Non-Destructive Testing: Sample Questions for Conduct of Examinations at NDT PT Levels -1

Liquid Penetrant Testing Level -1 (PT-1) General Examination Part-2

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PT Level 1 :: NDT Mock Test Practice Quiz MCQ’s Part-2

1.

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

  Absence of red indications on the test piece surface

  Clean rinse water

  Completion of the rinse cycle

  Absence of red dye on the cleaning towels

2.

Which penetrant process should be used if repeated examinations are anticipated?

  Solvent removable.

  Water washable

  Post emulsifiable

  Fluorescent

3.

Which of the following is a function of a developer?

  Providing a contrasting background for visible dye indications

  Making the penetrant water washable

  Penetrating into discontinuities open to the surface

  Dissolve organic soils on the test piece surface

4.

Which of the following metals must be tested with low halogen sulfur-free penetrant materials:

  Copper, silver, gold

  Nickel based alloys, certain stainless steel materials

  Steel, iron, aluminum

  Plastic, wood, paper

5.

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What is the minimum time considered necessary for the dark adaptation of the eyes prior to evaluating the results of a fluorescent penetrant test?

  1 minute

  2 minutes

  5 minutes

  10 minutes

6.

Low sulphur and chlorine penetrant materials would be used for testing:

  Aluminium, steel, and plastics

  Tool steels, chrome vanadium steel, and ferritic stainless steels

  Austenitic stainless steels, nickel alloys, and titanium

  Magnetic materials

7.

The limitation of a liquid penetrant test is:

  Only surface breaking discontinuities can be detected if chemically and physically clean and dry

  Porous materials cannot be tested

  There is a cleaning problem following a penetrant inspection in some cases

  All of the listed limitations are correct

8.

The purpose of using a developer is:

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

  Assists in reverse capillary action due to absorption ability of developers

  Prevent the part from corroding after the liquid penetrant test

  To ensure that the part has been correctly heat treated

9.

When performing a fluorescent penetrant examination, excess penetrant is normally removed:

  By a hydrophilic scrubber

  Under UV light

  By solvent spray

  By vapour degreasing

10.

The advantages of using a visible solvent removable penetrant versus a post emulsified fluorescent penetrant is:

  No UV light is needed

  The technique is well suitable for site tests or spot checks

  No water or emulsifiers are needed

  No extra equipment is needed

11.

Which of the following developers is applied by brush, spraying, or dipping?

  Non-aqueous wet

  Water-based wet

  Dry

  Dual sensitivity

12.

Which type of penetrant process would be best suited to the detection of wide, shallow discontinuities?

  Solvent removable

  Water washable

  Post emulsifiable

  Fluorescent

13.

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Liquid penetrants can be further categorized by the removal method of excess surface penetrant:

  Water washable

  Solvent removable

  Post emulsified

  All of the above

14.

Which penetrant process is the most sensitive to detect fine discontinuities?

  Solvent removable

  Water washable

  Post emulsifiable fluorescent

  Water washable fluorescent

15.

The typical causes for false indications are:

  Threads, keyways, splines, rough surfaces

  Sharp corners, pop rivets

  Insufficient removal of excess surface penetrant, penetrant on operators’ hands, using cloth/paper towels which are not lint-free, dirty work surfaces

  Over-washing with high-pressure hose pipes

16.

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

  Steam cleaning, etching, rust, and paint removal

  Solvent wipe, vapour degreasing, ultrasonic bath cleaning

  Blasting, grinding, filing, honing, machining

  All of the listed methods are not recommended

17.

Which of the following types of penetrants, developers, solvents are used when conducting a liquid penetrant test on a part that is exposed to a liquid oxygen environment.

  Water-based penetrants

  Water-based developers

  Water-based solvents

  All of the above

18.

What is the likely result of looking directly into a black light?

  Burning of the retina of the eye

  Temporary inflammation of the cornea

  Long term tendency toward formation of cataracts

  Fluorescence of the fluid in the eye

19.

What is the disadvantage of using the fluorescent penetrant process?

  Lower visibility of indications

  Must be performed in a darkened area with aid of a UV lamp

  Easily washed with water

  High visibility of indications

20.

The temperature of water rinse used in the water washable penetrant process should be:

  60 to 110°C

  40 to 100°C

  16 to 43°C

  70 to 140°C

21.

Which of the following developers is applied by spray only?

  Non-aqueous wet

  Water-based wet

  Dry

  Dual sensitivity

22.

The most sensitive type of developer for the detection of fine discontinuities is:

  Water soluble

  Non-aqueous wet

  Dry

  Water suspendable

23.

Penetrant testing is limited by its inability to test which of the following materials:

  Aluminium

  Ceramics

  Porous materials

  Moulded rubber

24.

Which penetrant process is best suited to detect shallow discontinuities?

  Solvent removable

  Water washable

  Post emulsifiable

  Fluorescent

25.

Which type of penetrant process is least susceptible to over washing?

  Solvent removable

  Water washable

  Post emulsifiable

  Fluorescent

26.

Which type of penetrant process affords most control of test sensitivity level?

  Solvent removable

  Water washable

  Post emulsifiable

  Fluorescent

27.

Which of the following penetrant has a built-in emulsifier?

  Water washable

  Solvent removable

  Post emulsified

  All of the listed above

28.

Which of the following is a function of a developer?

  Providing a contrasting background for visible dye indications

  Accentuates presence of discontinuities by causing a penetrant indication to spread out over a larger area

  Provides capillary paths to aid the bleed out process

  All of the above

29.

What is a disadvantage of the solvent removable penetrant process?

  It is the least sensitive of the penetrant processes

  It is not well suited for use on rough surfaces

  It is highly portable

  No water is required for its use

30.

Liquid penetrants can be classified into the types of dyes they contain:

  Visible/colour contrast

  Fluorescent

  Dual sensitivity

  All of the listed is correct

31.

Which type of developer may be either in suspension or a solution?

  Dry

  Non-aqueous wet

  Water based wet

  None of the above

32.

Cracks, lack of penetration, lack of fusion which is surface breaking on a welded aluminum plate that has been liquid penetrant tested will show as:

  Linear indications

  Rounded indications

  Square indications

  Triangular indications

33.

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

  Dry, water-soluble, water suspendable

  Non-aqueous wet, water-soluble, water suspendable, dry

  Non-aqueous wet, dry, water-soluble

  Water suspendable, water-soluble, non-aqueous wet

34.

The danger of over washing during a water-washable penetrant test is that:

  Excess penetrant will be removed from the test piece

  Penetrant will be removed from discontinuities

  The wastewater will contain too high a concentration of penetrants

  A protective oxide coating on the test piece is formed

35.

Liquid penetrants can be further categorized by the removal method of excess surface penetrant:

  Water washable

  Solvent removable

  Post emulsified

  All of the above

36.

Surface breaking porosity will show what type of relevant indications when a welded aluminum plate is tested with the liquid penetrant method:

  Linear indications

  Square indications

  Triangular indications

  Rounded indications

37.

The following precautions must be observed when removing the excess surface penetrant with a water wash method using a hosepipe:

  The wash angle should be at 45°

  A coarse droplet spray

  Temperature of water 16 to 43°C

  Pressure as low as possible not to exceed 50 psi

38.

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

  60 to 100ºC

  10 to 60ºF

  16 to 52ºC

  10 to 20ºK

39.

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

  Solvent removable

  Water washable

  Post emulsifiable

  Fluorescent

40.

Which of the following developers is applied before the drying operation?

  Dry

  Non-aqueous wet

  Water based wet

  None of the above

41.

Which penetrant process is best suited to the detection of discontinuities in a test piece having threads and keyways?

  Solvent removable

  Water washable

  Post emulsifiable

  Fluorescent

42.

Penetrants may be applied to the surface of the part by :

  Spraying

  Dipping

  Pouring

  All of the above methods are acceptable

43.

Which penetrant process is best suited for portable application in the field?

  Solvent removable

  Water washable

  Post emulsifiable

  Fluorescent

44.

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

  A water spray

  A hydrophilic scrubber

  A solvent spray

  Clean with lint-free towels moistened with solvent

45.

The causes of nonrelevant indications are:

  Insufficient removal of excess surface penetrant

  Penetrant on operators hands

  Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces

  Contaminated work surfaces

46.

Which of the following is the proper first step in the removal of excess penetrant when using the solvent removable penetrant process?

  Immerse the test piece insolvent

  Spray the test piece with water

  Wipe the test piece surface with clean, lint-free towels slightly moistened

  All of the above is correct

47.

The typical sequence of conducting a visible solvent removable penetrant is:

  Pre-clean with a solvent wipe method

  Apply visible penetrant, keep wet, dwell time of 2 minutes

  Pour solvent on the surface of the part and wipe with waste cloth

  Spray on a thick layer of the developer

48.

The principle on which liquid penetrant testing is based is:

  Capillary action of the penetrant

  Capillary action of cleaner/solvent

  Capillary action of the developer

  None of the listed is correct

49.

Which of the following developers is applied by immersion or flow only?

  Non-aqueous wet

  Water-based wet

  Dry

  Dual sensitivity

50.

Which of the following is a reason to post clean apart after a liquid penetrant test?

  The part might be further processed

  If repairs are necessary

  Developers absorb moisture which may result in part being corroded

  All of the reasons are correct

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