A Trivia Quiz On Magnetic Particle Testing!

62 Questions | By Cheriewesson | Last updated: Mar 21, 2022 | 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