Quiz Flashcards
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 Cannot be reused
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
c Coercive force
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 magnetic field
Magnetic particle inspection uses small ferromagnetic particles simmilar to:
a Copper filing
b Iron filings
c Magnesium filings
d Permanent Magnets
b Iron filings
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
c Randomly organized
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 Ferromagnetic materials
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
D Its residual magnetic field measures less than 3 gauss
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 magnetic pole
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 Dipole
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
C Both A and B
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
B Reluctance
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 In two directions at right angles to each other
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
B Residual magnetism
The area where the exit poles are concentrated is called the magnet’s:
A South pole
B North pole
C Dipole
D Flux density
B North pole
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. 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
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
D When the lines of magnetic force are perpendicular to the longest dimension of the defect
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
B Iron, nickel, cobalt
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
C Coercive force
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 Affect machining and welding processes
B Interfere with near by electronic components
C Increase wear by attracting abrasive particles
D All of the above
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
B Magnetic flux density
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
B Along the inside edge of the coil
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
B
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.
B
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
D Reduces inspection time
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
C Magnetic poles form at the edges of the crack
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
C
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
B Diamagnetic materials
When all the magnetic domains are aligned, the material is said to be:
A Magnetically saturated
B Partially magnetized
C Magnetically stable
D Unmagnetized
C Magnetically stable
Ferromagnetic materials are made up of small polarized regions known as:
A Photons
B Quarks
C Electrons
D Domains
D Domains
A material with a narrower hysteresis loop has:
A Higher reluctance
B Lower coercivity
C Higher retentivity
D All of the above
B Lower coercivity
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 Form closed loops from pole to pole
A material with a narrower hysteresis loop has:
a Higher residual magnetism
b Higher permeability
c. Higher residual magnetism
d Higher retentivity
b Higher permeability
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
B
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
d Never cross each other
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
b 90 degrees to the long axis of the part
A material with a wider hysteresis loop has:
a Lower permeability
b Higher retentivity
c Higher coercivity
d All of the above
a Lower permeability
b Higher retentivity
c Higher coercivity
d All of the above
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 Parallel to the long axis of the part
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 material with a wider hysteresis loop has:
A Higher reluctance
B Higher permeability
C Lower retentivity
d All of the above
A Higher reluctance
A material with a narrower hysteresis loop has:
a Higher permeability
b Lower retentivity
c Lower coercivity
d All of the above
d All of the above
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
b Around each loop of the coil
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
d A Permeability
A material with a wider hysteresis loop has:
A Lower reluctance
B Lower residual magnetism
C Higher residual magnetism
D Higher permeability
C Higher residual magnetism
A current carrying conductor induces a magnetic field:
A By direct induction
B That is longitudinal
C That is circular
D By magnostriction
C That is circular
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 Direct current
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
B There is a potential for arcing that could damage part
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
C Retain a residual magnetic field withing the component
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
C
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
C
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
D