E3-PT-S-1 - APEX-FI

Tthe most common type of contaminant in fluorescent penetrant fluid is:

metal filings
oil
detergents (from cleaning)
water

The first step in conducting a liquid penetrant test on a surface that has been painted is to:

carefully apply the penetrant over the surface
completely remove the paint
thoroughly wash the surface with a detergent
wire brush the surface to roughen the smooth surface coating of paint

When an inspector is working in a darkened area, he/she should become adjusted to the dark before inspecting parts. The generally accepted time period for becoming accustomed to the dark is:

1 minute
5 to 10 minutes
10 to 15 minutes
no waiting period is necessary

Liquid penetrant testing can be used to detect:

discontinuities 1.6 mm (0.06 in.) below the surface
internal discontinuities
discontinuities open to the surface
all discontinuities

The problem with retesting a test specimen that has been previously tested using liquid penetrant is that:

the penetrant may form beads on the surface
the dried penetrant residue left in discontinuities may not readily dissolve and the retest may be misleading
the penetrant will lose a great deal of its color brilliance
none of the above are correct statements

When a penetrant is applied to a part by submerging the part in a penetrant bath, the part must:

remain in the penetrant bath during the entire penetration time
remain in the penetrant bath for at least one-half the penetration time
remain in the penetrant bath only long enough to ensure that the surface is covered with penetrant
not remain in the penetrant bath for a period more than 5 minutes

Which of the following safety precautions does not apply when handling penetrant materials?

prolonged contact of penetrant with skin should be avoided because the oil or solvent base may cause skin irritation
excessive amounts of developer powders should not be inhaled
air-line respirators and complete protective clothing must be worn at all times
because the solvents used with the visible penetrant process are flammable, this material should be kept away from open flames

How long must a part be kept wet with penetrant before the removal process is started?

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
since the penetrant will penetrate a discontinuity of any size in a matter of seconds, the removal process should start as soon as possible after the penetrant has been applied
3 minutes
10 minutes

The failure to completely remove acid materials from a part before fluorescent penetrant is applied will result in:

a decrease in the fluorescence of the penetrant
a need to double the penetrating time
a permanent stain on the part
all of the above

Penetrant is applied to a part by dipping. The part is then placed on a rack while the penetrant seeps into discontinuities. If the penetration time is too long, it will be difficult to rinse the penetrant from the part. If this happens, the normal rinsing properties can be restored by

chilling the part to a temperature of 4ºC (40ºF)
heating the part to a temperature of 54ºC (130ºF)
redipping the part
applying a wet developer before attempting to rinse the part

When using a fluorescent penetrant, the actual inspection must be performed:

in a brightly lighted room
with the part at a temperature between 10 and 79ºC (125 and 175ºF)
immediately after the developer has been applied
in a darkened area under a black light

Which of the following could be a source of false indications on a test specimen?

penetrant on the test table
penetrant on the hands of the inspector
contamination of dry or wet developer with penetrant
all of the above

The best choice of a developer for use on a very smooth surface when using a fluorescent penetrant would be:

dry – fluffy
dry – regular
wet
none of the above

Which of the following would be the most desirable center wavelength for the output of the light source used in fluorescent processes?

3200 A (320 nm)
3650 A (365 nm)
5200 A (1520 nm)
5650 A (565 nm)

Fluorescent dyes are added to developers to enhance discontinuity indications.

True
False

The function of the solvent cleaner when used with a post-emulsification penetrant is to:

render surface penetrant water washable
remove excess penetrant from test surfaces
remove penetrant from discontinuities
speed up emulsification of penetrant

A water wash that is too hot is detrimental to test results because:

It may remove some of the penetrant from the discontinuities.
It may remove fluorescent dyes from penetrant.
It may form water contaminants in smaller discontinuities

Which of the following developers is rated highest in sensitivity?

Dry
Nonaqueous wet
Water suspended particle
Water soluble

The time duration that test articles must remain in drying oven, following water-based wet developer application, should be long enough to:

Dry penetrant in discontinuities
Sufficiently heat test articles
Just dry test surfaces
Assure maximum bleedout of penetrant

Round or nearly round indications on the surface of a test article are indications of:

Cracks
Nonmetallic inclusion
Seams
Porosity

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