30 Question PT quiz

1. Which of the following discontinuities might be found in a welded fabrication?

Shrinkage.

Lack of fusion.

Seams.

Laps.

2. Sensitiviy of the inspection may be reduced with water-washable fluorescent penetrant by

over washing

light leaks

over developing

All of the above

3. Which of the following is TRUE concerning vapour degreasing prior to penetrant inspection?

Vapour degreasing is a commonly used cleaning method.

Parts should be allowed to cool prior to application of penetrant.

Wet parts need not be dried prior to vapour degreasing because the hot vapour will dry the parts.

After parts have been vapour degreased they should be given a final solvent preclean prior to penetrant inspection.

4. 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.

5. 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.

6. Which of the following is an advantage of solvent wipe methods over water washing?

No special lighting is necessary during inspection.

They provide a quicker penetration of small openings.

Small indications are more easily seen.

They can easily be carried out in the field/remote areas.

7. The penetrant most easily removed from wide, shallow discontinuities is:

Water-washable fluorescent penetrant.

Post-emulsification fluorescent penetrant.

Post-emulsifiable visible dye penetrant.

Solvent removable visible dye penetrant.

8. Prior to penetrant testing of a previously machined soft metal part, which of the cleaning methods listed below would best remove any smeared metal that could mask discontinuities?

Etching.

Shot peening.

Alkaline cleaning.

Water cleaning with detergents.

9. 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.

10. When improper processing causes inspection difficulties, what should the inspector do?

Swab parts with a solvent.

Use a correct bleed-back procedure.

Erase non-relevant fluorescence.

Reprocess the part.

11. When penetrant testing Titanium alloys, the materials used in the penetrant system should not contain any constituent quantities of:

Carbon or oil.

Halogenated solvents.

Emulsifier or oil.

Fluorescent agent.

12. The most difficult developers to remove are the

film type developer

dry developers

aqueous soluble developers

wet aqueous developers

13. The emulsifier is used:

To wash the penetrant out of discontinuities.

As an aid in washing off the surface of parts when using either the water or oil soluble penetrants.

To emulsify the oil-soluble penetrant, thereby making it water-washable.

To preclean parts before applying penetrant.

14. Different types of discontinuities in various materials require different penetration limes. In general, fine, tight cracks require:

A shorter penetration time than is required for large shallow diseontinuities.

A longer penetration time than is required for large shallow discontinuities.

The same penetration time as is required for large shallow discontinuities.

A heavy etch before they can be detected.

15. Which of the statements below apply to the liquid penetrant method of testing?

The penetrant test method is less flexible than the eddy current test method.

The penetrant test method is less reliable than the magnetic particle method for finding surface defects in aluminium alloy whee

The penetrant test method will not detect fatigue cracks.

The penetrant test method is more reliable than radiographic testing when attempting to detect minute surface discontinuities.

16. Which of the following is a possible cause for false penetrant indications?

Excessive washing.

Inadequate application of developers.

Penetrant or part too cold during penetration time.

Lint or dirt.

17. Which system would provide maximum sensitivity for detection of fatigue cracks in an aircraft wheel?

A water washable fluorescent penetrant, sensitivity level 1, with dry developer.

A visible solvent removable penetrant with dry developer.

A post emulsifiable fluorescent penetrant, sensitivity level 2, with dry developer.

A post emulsifiable fluorescent penetrant, sensitivity level 4, with non aqueous wet developer.

18. 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.

19. Which of the following discontinuities could be classified as a service induced discontinuity?

Fatigue crack.

Porosity.

Machining tear.

Lap.

20. 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.

21. 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.

22. In NDT, a response or evidence of response which requires interpretation to determine its significance is called

an indication

a defect

an irregularity

a signal

23. 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

24. Which discontinuities are more dangerous?

Gas pores in a weld.

Subsurface shrinkage.

Surface breaking fatigue cracks

Surface breaking porosity.

25. A part to be penetrant tested has just been removed from a vapour degreaser. What is the next step in processing?

clean the part using an aerosol container of solvent

immerse the part immediately in the tank of penetrant

heat the part to evaporate the degreasing solvent, then immerse it in the tank of penetrant

wait for a few minutes, then immerse the part in the tank of penetrant

26. The excess penetrant removal technique that removes the most penetrant from discontinuities is:

water wash

post emulsified water wash

solvent wipe

rag wiping

27. Which of the following statements concerning contaminating materials on the surface of a part to be penetrant tested is not true?

The contaminant may be of a composition that attacks the penetrant and reduces the fluorescence or colour of the penetrant.

The contaminants may be of such a nature that they reduce or even prevent capillary action by the penetrant.

The contaminant may retain the penetrant and thus increase the sensitivity of the inspection.

The contaminant may completely fill the crack preventing the entry of penetrant.

28. Which of the items listed below is not an advantage of the liquid penetrant test method?

The method can find all types of discontinuities.

The method is simple in principle and relatively easy to understand.

The method is essentially simple in application.

There are few limitations on the size and shape of the article that can be treated by this method.

29. The penetrant indication of a forging lap will normally be:

A round or nearly round indication.

A cluster of indications.

A continuous line.

A dotted line.

30. 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

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