NDT - Non-Destructive Testing Magnetic Particle Testing Methods Questions and Answers

Question 1

An inspector is using the wet continuous method to perform a magnetic particle test on a steel weld. At which point should the application of the magnetic particles be stopped?

Accepted Answer

Just before the magnetizing current is turned off

Answer

After the magnetizing current is turned off

Answer

Just before the magnetizing current is turned on

Answer

Simultaneously with turning the magnetizing current off

Question 2

Which of the following magnetization methods is most effective for detecting transverse discontinuities in a long, solid cylindrical bar?

Accepted Answer

Longitudinal magnetization using a coil

Answer

Circular magnetization using prods

Answer

Circular magnetization using a central conductor

Answer

Longitudinal magnetization using a yoke on the end

Question 3

When inspecting a large casting with a rough surface for potential surface-breaking cracks, which magnetic particle testing method and particle type combination would be most suitable?

Accepted Answer

Dry powder method

Answer

Wet fluorescent method

Answer

Wet visible method on a light-colored part

Answer

Residual method with wet particles

Question 4

A technician is tasked with performing a magnetic particle inspection on a critical aerospace component made of a high-strength steel alloy. The procedure specifies using the residual method. This implies that the material must have:

Accepted Answer

High permeability and high retentivity

Answer

Low permeability and low retentivity

Answer

High permeability and low retentivity

Answer

Low permeability and high retentivity

Question 5

Which of the following is a significant disadvantage of using the prod technique for inducing a circular magnetic field?

Accepted Answer

It has a high risk of causing arc strikes or localized overheating.

Answer

It is only suitable for detecting transverse defects.

Answer

It cannot be used on large or irregularly shaped parts.

Answer

It is the least portable of all magnetic particle methods.

Question 6

Demagnetization of a component after magnetic particle testing is crucial in which of the following scenarios?

Accepted Answer

When the part is a moving component in an assembly, like a bearing.

Answer

When the part is to be immediately painted.

Answer

When the part is made of low-carbon steel with low retentivity.

Answer

When the part will be subsequently heat-treated above the Curie point.