NDT Nondestructive Testing Methods & Techniques 4

Question 1

What is the function of the 'developer' step in liquid penetrant testing?

Accepted Answer

To draw entrapped penetrant out of discontinuities and create a visible indication

Answer

Developer acts as a blotter that draws trapped penetrant out of discontinuities by capillary action, spreading it to form a visible indication against the developer background.

Question 2

Which ASME code section specifically governs the nondestructive examination requirements for pressure vessels?

Accepted Answer

ASME Section V — Nondestructive Examination

Answer

ASME Section V provides the methods, procedures, and requirements for NDE techniques used in pressure vessel and boiler inspection programs.

Question 3

A boilermaker inspector finds a linear indication on a weld radiograph that is parallel to the weld axis and located at the weld centerline. This is most likely indicative of:

Accepted Answer

Centerline cracking or lack of fusion along the weld root

Answer

A linear indication parallel to and centered on the weld axis suggests centerline hot cracking or incomplete fusion along the root, both critical planar defects.

Question 4

In ultrasonic testing, 'attenuation' refers to:

Accepted Answer

The loss of sound energy as the beam travels through the material due to absorption and scattering

Answer

Attenuation is the progressive reduction of ultrasonic energy as the beam travels through material, caused by absorption (heat conversion) and scattering at grain boundaries.

Question 5

What is the primary advantage of phased array ultrasonic testing (PAUT) over conventional single-element UT in weld inspection?

Accepted Answer

PAUT can electronically steer and focus the beam without moving the probe, improving coverage and speed

Answer

Phased array systems use multiple elements fired at controlled time delays to steer and focus the ultrasonic beam electronically, enabling rapid volumetric weld inspection without mechanical scanning.

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

NDT Nondestructive Testing Methods & Techniques 4