FREE CWI Non-Destructive Testing (NDT) Questions and Answers

Question 1

Which NDT method is MOST suitable for detecting very fine, surface-breaking discontinuities in non-ferromagnetic materials such as aluminum or austenitic stainless steel?

Accepted Answer

Liquid Penetrant Testing (PT)

Answer

Magnetic Particle Testing (MT)

Answer

Radiographic Testing (RT)

Answer

Ultrasonic Testing (UT)

Question 2

A CWI is tasked with inspecting a new weld on a pressure vessel for internal flaws. The weld is thick, and the material is a common carbon steel. Which NDT method would be the MOST appropriate choice for detecting subsurface discontinuities like lack of fusion, slag, or porosity throughout the weld volume?

Accepted Answer

Ultrasonic Testing (UT)

Answer

Visual Inspection (VT)

Answer

Eddy Current Testing (ET)

Answer

Dye Penetrant Testing (PT)

Question 3

When performing Magnetic Particle Testing (MT) on a weld, what is the primary reason for ensuring the part is demagnetized after the inspection, especially if it's a critical component?

Accepted Answer

To avoid interference with subsequent welding operations or instruments.

Answer

To prevent corrosion of the component.

Answer

To improve the aesthetic appearance of the component.

Answer

To increase the material's hardness.

Question 4

Which of the following NDT methods utilizes differences in electrical conductivity or magnetic permeability to detect surface and near-surface discontinuities?

Accepted Answer

Eddy Current Testing (ET)

Answer

Radiographic Testing (RT)

Answer

Acoustic Emission Testing (AET)

Answer

Leak Testing (LT)

Question 5

A CWI is inspecting a large storage tank for through-wall leaks. The tank contains a liquid and is not pressurized. Which NDT method would be MOST effective for locating the exact point of a leak on the tank's exterior surface?

Accepted Answer

Bubble Leak Testing (BLT)

Answer

Visual Inspection (VT)

Answer

Magnetic Particle Testing (MT)

Answer

Radiographic Testing (RT)

Question 6

During a Liquid Penetrant Testing (PT) inspection, a CWI observes several small, distinct indications that appear as bright, round spots after applying the developer. These indications are MOST likely representative of which type of discontinuity?

Accepted Answer

Porosity

Answer

A linear crack

Answer

Lamination

Answer

Lack of fusion