Liquid Penetrant Testing

Question 1

What is the tendency of a liquid penetrant to enter a discontinuity primarily related to?

A. The viscosity of the penetrant

B. Capillary action

C. The chemical inertness of the penetrant

D. The specific gravity of the penetrant

Answer 1

1) - B

Question 2

PT is a nondestructive test method that can be used for:

A. locating and evaluating all types of discontinuities in a test specimen.

B. locating and determining the length, width, and depth of discontinuities in a test specimen.

C. determining the tensile strength of a test specimen.

D. locating discontinuities open to the surface.

Answer 2

2) - D

Question 3

Which of the following processes is best situated to detect shallow discontinuities?

A. Postemulsifiable

B. Solvent-removable

C. Aqueous developer

D. Water-washable

Answer 3

3) - A

Question 4

What is it called when a dye in penetrant materials gives off visible light after being exposed to ultraviolet light?

A. Emissivity

B. Irradiation

C. Spectrum blocking

D. Fluorescence

Answer 4

4) - D

Question 5

When using a fluorescent, postemulsifier penetrant, the optimum dwell time for high viscosity emulsifiers is typically:

A. 10 seconds.

B. 5 seconds.

C. determined by experimentation.

D. 2 to 3 minutes.

Answer 5

5) - D

Question 6

A red penetrant indication against white background is most likely to be seen when:

A. dry developers are used.

B. visible dye penetrants are used.

C. fluorescent postemulsified penetrants are used.

D. ultraviolet light is used with visible dye penetrants.

Answer 6

6) - B

Question 7

The most widely accepted technique for removing excess water-washable penetrant is:

A. using a wet rag.

B. using a coarse water spray rinse.

C. washing directly under running tap water.

D. immersing the part in water.

Answer 7

7) - B

Question 8

Which PT system is generally considered the least sensitive?

A. Water-washable; visible dye

B. Solvent-removable; visible dye

C. Water-washable; fluorescent dye

D. Postemulsified; visible dye

Answer 8

8) - A

Question 9

Best technique for accurate results when removing solvent-removable visible dye penetrant:

A. Squirting solvent ≤69 kPa (10 psi)

B. Wiping with solvent-soaked cloth then dry cloth

C. Wiping with solvent-dampened cloth then dry cloth

D. Wiping with dry cloths then solvent-dampened cloth then dry cloth

Answer 9

9) - D

Question 10

Problem with retesting previously PT-tested specimen:

A. penetrant residue may not dissolve and retest misleading.

B. penetrant may form beads.

C. penetrant loses color brilliance.

D. penetrant intensifies residue making indications large.

Answer 10

10) - A

Question 11

Common performance check of PT system:

A. determine viscosity

B. measure wettability

C. compare artificially cracked specimens

D. check contaminant levels

Answer 11

11) - C

Question 12

Emulsifier function in postemulsified penetrant:

A. influence penetration rate

B. react with surface penetrant to make washable

C. add dye or pigment

D. emulsify oils and greases

Answer 12

12) - B

Question 13

Developers in PT:

A. normally highly fluorescent

B. some create fluctuating background

C. blot penetrant from discontinuities

D. nonaqueous best for humid environments

Answer 13

13) - C

Question 14

Cold shut indication:

A. dotted line

B. large bulbous indication

C. smooth continuous line

D. undetectable

Answer 14

14) - C

Question 15

Crack-type indication:

A. rounded

B. continuous straight or jagged line

C. broad fuzzy

D. random holes

Answer 15

15) - B

Question 16

Scattered round indications indicate:

A. fatigue cracks

B. porosity

C. weld laps

D. hot tears

Answer 16

16) - B

Question 17

Typical nonrelevant indications:

A. geometry or design configs

B. nonmagnetic indications

C. contact with other object

D. low-stress area indications

Answer 17

17) - A

Question 18

Effect of sandblasting before PT:

A. may close discontinuities

B. oil contaminants sealed in

C. sand forced into discontinuity

D. may introduce discontinuities

Answer 18

18) - A

Question 19

Forging lap indication:

A. round

B. cluster

C. thin continuous line

D. dotted line

Answer 19

19) - C

Question 20

Aluminum PT specimens must be cleaned because:

A. acid causes corrosion

B. oily residue prevents paint adhesion

C. reaction may cause fire

D. alkalines may cause pitting

Answer 20

20) - D

Question 21

Discontinuity in rolled bar stock:

A. blow holes

B. shrinkage laps

C. stringers or seams

D. insufficient penetration

Answer 21

21) - C

Question 22

Anodized surfaces poor for PT because:

A. smooth and slick

B. many small pores

C. alkaline residue quenches penetrant

D. cannot be cleaned

Answer 22

22) - B

Question 23

PT technique without electricity:

A. water-washable fluorescent

B. postemulsified fluorescent

C. visible dye penetrant

D. hydrophilic fluorescent

Answer 23

23) - C

Question 24

PT of rough welds:

A. postemulsified advantageous

B. solvent-removal best with aqueous developer

C. cannot test rough welds

D. may need grinding smooth

Answer 24

24) - A

Question 25

Penetrant must: A. change viscosity to spread B. spread easily C. low flash point D. change color to fluoresce

Answer 25

25) - B

Question 26

In-service discontinuity: A. grinding cracks B. porosity C. stress-corrosion crack D. cold lap

Answer 26

26) - C

Question 27

Penetrant qualified to spec: A. AMS 2642 B. AMS 2644 C. AMS 2646 D. AMS 2648

Answer 27

27) - B

Question 28

Penetrants removable with water: A. Method A B. Method B C. Method C D. Method D

Answer 28

28) - A

Question 29

Fluorescent dye penetrant color: A. red B. yellow-green C. orange D. blue

Answer 29

29) - B

Question 30

Important for field PT weld inspection: A. weld temperature B. crack may be oxide-filled blocking penetrant C. wind conditions D. crack orientation

Answer 30

30) - B