30 Question PT quiz
1. Why is it advisable to have a black light installed at the wash station?
So that inspection can be done without drying parts.
To speed the bleeding of penetrant out of defects.
To check the effectiveness of the wash cycle.
To determine if parts have been covered with penetrant.
2. Which of the following (on the basis of cost-efficiency) NOT recommended for
penetrant application and dwell?
apply penetrant by pouring it on the part and allow to drain for 20 minutes
immerse the part in penetrant for 20 minutes then drain for 30 seconds
immerse the part in penetrant for 30 seconds then drain for 20 minutes
apply the penetrant using a clean paint brush then drain for 20 minutes
3. Which of the following contaminants could affect the sensitivity of a penetrant?
Acid.
Water.
Salts.
All of the above
4. The factor that has the greatest effect on the speed at which a penetrant
indication forms is:
relative size of defect
type of material tested
type of penetrant used
all of the above
5. Aluminium alloy test specimens that have been tested by the liquid penetrant
method should be thoroughly cleaned after testing because:
The acid in the penetrant may cause severe corrosion.
The alkaline content of wet developers and most emulsifiers could result in surface
pitting, particularly in moist atmospheres.
The toxic residue from the test will severely inhibit the application of paint on
aluminium alloys.
A chemical reaction between the penetrant and aluminium could cause a fire
because of internal combustion.
6. How is the degree of washing assessed when removing fluorescent penetrant:
Wash under UV-A light until only the slightest tint of fluorescence is left on the
surface
Wash under ISV-A light until no fluorescence is visible
Apply 200 kPa (30psi) water pressure at a minimum of 300mm for 10 minutes
Wash under white light until only the slightest tint of fluorescence is visible on the
surface
7. A fluorescent water-washable test system uses spray application of penetrant and
a storm cabinet (cloud chamber) for application of dry developer. At what locations
should black light be available?
the inspection booth only
the penetrant application station and the inspection booth
the penetrant removal station and the inspection booth
the penetrant application station, the penetrant removal station, and the inspection
booth
8. Which of the following types of discontinuities will not be detected by the liquid
penetrant test method?
Surface laminations.
Internal forging bursts.
Surface cracks.
Surface laps.
9. The main purpose of the filter on a black light source is to:
protect the bulb from mechanical damage
eliminate the harmful ultraviolet radiation which is produced with the black light
eliminate the white light which is produced with the black light
eliminate both the white light and the harmful ultraviolet radiation which are
produced with the black light
10. Which of the statements below best states the danger of using sandblasting for
cleaning surfaces to be penetrant tested?
The discontinuities may be closed.
Oil contaminants might be sealed in the discontinuities.
The sand used in the sandblasting operation may be forced into the discontinuity.
The sandblasting operation may introduce discontinuities in the part.
11. Which of the following is a recommended method of application of lipophilic
emulsiflers?
Immerse the part then drain for one minute before water rinsing.
Immerse the part for two minutes then commence water rinsing.
Brush the emulsifier on all urfaces then allow to drain for one minute.
Immerse the part for 15 minutes then allow to drain for 15 minutes before water
rinsing.
12. Which of the following discontinuities are all castings discontinuities?
stringers, cold shuts, laminations, hot tears
cold shuts, bursts, hot tears, laps
hot tears, cold shuts, inclusions, porosity
inclusions, porosity, laminations, shrinkage
13. Which of the statements below concerning the operation of the black light bulbs
of the mercury arc type is NOT true?
It takes about 5 minutes for the bulb to warm up to its full output when first turned
on.
The lamp will go out if the line voltage drops below 180 volts.
Line voltage variations above 260 volts will have little or no effect on the bulb.
If for any reason the arc is extinguished, the bulb will not immediately respond if
the lamp is turned on right after it has bee
14. Which of the following is an advantage of visible dye penetrants over
fluorescent penetrants?
Small indications are more easily seen.
They can be used on anodized and chrontate surfaces.
They make less background on rough surfaces.
No special lighting is required.
15. The emulsifier in the post-emulsifiable penetrant method:
provides a coating to which the developer can adhere
aids penetration into tight cracks
aids post-cleaning of the part
renders surface penetrant water-washable
16. The greater the blacklight intensity and the lower the ambient white light
intensity
the shorter the development time needed
the shorter the dark adaptation time required
the smaller the detectable indication
all of the above
17. Which of the following methods for applying non-aqueous developer is
normally considered most effective?
Spraying.
Swabbing.
Brushing.
Dipping.
18. Some alloys are susceptible to corrosion or embrittlement due to the chemical
action between the alloy and penetrant. This problem can be avoided after
inspection by:
application of inhibitor
wrapping parts in plastic
post cleaning and inhibitor application
blowing down parts with compressed air
19. Penetrant dwell time is dependant on:
discontinuity configuration
developer time
draintime
being at least 10 minutes
20. Shrinkage cracks or hot tears are usually found in what areas of a casting?
Thin sections only.
Heavy sections only.
Abrupt changes in thickness.
No longer a problem.
21. When carrying out penetrant leak testing:
a developer should NOT be used
the developer should be applied before the penetrant is applied
the penetrant and developer should be applied to opposite sides of the test part
both the penetrant and the developer should be applied to both sides of the test part
22. A penetrant indication, suspected of resulting from a small crack, is found in a
titanium compressor blade. Which of the following NDT methods would most
reliably confirm that a crack is present?
eddy cunent testing
magnetic particle testing
radiographic testing
ultrasonic testing
23. A commonly used method of checking the overall performance of a penetrant
system is by:
determining the viscosity of the penetrant.
measuring the wettability of the penetrant.
comparing two sections of an artificially cracked aluminium sample.
all of the above
24. During a penetrant test, water was used to remove the surface penetrant after
the penetrant dwell. The surface:
should be dried before the application of either dry or non-aqueous wet developer
need not be dried before the application of either dry or non-aqueous wet developer
need not be dried before the application of dry developer but should be dried before
the application of non-aqueous wet develope
should be dried before the application of dry developer but need not be dried before
the application of non-aqueous wet develope
25. Which of the following physical properties, more than any other, determines
what makes material a good penetrant?
Viscosity.
Surface tension.
Wetting ability.
No one single property determines if a material will or will not be a good penetrant.
26. Which of the following penetrant inspection processes is generally agreed to be
the most sensitive and reliable?
Water-washable fluorescent penetrant with a water suspended developer.
Post-emulsifiable colour-contrast penetrant with a non-aqueous wet developer.
Post-emulsifiable fluorescent penetrant with a non-aqueous wet developer.
Solvent-removable fluorescent penetrant with a dry developer.
27. The part is a 12.5 mm (1/2) thick aluminium plate with a Vee weld. Description
- the indication appears in an area that is somewhat dish-shaped. The indication
extends out from the centre in a spoke formation. The indication is:
Shrinkage.
Non-relevant.
A quench crack.
A crater crack.
28. When penetrant testing for shallow discontinuities using a post emulsification
penetrant, the emulsification time should be long enough to:
Mix the emulsifier with the excess surface penetrant only.
Mix the emulsifier with all the penetrant on the surface and in discontinuities.
Mix the emulsifier with penetrant in the discontinuities.
Allow the emulsifier to thy out to a white powder.
29. Which of the following is a discontinuity that might be found in a forging?
Shrinkage crack.
Lap.
Hot tear.
Lamination.
30. Which of the following is TRUE when solvent precleaners are used prior to
penetrant inspection?
Penetrant should be applied to the surface immediately after precleaning.
The inspector should wait for a few minutes after precleaning before applying
penetrant.
Penetrant may be applied either immediately after precleaning, or after an interval
of time, provided the surface is not allowed
After precleaning, the part should be checked for fluorescence using black light,
after which the developer is applied.
