Magnetic Particle Test Quiz

What is the primary purpose of magnetic particle inspection?

• To measure the thickness of materials

• To detect near-surface defects in ferromagnetic materials

• To test the electrical conductivity of materials

• To determine the chemical composition of materials

What is the first step in the practical procedure of magnetic particle inspection?

• Observing the test piece under ultraviolet light

• Turning on the electromagnet

• Applying the suspension of magnetic particles

• Inserting the test piece between the poles of an electromagnet

Why are dark lines visible on the test piece under ultraviolet light?

• Because the test piece is made of a special material

• Because the magnetic particles fluoresce under ultraviolet light

• Because the magnetic particles are heated

• Because the electromagnet is turned off

What happens to the magnetic particles in areas free from defects?

• They run off

• They change color

• They cluster together

• They fluoresce brightly

What is a leakage field?

• A field where the magnetic field lines run parallel to the surface

• A field where magnetic particles are attracted and clustered

• A field where the magnetic field lines are absent

• A field where magnetic particles are repelled

Why must the magnetic field lines be perpendicular or at a certain angle to the defect?

• To ensure the magnetic particles fluoresce

• To create a leakage field

• To make the test piece visible under daylight

• To prevent the magnetic particles from running off

What direction are the magnetic field lines when the sample is magnetized horizontally?

• Diagonally

• Horizontally

• Vertically

• Circularly

What method is used to magnetize the sample perpendicularly to the first time?

• Optical method

• Current flow method

• Thermal method

• Electromagnetic induction method

What type of cracks were detected in the hardened sliding guide?

• Corrosion cracks

• Fatigue cracks

• Thermal cracks

• Grinding cracks

What caused the fatigue cracks in the large gear wheel?

• Excessive load

• Overheating during operation

• Mismatched gear wheels

• Improper lubrication