NDT Liquid Penetrant Testing Process 4

Question 1

Which of the following materials CANNOT be reliably inspected using liquid penetrant testing?

Accepted Answer

Porous sintered bronze bushings

Answer

Porous materials trap penetrant throughout their bulk, making it impossible to distinguish relevant indications from background bleed-out.

Question 2

What is the function of the emulsifier in a post-emulsifiable penetrant system?

Accepted Answer

It makes the excess surface penetrant water-washable without affecting penetrant in discontinuities

Answer

The emulsifier combines with surface penetrant to allow water rinsing while leaving penetrant locked in discontinuities if contact time is controlled carefully.

Question 3

Which environmental condition in the inspection area is MOST critical to control for fluorescent penetrant testing?

Accepted Answer

Ambient white light level (should be ≤2 fc)

Answer

Ambient white light must be ≤2 foot-candles (≤20 lux) in the inspection area so fluorescent indications are not washed out and remain clearly visible.

Question 4

A rounded indication in liquid penetrant testing is MOST likely associated with which type of discontinuity?

Accepted Answer

A subsurface void or porosity cluster

Answer

Rounded indications typically correspond to porosity or globular inclusions, where the defect opening is roughly equal in all directions.

Question 5

What is the maximum surface temperature typically allowed for standard penetrant materials per ASTM E1417?

Accepted Answer

125°F (52°C)

Answer

ASTM E1417 specifies a normal operating range of 40–125°F (4–52°C) for standard penetrant materials; special high-temperature products are needed above that.

NDT - Non-Destructive Testing Practice Test

NDT - Non-Destructive Testing Practice Test

NDT Liquid Penetrant Testing Process 4