A Trivia Quiz On Magnetic Particle Testing!

62 Questions | Total Attempts: 2757

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A Trivia Quiz On Magnetic Particle Testing! - Quiz

Magnets have been used for a long time as a way to check steel components on production lines using a specific measure. Below is a trivia quiz on magnetic particle testing designed to help you see how well you understand the method as a whole. How about you check it out and get to refresh your understanding. All the best!


Questions and Answers
  • 1. 
    Magnetic lines of force are:
    • A. 

      Isolated mono-poles

    • B. 

      Elongated bi-poles

    • C. 

      Manifestations of the "string-theory"

    • D. 

      Imaginary concepts for mapping magnetic fields

  • 2. 
    In a ferromagnetic material, a region where all the atomic moments are aligned parallel to each other is called a:
    • A. 

      Magnetic zone

    • B. 

      Confederation

    • C. 

      Domain

    • D. 

      Magnetic junta

  • 3. 
    In order to be detectable by magnetic particle testing, a flaw must:
    • A. 

      Be surface breaking

    • B. 

      Be no deeper than 1mm below the surface

    • C. 

      Produce a leakage field at the test surface

    • D. 

      All of the above

  • 4. 
    A void in an otherwise homogenous magnetized material presents itself as a point magnetic dipole. This is the basis for:
    • A. 

      Magnetic particle flaw detection

    • B. 

      Multi frequency eddy current

    • C. 

      Para-magnetism

    • D. 

      De-magnetization

  • 5. 
    The point at which the magnetism in a material cannot be increased even though the magnetizing force continues to increase is known as the:
    • A. 

      Salient pole.

    • B. 

      Saturation point.

    • C. 

      Residual point.

    • D. 

      Remnant point.

  • 6. 
    The opposition to the formation of a magnetic flux in a magnetic circuit is referred to as:
    • A. 

      Reactance

    • B. 

      Reluctance

    • C. 

      Resistance

    • D. 

      Antimagnetics

  • 7. 
    Hysteresis loops and the magnetic properties of materials may be affected by:
    • A. 

      Grain size

    • B. 

      Microstructure

    • C. 

      Chemical composition

    • D. 

      All of the above

  • 8. 
    The value of H applied to bring the residual value of B to zero is called:
    • A. 

      Saturation field

    • B. 

      Demagnetization value

    • C. 

      Coercive force

    • D. 

      Phase reversal factor

  • 9. 
    Of the following discontinuity categories, which one is considered most detrimental to the service life of an item?
    • A. 

      Subsurface inclusions

    • B. 

      Subsurface porosity and voids

    • C. 

      Cracks open to the surface

    • D. 

      All of the above

  • 10. 
    The flux density of the magnetism induced by a coil can be controlled by varying:
    • A. 

      The coil size

    • B. 

      The current in the coil

    • C. 

      The number of turns in the coil

    • D. 

      All of the above

  • 11. 
    An electric current which flows steadily in one direction is:
    • A. 

      Direct current

    • B. 

      Full wave current

    • C. 

      Half wave current

    • D. 

      Alternating current

  • 12. 
    A magnetic particle build-up from a discontinuity is strongest when the discontinuity is oriented:
    • A. 

      180° to the magnetic field.

    • B. 

      45° to the magnetic field.

    • C. 

      90° to the magnetic field.

    • D. 

      90° to the current flow.

  • 13. 
    The most important characteristic(s) that a dry powder should have is/are:
    • A. 

      Low coercive force

    • B. 

      Low magnetic retentivity

    • C. 

      High magnetic permeability

    • D. 

      All of the above

  • 14. 
    The negative magnetizing force required to reduce the residual flux density in a part to zero after saturation is called:
    • A. 

      Residual force

    • B. 

      Coercive force

    • C. 

      Demagnetizing field strength

    • D. 

      Null force 

  • 15. 
    In the inspection of a part, the following may justify rejection of some parts:
    • A. 

      Inherent defects

    • B. 

      Service defects

    • C. 

      Processing defects

    • D. 

      All of the above

  • 16. 
    The strength of a circular magnetic field is not determined by the  ________ of a part:
    • A. 

      Permeability

    • B. 

      Diameter

    • C. 

      Length

    • D. 

      Any of the above

  • 17. 
    The width of a magnetic particle indication:
    • A. 

      Indicates flaw depth

    • B. 

      Is always wider than the actual flaw opening

    • C. 

      Is equal to the height of particle indication

    • D. 

      Is determined by the angle of repose

  • 18. 
    When the central conductor MPI method is used to inspect a ring shaped object, or short cylinder:
    • A. 

      Only inside diameter surface flaws can be found

    • B. 

      Only outside diameter surface flaws can be found

    • C. 

      Both inside and outside surface and subsurface flaws can be found if the wall thickness is not too great

    • D. 

      None of the above, central conductors cannot be used for ring shaped objects

  • 19. 
    Given a steel bar 1 foot long and 3 inches diameter, what current should you use for the coil shot with a 3 turn coil (part placed at bottom of coil)?
    • A. 

      100 amps

    • B. 

      2000 amps

    • C. 

      4000 amps

    • D. 

      6000 amps

  • 20. 
    When welds are required to have only partial penetration, use of HWDC yokes often give rise to nonrelevant indications. This problem can be eliminated by:
    • A. 

      Using an A.C. yoke

    • B. 

      Increasing leg spacing

    • C. 

      Reducing magnetizing current

    • D. 

      Using a pie gage

  • 21. 
    The best way to demagnetize a long tube would be:
    • A. 

      Reversing D.C. with a central conductor

    • B. 

      Pulsating A.C. with a central conductor

    • C. 

      A portable yoke

    • D. 

      Passing the tube through an A.C. coil

  • 22. 
    To reduce the discomfort of eye fatigue when performing fluorescent MPI you can:
    • A. 

      Take breaks at regular intervals

    • B. 

      Wear yellow-green tinted glasses (of the appropriate filtering ability)

    • C. 

      Both a and b

    • D. 

      Increase dark adaption time

  • 23. 
    Nonrelevant indications due to residual local poles interfere with magnetic particle testing. For a successful examination one should?
    • A. 

      Magnetize in another direction

    • B. 

      Demagnetize then remagnetize in the desired direction

    • C. 

      Use lower amperage

    • D. 

      Use more amperage

  • 24. 
    If a discontinuity is shallow and broad like a scratch, the flux lines may stream-line below the discontinuity. This will result in:
    • A. 

      A false indication

    • B. 

      A non-relevant indication

    • C. 

      A sub surface indication

    • D. 

      A lack of indication

  • 25. 
    Based on the domain theory, an unmagnetized part has domains that are:
    • A. 

      Randomly oriented

    • B. 

      Aligned north to south

    • C. 

      Aligned east to west

    • D. 

      Aligned 90 degrees to the current flow

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