1

 

An object that has a magnetic pole on one end and a second equal but opposite magnetic pole on the other is called a:

Dipole

Inductor

Capacitor

A ferromagnetic material

 

2

 

A material is considered demagnetized when:

Its residual magnetic field measures less than 5 gauss

It no longer produces an indication

It's no longer attracted to a magnet

Its residual magnetic field measures less than 3 gauss

 

3

 

Faraday’s Law of Magnetic Induction states that:

The flow of electrons can be used to generate a magnetic field

The magnetic forces of the material's electrons will be affected by an external magnetic field

Iron filings can be used to produce an indication of a flaw

Flux leakage is the byproduct of magnetic fields when testing aluminum alloys.

 

4

 

The force required to remove the residual magnetism from the material is called the:

Inverse force

Reciprocal force

Coercive force

Residual force

 

5

 

Which type of current flows continuously in one direction at a constant voltage?

Direct current

Alternating current

Rectified alternating current

Half wave rectified alternating current

 

6

 

A material with a wider hysteresis loop has:

Higher reluctance

Higher permeability

Lower retentivity

All of the above

 

7

 

When the magnetizing current is stopped, a ferromagnetic material will:

remain magnetically saturated

become demagnetized

retain a residual magnetic field withing the component

None of the above

 

8

 

Dry magnetic particles:

Cannot be reused

Come in only one color

Are all of uniform size

None of the above

 

9  Magnetic lines of force:

Almost never cross each other

Commonly cross each other

Will shift 90 degrees when a direct current is applied

Never cross each other

 

10

 

Magnetic particle inspection uses small ferromagnetic particles simmilar to:

Copper filing

Iron filings

Magnesium filings

Permanent Magnets

 

11

 

Magnetic lines of force:

Form closed loops from pole to pole

Will shift 180 degrees when a direct current is applied

Were discovered by Wilhelm Hurst

None of the above

 

12

 

Materials can be demagnetized by:

Heating above thier curie temperature

Subjecting the component to a reversing and decreasing magnetic field

Both A and B

None of the above

 

13

 

A material with a wider hysteresis loop has:

Lower reluctance

Lower residual magnetism

Higher residual magnetism

Higher premeability

 

14

 

Which of the following has a very weak and negative susceptibility to magnetic field?

Ferromagnetic materials

Diamagnetic materials

Paramagnetic materials

None of the above

 

15

 

The magnetic field circling each loop of wire in a coil combines with the fields from the other loops to produce a concentrated field:

Which is maximized around the outside of the coil

Around each loop of the coil

Down the center of the coil

All of the above

 

16

 

The best detection of defects occurs:

When the magnetic field is 10% beyond its saturation point

When the hysteresis loop shifts from positive to negative

When the lines of magnetic force are parallel to the longest dimension of the defect

When the lines of magnetic force are perpendicular to the longest dimension of the defect

 

17

 

A material with a wider hysteresis loop has:

Lower permeability

Higher retentivity

Higher coercivity

All of the above

 

 A yoke establishes a magnetic field:

18 That can be constant or pulsed

Between the north and south poles of the yoke

Equally in all directions around the poles

Both A and B

 

19

 

A current carrying conductor induces a magnetic field:

By direct inductionBy direct induction

That is longitudinal

That is circular

By magnostriction

 

20

 

The use of prods is sometimes restricted because:

They produce a relatively weak field

There is a potential for arcing that could damage parts

It is not possible to control the field orientation

None of the above

 

21

 

Magnetic particle inspection has several advantages over liquid penetrant inspection which include:

Components with thin coatings can be inspected without removing the coating

Components can be inspected more rapidly

The technique is more portable

Both A and B

 

22  A material with a narrower hysteresis loop has:

Higher permeability

Lower retentivity

Lower coercivity

All of the above

 

23

 

When using both a circular and longitudinal magnetic field, the circular field is usually established first because:

It is more difficult to establish a circular field

It is easier to flip the domains of a circular field to a longitudinal field

It is easier to measure a longitudinal field

None of the above

 

24

 

The opposition that a ferromagnetic material shows to the establishment of a magnetic field is called:

Retentivity

Reluctance

Coercive force

Permeability

 

25

 

When testing parts with magnetic particles, it is best to magnetize the part:

In two directions at right angles to each other

With AC whenever possible

With DC whenever possible

With an amperage of at least 1000 amps

 

26

 

When all the magnetic domains are aligned, the material is said to be:

Magnetically saturated

Partially magnetized

Magnetically stable

Unmagnetized

 

27

 

The area where the exit poles are concentrated is called the magnet’s:

South pole

North pole

Dipole

Flux density

 

28

 

A volume of space where there is a change in magnetic energy is called:

A magnetic field

A magnetic dipole 

A magnetic pole

A magnetic domain

 

29

 

A circular magnetic field has lines of force that run:

Parallel to the long axis of the part

90 degrees to the long axis of the part

Circumferentially around the perimeter of the part

Opposite the waveform of the magnetic particle machine used

 

30

 

A material with a narrower hysteresis loop has:

Higher reluctance

Lower coercivity

Higher retentivity

All of the above

 

31  A material with a narrower hysteresis loop has:

Higher residual magnetism

Higher permeability

Lower residual magnetism

Higher retentivity

 

32

 

A longitudinal magnetic field has magnetic lines of force that run:

Parallel to the long axis of the part

90 degrees to the long axis of the part

Transverse to the long axis of the part

Opposite the waveform of the magnetic particle machine used

 

33

 

Which of the following has a large susceptibility to magnetic field?

Ferromagnetic materials

Diamagnetic materials

Paramagnetic materials

None of the above

 

34

 

Magnetic lines of force:

Have the same strength

Seek the path of least resistance

Decrease in density with increasing distance from the poles

All of the above

 

35  Since all matter is composed of atoms:

All parts can be tested with MPI if they are heated to their curie temperature

All materials can be tested with a MPI regardless of temperature

All materials are affected in some way by a magnetic field

None of the above