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MT L1 > Quiz > Flashcards

Quiz Flashcards

1
Q

Dry magnetic particles:

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

A

a Cannot be reused

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2
Q

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

A

c Coercive force

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3
Q

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

A

A A magnetic field

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4
Q

Magnetic particle inspection uses small ferromagnetic particles simmilar to:

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

A

b Iron filings

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5
Q

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

A

c Randomly organized

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6
Q

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

A

a Ferromagnetic materials

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7
Q

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

A

D Its residual magnetic field measures less than 3 gauss

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8
Q

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

A

a A magnetic pole

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9
Q

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

A

a Dipole

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10
Q

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

A

C Both A and B

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11
Q

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

A

B Reluctance

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12
Q

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

A

A In two directions at right angles to each other

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13
Q

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

A

B Residual magnetism

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14
Q

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

A South pole
B North pole
C Dipole
D Flux density

A

B North pole

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15
Q

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

A

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

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16
Q

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

A

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

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17
Q

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

A

B Iron, nickel, cobalt

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18
Q

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

A

C Coercive force

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19
Q

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

A

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

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20
Q

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

A

B Magnetic flux density

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21
Q

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

A

B Along the inside edge of the coil

22
Q

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

A

B

23
Q

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.

A

B

24
Q

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

A

D Reduces inspection time

25
Q

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

A

C Magnetic poles form at the edges of the crack

26
Q

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

A

C

27
Q

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

A

B Diamagnetic materials

28
Q

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

A Magnetically saturated
B Partially magnetized
C Magnetically stable
D Unmagnetized

A

C Magnetically stable

29
Q

Ferromagnetic materials are made up of small polarized regions known as:

A Photons
B Quarks
C Electrons
D Domains

A

D Domains

30
Q

A material with a narrower hysteresis loop has:

A Higher reluctance
B Lower coercivity
C Higher retentivity
D All of the above

A

B Lower coercivity

31
Q

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

A

A Form closed loops from pole to pole

32
Q

A material with a narrower hysteresis loop has:

a Higher residual magnetism
b Higher permeability
c. Higher residual magnetism
d Higher retentivity

A

b Higher permeability

33
Q

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

A

B

34
Q

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

A

d Never cross each other

35
Q

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

A

b 90 degrees to the long axis of the part

36
Q

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

A

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

37
Q

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

A

a Parallel to the long axis of the part

38
Q

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

A

A

39
Q

A material with a wider hysteresis loop has:

A Higher reluctance
B Higher permeability
C Lower retentivity
d All of the above

A

A Higher reluctance

39
Q

A material with a narrower hysteresis loop has:

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

A

d All of the above

40
Q

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

A

b Around each loop of the coil

41
Q

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

A

d A Permeability

42
Q

A material with a wider hysteresis loop has:

A Lower reluctance
B Lower residual magnetism
C Higher residual magnetism
D Higher permeability

A

C Higher residual magnetism

43
Q

A current carrying conductor induces a magnetic field:

A By direct induction
B That is longitudinal
C That is circular
D By magnostriction

A

C That is circular

44
Q

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

A

A Direct current

45
Q

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

A

B There is a potential for arcing that could damage part

46
Q

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

A

C Retain a residual magnetic field withing the component

47
Q

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

A

C

48
Q

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

A

C

49
Q

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

A

D

MT L1 (5 decks)

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