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Why are magnetic particles available in different colors?

• For color contrast with the part surface.
• To enhance the detection of indications
• For both A and B
• Different colors are used with different magnetic flux values.

If one-inch and two-inch diameter bars were magnetized by passing the same current through them, the magnetic fields would be

• The same for both.
• Stronger in the two-inch diameter bar.
• Weaker in the one-inch diameter bar
• Stronger in the one-inch diameter bar.

A prime consideration when selecting a powder to be used as a magnetic particle medium is to select a powder that

• Provides a high contrast to the surface being tested.
• Provides a low contrast to the surface being tested.
• Will adhere to the surface being tested
• Requires a high demagnetization current to remove it.

Which of the following will produce circular magnetism?

• Passing current through a coil
• Placing the test part in a solenoid
• Passing current through prods
• None of the above.

What Historical Rule describes the direction of current flow (+ to -) when lines of magnetic force surround a conductor?

• Left hand rule
• Right hand rule
• Flux rule
• Reluctance rule

An electric current through a copper wire

• Creates a magnetic field around the wire.
• Creates a longitudinal magnetic field in the wire.
• Magnetizes the wire.
• Does not create a magnetic field.

The size of most dry powder magnetic particles used in general flaw detection is

• Less than 2 microns in any dimensiomn
• About 3000 to 4000 microns
• A mixture of shapes and sizes
• Not a consideration in the test method

What is the minimum intensity of black light required for magnetic particle inspections using fluorescent particles? At what distance?

• 1000 W/cm? @ 38cm (15")
• 1000 lux/cm? @ 38cm (15")
• 1000 ft.cdls/cm? @ 38cm (15")
• 1000 Mw/cm? @ 38cm (15")

What is the minimum intensity of white light required for critical inspections using visible magnetic particle inspection methods? ( Provide answers in lux or foot-candles)

• 1000 µW/cm? @ 38cm (15")
• 1000 lux/cm² @ 38cm (15")
• 1000 ft.cdls/cm² @ 38cm (15")
• 1000 Mw/cm² @ 38cm (15")

The minimum acceptable particle concentration for wet fluorescent magnetic particle inspection is

• 1.2 ml to 2.4 ml per 100 ml of vehicle
•  0.1 ml to 0.4 ml per 100 ml of vehicle
•  Both A and B are acceptable
• Neither A or B are acceptable

The acceptable concentration limit for wet visible magnetic particle inspection is

• 1.2 ml to 2.4 ml per 100 ml of vehicle
• 0.1 ml to 0.4 ml per 100 ml of vehicle
• Both A and B are acceptable
• Neither A or B are acceptable

What type of test is used to measure the performance of an AC yoke?

• Lifting test. The AC yoke must lift at least 4.5 kg (10 lbs).
• Lifting test. The AC yoke must lift at least 18 kg (40 lbs).
• Lifting test. Using AC, yoke must lift at least 9 kg (20 lbs).
• Lifting test. Using DC, yoke must lift at least 4.5 kg (10 lbs).

What is the test used to measure the performance of a DC yoke?

• Lifting test. The DC yoke must lift at least 4.5 kg (10 lbs) b Lifting test. 
• Lifting test. The DC yoke must lift at least 18 kg (40 lbs).
• Lifting test. The DC yoke must lift at least 9 kg (20 Ibs).
• Lifting test. The AC yoke must lift at least 4.5 kg (10 lbs).

The name of the container used to measure the concentration of the bath used in the wet method is

• Centrifuge tube
• Beaker
• Graduated cylinder
• Test tube

When doing the settling test, what should you do if clumping of the particles occurs?

• Replace the particles
• Replace the vehicle
• Demagnetize the bath
• Demagnetize the suspension in the tube

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