Questions for Liquid Penetrant Testing – General

Questions for Liquid Penetrant Testing – General

1) The Liquid Penetrant examination can only use for:

(a)       defect open to surface

(b)       subsurface crack extended to surface

(c)        nonporous and nonreactive materials

(d)       All of the above

2) Liquid penetrant testing is based on the principle of:

(a)       Polarized sound waves in a liquid

(b)       Magnetic domains

(c)        Absorption of X- rays

(d)       Capillary action

3) Which of the following chemical elements are normally held to a minimum in liquid penetrant materials, when testing stainless steel and titanium?

(a)       Hydrogen

(b)       Chlorine

(c)        Carbon

(d)       Oil

4) The time, during which the examination job is covering with penetrant, is known as:

(a)       blotting time

(b)       waiting time

(c)        drain time

(d)       dwell time

5) Which of the following is a prerequisite for a penetrant test?

(a)       Developer must be applied in a thin, even coat

(b)       Any surface coatings or soils must be completely removed

(c)        All traces of penetrant materials should be removed after testing is complete

(d)       The test object must be non-magnetic

6) What is the danger associated with using a wire brush during pre-cleaning?

(a)       Bristles from the wire brush may cause false indications

(b)       Contaminants from the wire brush may cause delayed hydrogen cracking of high carbon steels

(c)        The wire brush may not adequately remove organic soils

(d)       The wire brush may close or smear metal over

7) What additional surface preparation or cleaning must be performed on a machined or ground aluminium casting prior to penetrant testing?

(a)       Vapour degreasing

(b)       Etching

(c)        Detergent wash

(d)       Nothing

8) Non-aqueous wet developer is applied:

(a)       Immediately before removal of excess penetrant

(b)       Immediately after removal of excess penetrant

(c)        After the excess penetrant is removed and part surface is dried

(d)       For maximum sensitivity results

9) Post cleaning is especially important when:

(a)       Post emulsified penetrants are used

(b)       Phosphate containing detergents are used

(c)        Chlorinated hydrocarbons are used

(d)       The test object will be used in a liquid oxygen environment

10) Which of the following is normally used as a method of removing excess penetrant when using the solvent removable penetrant process?

(a)       A water spray

(b)       A hydrophilic scrubber

(c)        A solvent spray

(d)       Clean with lint free towels moistened with solvent

11) During a visible, solvent removable penetrant test, complete penetrant removal is indicated by:

(a)       Absence of red indications on the test piece surface

(b)       Clean rinse water

(c)        Completion of the rinse cycle

(d)       Absence of red dye on the cleaning towels

12) Which penetrant process is best suited to high production rates of many small parts?

(a)       Solvent removable

(b)       Water washable

(c)        Post emulsifiable

(d)       Fluorescent

13) The typical temperature ranges for conducting a liquid penetrant test is:

(a)       0 to 60ºC

(b)       10 to 52ºC

(c)        20 to 52ºC

(d)       10 to 52ºK

14) Which of the following methods is not recommended for pre-cleaning prior to a liquid penetrant test?

(a)       Steam cleaning, etching, rust and paint removal

(b)       Solvent wipe, vapour degreasing, ultrasonic bath cleaning

(c)        Blasting, grinding, filing, honing, machining

(d)       All of the listed methods are not recommended

15) The purpose of using a developer is:

(a)     To create a contrasting background for the penetrants to ensure better visibility of indications

(b)       Assists in reverse capillary action due to absorption ability of developers

(c)        Prevent the part from corroding after the liquid penetrant test

(d)       To ensure that the part has been correctly heat treated

(e)       Both a and b are correct

16) Which type of developer would you use to obtain the highest sensitivity test results?

(a)       Dry

(b)       Non-aqueous wet

(c)        Aqueous wet

(d)       Lipophilic

17) A soft aluminum test piece is to be penetrant tested. The piece has previously been sand blasted to remove tightly adhering soils. What additional surface preparation should be performed?

(a)       Etching

(b)       Solvent cleaning

(c)        Ultrasonic cleaning

(d)       Grinding

18) A penetrant which requires a separate emulsification step prior to removal from the surface of the test piece is called?

(a)       Solvent removable

(b)       Water washable

(c)        Post emulsifiable

(d)       Solvent suspended

19) A penetrant testing method in which the degree of washability can be controlled by emulsification is called:

(a)       Self emulsifying

(b)       Post emulsifiable

(c)        Water washable

(d)       Solvent removable

20) Close to surface discontinuities are best detected by which penetrant testing method?

(a)       Solvent removable

(b)       Water washable

(c)        Post emulsifiable

(d)       None of the above

21) The general term used to refer to break the metallic continuity of the part being tested is:

(a)       defect

(b)       discontinuity

(c)        crack

(d)       indication

22) Which of the following statements concerning contaminating materials on the surface of a penetrant test specimen is false?

(a)       the contaminant may be composition that attacks the penetrant and reduces the fluorescence or color of the penetrant

(b)      the contaminant may be reduce or even prevent capillary action by the penetrant

(c)        the contaminant may retain the penetrant and thus increase the sensitivity of the inspection

(d)       the contaminant may completely fill the crack and thus prevent the entry of penetrant

23) Which of the following is a discontinuity that might be found in rolled plate?

(a)       lamination

(b)       lack of fusion

(c)        undercut

(d)       bleedout

24) A commonly used method of checking on the overall performance of a liquid penetrant system is by:

(a)       determining the viscosity of the penetrant

(b)       measuring the wetability of the penetrant

(c)     comparing sections of artificially cracked specimens

(d)       all of the above

25) Which of the following is an advantage of visible dye penetrants over fluorescent penetrant?

(a)     Small indication 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

26) Which of the following contaminants could affect the sensitivity of a penetrant?

(a)       acid

(b)       water

(c)        salt

(d)       all of the above

(e)       No effect on testing

27) A hydrometer is used to measure:

(a)       Penetrant viscosity

(b)       Specific gravity of water based wet developers

(c)        Penetrant specific gravity

(d)       Cleaner specific gravity

28) The penetrant should have

(a)       low flash point

(b)       high flash point

(c)        variable flash point

(d)       not define

29) The indications that should be consider:

(a)       relevant

(b)       nonrelevant

(c)        false

(d)       all of the above

30) Materials that are chemically active can examine with pt?

(a)       not examine

(b)     Yes examine

(c)       before examine, insure that materials sample not react/effected by pt materials

(d)      none of the above

31) Why might steel parts have a greater tendency towards rusting after penetrant testing?

(a)       Penetrant materials are normally corrosive

(b)       Penetrant materials residues are hydroscopic

(c)        Any protective oils are removed during penetrant testing

(d)       This is true only if the developer and penetrant residues are not removed after testing

32) Desire properties of penetrant materials used for the inspection medium for material is that they:

(a)       less nontoxic

(b)       high flash point

(c)        odorless

(d)       all of the above

33) Which type of developer should not be used with a visible dye penetrant process?

(a)       Dry

(b)       Non-aqueous wet

(c)        Water soluble

(d)       Water suspendable

34) Dual purpose penetrants are viewed under what type of light?

(a)       White light

(b)       Black light

(c)        Both a and b

(d)       None of the above

35) When using solvent removable penetrants, the excess penetrant may be removed by:

(a)       dipping the part in solvent

(b)       spraying the part with water and a solvent

(c)        rubbing the part with a wet rag

(d)       wiping the part with rage or cloth that has been lightly moistened with solvent

36) Which of the following is the most sensitive developer in descending order?

(a)       Dry, water soluble, water suspendable

(b)       Non-aqueous wet, water soluble, water suspendable dry

(c)        Non-aqueous wet, dry, water soluble

(d)       Water suspendable, water soluble, non-aqueous wet

37) What are the two most important properties in determining the penetrating ability of a penetrant?

(a)       Viscosity and surface tension

(b)       Viscosity and contact angle

(c)        Surface tension and wetting ability

(d)       None of the above

38) The fluorescent dyes used in the liquid penetrant testing process are most active when energized with black light of what wavelengths? (Å stands for angstrom units)

(a)       2.0 × m (2000 Å)

(b)       2.5 ×  m (2500 Å)

(c)        3.25 ×  m (3250 Å)

(d)       3.65 ×  m (3650 Å)

39) The act of determining the cause of an indication is called

(a)       Interpretation

(b)       Inspection

(c)        Evaluation

(d)       Determination

40) How many of types of penetrant generally use:

(a)       One type

(b)       two types

(c)        three types

(d)       four types