Quiz 4: Magnetic Particle Testing

1. Circular magnetization is useful for the detection of:

• a. Circular Cracks

• b. Longitudinal Fractures

• c. Transverse Fractures

• d. All of the above

The best technique for locating deep-lying defects (1/8 in.) makes use of:

• a. Alternating Current

• b. Direct Current (battery)

• c. Half-wave Current

• d. High Voltage Current

For a given current passed through a part, increasing the diameter of the part will __________________ the field strength at the surface.

• a. Increase

• b. Decrease

What is the proper amperage for a circular field?

Part length = 46 in.

Part diameter = 3 in.

Number of coil turns = 5

What is the proper amperage for a longitudinal field?

Part length = 46 in.

Part diameter = 3 in.

Number of coil turns = 5

How many coil shots are necessary?

Part length = 46 in.

Part diameter = 3 in.

Number of coil turns = 5

To examine for longitudinal fractures on the inside diameter surface of a thick, hollow shaft you would:

• a. Pass current through it

• b. Insert it in a solenoid

• c. Pass current through a central conductor

• d. Pass current through a solenoid at its center

Demagnetization of a part is not necessary if:

• a. The part is small

• b. The continuous method is employed

• c. The part is high carbon steel

• d. The part is to be heat treated (above its curie point)

Prod spacing should be between:

• a. 6 - 10 inches

• b. 1 - 8 inches

• c. 3 - 8 Inches

• d. 10 - 15 inches

The type of field established by an electromagnetic yoke is a:

• a. Longitudinal Field

• b. Circular Field

• c. Vector Field

• d. Meridional Field