CWI Nondestructive Examination Methods 3

Question 1

What is the primary limitation of liquid penetrant testing (PT)?

Accepted Answer

It is limited to surface-breaking discontinuities only

Answer

PT relies on capillary action and can only detect discontinuities that are open to the surface.

Question 2

In ultrasonic shear wave testing, the refracted shear wave angle is produced using which principle?

Accepted Answer

Snell's Law

Answer

Snell's Law describes the relationship between the incident angle and the refracted wave angle at a material interface.

Question 3

A CWI is reviewing a radiograph and sees a dark, elongated linear indication with fuzzy edges. This is most likely caused by:

Accepted Answer

Slag inclusion

Answer

Slag inclusions typically appear as dark, elongated indications with irregular or fuzzy edges on a radiograph.

Question 4

When using the wet continuous method of magnetic particle testing, the particles are applied:

Accepted Answer

While the magnetizing current is flowing

Answer

In the wet continuous method, particles are applied while the magnetizing current is flowing to maximize particle mobility and indication formation.

Question 5

What does the term 'impedance plane' refer to in eddy current testing?

Accepted Answer

A graphical display showing the relationship between resistance and inductive reactance

Answer

The impedance plane is a 2D display (X vs. Y) that plots the resistive and reactive components of the probe's impedance to characterize material conditions.

CWI Practice Test

CWI Practice Test

CWI Nondestructive Examination Methods 3