NDT NDE ASNT Questions and answers for PT, LPI level II (3).

9. The height of capillary rise of the liquid or the depth to which penetrant enters, is more in the case of
a. Wide and shallow discontinuities
b. Narrow and deep discontinuities (answer)
c. More information is required
d. Determined by contact angle and surface tension

10. A liquid in a capillary tube has a concave surface
a. The liquid has high surface tension (answer)
b. Low surface tension
c. More information is required
d. The liquid is a Penetrant

11. Which of the following is true of flash point consideration in liquid Penetrant inspection?
a. Flash point affects the performance of a penetrant
b. Flash point is important as a safety precaution flash point shall be high for open tanks (answer)
c. Flash point shall be low for penetrant open tanks
d. Flash point is maintained high for penetrant in aerosol containers

12. Normally mechanical methods of cleaning the surface prior to the PT are not advisable. However if mechanical methods are adopted the treatment to be followed is,

a. Thorough washing with water
b. Vapour degreasing
c. Alkaline cleaning
d. Etching (answer)

13. Oil and grease need be removed from the surface prior to PT since

a. Oil and grease may affect the contact angle and surface tension of penetrants
b. May occupy the discontinuity to some extent
c. May fluoresce under black light
d. A&B of the above (answer)
e. A,B & C of the above

14. Which of the following describes the effect if pre cleaning is not done properly?
a. It will restrict the bleed out of the penetrant to form indication
b. It will restrict the entry of the penetrant into the discontinuity
c. It reduces the wetting of the test object surface by penetrant
d. All of the above (answer)

15. Which of the following is generally the more acceptable method for cleaning parts prior to Penetrant testing?
a. Sand blasting
b. Wire brushing
c. Grinding
d. Vapor degreasing (answer)

16. An ideal Penetrant should have
a. Low surface tension, low viscosity, low contact angle
b. High surface tension, low viscosity, low contact angle (answer)
c. High surface tension, high viscosity, low contact angle
d. High surface tension, low viscosity, high contact angle
e. High surface tension, high viscosity, high contact angle

Additional questions:

11. Which of the following is a discontinuity that might be found in forging?
A. Shrinkage crack
B. Lap
C. Hot tear
D. Lamination
12. Aluminum alloy test specimens that have tested by liquid penetrant method should be thoroughly cleaned after testing because:
A. The acid in the penetrant may cause severe corrosion
B. The alkaline content of wet developer and most emulsifiers could result in surface pitting, particularly in moist atmospheres.
C. The toxic residue from the test will severely inhibit the application of paint on aluminum alloys
D. A chemical reaction between the penetrant and aluminum could cause a fire because of internal combustion.
13. The penetrant indication of a cold shut on the surface of a casting will be:
A. A dotted or smooth continuous line
B. A cluster of small indications
C. A rough deep indication
D. A large bulbous indication
14. Which of the following statements concerning contaminating materials on the surface of a part to be penetrant tested is not true?
A. The contaminant may be of a composition that attacks the penetrant and reduces the fluorescent or color of the penetrant
B. The contaminants may be of such a nature that they 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
15. Which of the following is a discontinuity that might be found in rolled plate stock?
A. Shrinkage cracks
B. Inclusions
C. Forging laps
D. Blow holes
16. When performing a liquid penetrant test using solvent removable dye penetrant, ther are several ways to remove excess penetrant from the surface of the part. Which of the methods listed below generally regarded as most suitable for giving accurate test results?
A. Squirting solvent over the surface with no more than 40 psi pressure
B. Wiping with a soaking wet cloth, then wiping with a dry cloth
C. Wiping with a solvent dampened cloth, then wiping with dry cloths
D. Wiping with dry paper wipes, then wiping with a solvent dampened cloth, and finally wiping with dry cloth
17. When conducting a penetrant test , spherical indications on the surface of a part could be indicative of:
A. Fatigue cracks
B. Porosity
C. Weld laps
D. Hot tears
18. Which of the following discontinuities might be found in a welded fabrication?
A. Shrinkage
B. Lack of fusion
C. Seams
D. Laps
19. Which of the statements below concerning the operation of the black light bulbs of the mercury arc type is not true?
A. It takes about 5 minutes for the bulb to warm up to its full output when first turned on
B. The lamp may go out if the line voltage drops below 90 volts
C. Line voltage variations above 120 volts will have little or no effect on the bulb
D. If for any reasons the arc is extinguished, the bulb will not immediately respond if the lamp is turned on right after it has been turned off.
20. Which of the statements below apply to the liquid penetrant method of testing?
A. The penetrant test method is less flexible than eddy current test method
B. The penetrant test method is less reliable than the magnetic particle method for finding surface defects in ferromagnetic materials.
C. The penetrant test method will not detect fatigue cracks.
D. The penetrant test method is more reliable tha radioraphic testing when attempting to detect minute surface discontinuities.

One thought on “NDT NDE ASNT Questions and answers for PT, LPI level II (3).

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s