer
d. all of the above

A

d. all of the above

33
Q

What is the highest contact angle that penetrant can hve and still penetrate spontaneously?

a. 15 degrees
b. 5 degrees
c. 40 degrees
d. 90 degrees

A

d. 90 degrees

34
Q

Capillary action is fastes in a:

a. wide, long crack
b. long, dirt filled crack
c. fine, clean crack
d. wide, shallow crack

A

c. fine, clean crack

35
Q

The rate of penetration can compensated for by varying the:

a. emulsification time
b. penetrating time
c. drying time
d. water washing time

A

b. penetrating time

36
Q

The most sensitive developer is:

a. dry developer
b. water-suspended developer
c. nonaqueous developer
d. plastic film developer

A

c. nonaqueous developer

37
Q

Which developer is not recommended with a water-washable penetrant?

a. dry developer
b. plastic film developer
c. solvent-suspended developer
d. water-soluble developer

A

d. water- soluble developer

38
Q

The most sensitive application method for dry developer is:

a. immersion
b. a dust cloud
c. a fluidized bed
d. a dust cloud–electrostatic gun

A

d. a dust cloud–electrostatic gun

39
Q

One advantage of background fluorescence is that it:

a. reduces the contrast of the indication
b. indicates that the part was not over-washed
c. reveals an excessive emulsification time
d. is hard to remove when a highly sensitive penetrant is applied to rough or porous surfaces

A

b. indicates that the part was not over-washed

40
Q

To provide safety for manual spray gun operators, electrostatic spraying requires that the penetrant materials have what level of electrical resistance?

a. high resistance
b. medium resistance
c. low resistance
d. it does not matter what resistance exists

A

a. high resistance

AWS CWI (15 decks)

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