Quiz

Question 1

Dry magnetic particles:

a Cannot be reused
b Come in only one color
c Are all of uniform size
d None of the above

Answer 1

a Cannot be reused

Question 2

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

a Inverse force
b Reciprocal force
c Coercive force
d Residual force

Answer 2

c Coercive force

Question 3

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

a A magnetic field
b A magnetic dipole
c A magnetic pole
d A magnetic domain

Answer 3

A A magnetic field

Question 4

Magnetic particle inspection uses small ferromagnetic particles simmilar to:

a Copper filing
b Iron filings
c Magnesium filings
d Permanent Magnets

Answer 4

b Iron filings

Question 5

When a ferromagnetic material is in a unmagnetized state, the domains are:

a Aligned in a north and south direction
b Aligned in a east and west direction
c Randomly organized
d Balanced to produce a gauss rating of 2

Answer 5

c Randomly organized

Question 6

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

a Ferromagnetic materials
b Diamagnetic materials
c Paramagnetic materials
d None of the above

Answer 6

a Ferromagnetic materials

Question 7

A material is considered demagnetized when:

A Its residual magnetic field measures less than 5 gauss
B It no longer produces an indication
c It’s no longer attracted to a magnet
D Its residual magnetic field measures less than 3 gauss

Answer 7

D Its residual magnetic field measures less than 3 gauss

Question 8

A location where a magnetic field can be detected exiting or entering a material is called:

a A magnetic pole
b A magnetic field
C A flux field
D Polarity

Answer 8

a A magnetic pole

Question 9

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

a Dipole
b Inductor
c Capacitor
d A ferromagnetic material

Answer 9

a Dipole

Question 10

Materials can be demagnetized by:

A Heating above thier curie temperature
B Subjecting the component to a reversing and decreasing magnetic field
C Both A and B
d non of the obove

Answer 10

C Both A and B

Question 11

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

A Retentivity
B Reluctance
C Coercive force
D Permeability

Answer 11

B Reluctance

Question 12

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

A In two directions at right angles to each other
B With AC whenever possible
C With DC whenever possible
D With an amperage of at least 1000 amps

Answer 12

A In two directions at right angles to each other

Question 13

The magnetic flux density that remains in the material when the magnetizing force is zero is called:
A Retentivity
B Residual magnetism
C Coercive force
D Permeability

Answer 13

B Residual magnetism

Question 14

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

A South pole
B North pole
C Dipole
D Flux density

Answer 14

B North pole

Question 15

Magnetic lines of force:

A. Have the same strength
B Seek the path of least resistance
C Decrease in density with increasing distance from the poles
D All of the above

Answer 15

A. Have the same strength
B Seek the path of least resistance
C Decrease in density with increasing distance from the poles
D All of the above

Question 16

The best detection of defects occurs:

A When the magnetic field is 10% beyond its saturation point
B When the hysteresis loop shifts from positive to negative
C When the lines of magnetic force are parallel to the longest dimension of the defect
D When the lines of magnetic force are perpendicular to the longest dimension of the defect

Answer 16

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

Question 17

Magnetic particle inspection can be performed on parts made from which materials?
C Iron, nickel, copper
B Iron, nickel, cobalt
C nickel , cobalt, copper
D Iron only

Answer 17

B Iron, nickel, cobalt

Question 18

The amount of reverse magnetic field which must be applied to a magnetic material to reduce the magnetic flux to zero is called:

a Retentivity
B Residual magnetism
C Coercive force
D Permeability

Answer 18

C Coercive force

Question 19

Components generally must be demagnetized because residual magnetism can:

A Affect machining and welding processes
B Interfere with near by electronic components
C Increase wear by attracting abrasive particles
D All of the above

Answer 19

A Affect machining and welding processes
B Interfere with near by electronic components
C Increase wear by attracting abrasive particles
D All of the above

Question 20

The number of magnetic lines of force cutting thorugh a plane of a given area at a right angle is known as the:

A Magnetic flux leakage
B Magnetic flux density
C Magnetic ampere
D None of the above

Answer 20

B Magnetic flux density

Question 21

When performing a magnetic particle test with a coil, the part should be placed:

A Along the outside edge the coil
B Along the inside edge of the coil
Centered in the coil
D None of the above

Answer 21

B Along the inside edge of the coil

Question 22

A yoke establishes a magnetic field:

A That can be constant or pulsed
B Between the north and south poles of the yoke
C Equally in all directions around the poles
DBoth A and B

Answer 22

B

Question 23

Faraday’s Law of Magnetic Induction states that:

A The flow of electrons can be used to generate a magnetic field
B The magnetic forces of the material’s electrons will be affected by an external magnetic field
C Iron filings can be used to produce an indication of a flaw
D Flux leakage is the byproduct of magnetic fields when testing aluminum alloys.

Answer 23

B

Question 24

Multidirectional inspection equipment:.

AProvides a more sensitive inspection.
B Provices a less sensitive inspection
Can be used without the need for QQIs
D Reduces inspection time

Answer 24

D Reduces inspection time

Question 25

When a magnetic field cuts across a crack: A Electrons begin jumping back and forth across the crack B The crack begins to heat up C Magnetic poles form at the edges of the crack D All of the above

Answer 25

C Magnetic poles form at the edges of the crack

Question 26

Since all matter is composed of atoms: A All parts can be tested with MPI if they are heated to their curie temperature B All materials can be tested with a MPI regardless of temperature C All materials are affected in some way by a magnetic field D None of the above

Answer 26

C

Question 27

Which al the following has a very weak and negative, susceptibility to magnetic fields A Ferromagnetic materials B Diamagnetic materials C Paramagnetic materials D None of the above

Answer 27

B Diamagnetic materials

Question 28

When all the magnetic domains are aligned, the material is said to be: A Magnetically saturated B Partially magnetized C Magnetically stable D Unmagnetized

Answer 28

C Magnetically stable

Question 29

Ferromagnetic materials are made up of small polarized regions known as: A Photons B Quarks C Electrons D Domains

Answer 29

D Domains

Question 30

A material with a narrower hysteresis loop has: A Higher reluctance B Lower coercivity C Higher retentivity D All of the above

Answer 30

B Lower coercivity

Question 31

Magnetic lines of force: A Form closed loops from pole to pole B Will shift 180 degrees when a direct current is applied C Were discovered by Wilhelm Hurst D None of the above

Answer 31

A Form closed loops from pole to pole

Question 32

A material with a narrower hysteresis loop has: a Higher residual magnetism b Higher permeability c. Higher residual magnetism d Higher retentivity

Answer 32

b Higher permeability

Question 33

When using the direct induction method: a The part must be placed in the center of the coil b Good electrical contact must be established between the test fire equipment and test component c the part may be tested in only one direction d It is not necessary to demagnetize the part

Answer 33

B

Question 34

Magnetic lines of force: a Almost never cross each other b Commonly cross each other c Will shift 90 degrees when a direct current is applied d Never cross each other

Answer 34

d Never cross each other

Question 35

A circular magnetic field has lines of force that run: a Parallel to the long axis of the part b 90 degrees to the long axis of the part c Circumferentially around the perimeter of the part d Opposite the waveform of the magnetic particle machine used

Answer 35

b 90 degrees to the long axis of the part

Question 36

A material with a wider hysteresis loop has: a Lower permeability b Higher retentivity c Higher coercivity d All of the above

Answer 36

a Lower permeability b Higher retentivity c Higher coercivity d All of the above

Question 37

A longitudinal magnetic field has magnetic lines of force that run: a Parallel to the long axis of the part b 90 degrees to the long axis of the part c Transverse to the long axis of the part

Answer 37

a Parallel to the long axis of the part

Question 38

A hysteresis loop shows the relationship between the: a Induced magnetic flux density and the magnetizing force b Induced magnetic flux density and the electron force c Electron flow and magnetic field strength d Flux density and number of coil turns

Answer 38

A

Question 39

A material with a wider hysteresis loop has: A Higher reluctance B Higher permeability C Lower retentivity d All of the above

Answer 39

A Higher reluctance

Question 39

A material with a narrower hysteresis loop has: a Higher permeability b Lower retentivity c Lower coercivity d All of the above

Answer 39

d All of the above

Question 40

The magnetic field circling each loop of wire in a coil combines with the fields from the other loops to produce a concentrated field: a Which is maximized around the outside of the coil b Around each loop of the coil c Down the center of the coil d All of the above

Answer 40

b Around each loop of the coil

Question 41

A property of a material that describes the ease with which a magnetic flux is established in a component is called: a Retentivity b Residual magnetism c Coercive force d A Permeability

Answer 41

d A Permeability

Question 42

A material with a wider hysteresis loop has: A Lower reluctance B Lower residual magnetism C Higher residual magnetism D Higher permeability

Answer 42

C Higher residual magnetism

Question 43

A current carrying conductor induces a magnetic field: A By direct induction B That is longitudinal C That is circular D By magnostriction

Answer 43

C That is circular

Question 44

Which type of current flows continuously in one direction at a constant voltage A Direct current B Alternating current C Rectified alternating current D Half wave rectified alternating current

Answer 44

A Direct current

Question 45

The use of prods is sometimes restricted because: A They produce a relatively weak field B There is a potential for arcing that could damage parts C It is not possible to control the field orientation D None of the above

Answer 45

B There is a potential for arcing that could damage part

Question 46

When the magnetizing current is stopped, a ferromagnetic material will: A remain magnetically saturated B become demagnetized C Retain a residual magnetic field withing the component D None of the above

Answer 46

C Retain a residual magnetic field withing the component

Question 47

The central conductor technique is sometimes used because it: A Allows large diameter circular parts to be completely inspected with one application of the magnetizing force B Produces a longitudinal field in circular parts C Establishes a magnetic field that extends from the ID to the OD of a circular part D None of the above

Answer 47

C

Question 48

When using both a circular and longitudinal magnetic field, the circular field is usually established first because:" A It is more difficult to establish a circular B It is easier to flip the domains of a circular field to a longitudinal field C It is easier to measure a longitudinal field D None of the above

Answer 48

C

Question 49

Magnetic particle inspection has several advantages over liquid penetrant inspection which include: A Components with thin coatings can be inspected without removing the coating B Components can be inspected more rapidly C The technique is more portable D Both A and B

Answer 49

D