NDT Exam One MT (Magnetic Particle Testing) Study Guide & Revision Notes
Ferromagnetic material is:
a. strongly attracted by a magnet.
b. not highly saturated by magnetic fields.
c. a material with a 0 permeability measurement.
d. not capable of being magnetized. - ✔✔a. strongly attracted by a magnet.
The permeability of a material describes:
a. the ease with which it can be magnetized.
b. the depth of the magnetic field in the part.
c. the length of time required to demagnetize it.
d. the ability to retain the magnetic field. - ✔✔a. the ease with which it can be magnetized.
The retentivity of a material describes:
a. the ease with which it can be magnetized.
b. the depth of the magnetic field in the part.
c. the length of time required to demagnetize it.
d. the ability to retain the magnetic field. - ✔✔d. the ability to retain the magnetic field.
The unit usually used to denote flux density is:
a. gauss.
b. henry.
c. farad.
d. ampere. - ✔✔a. gauss.
, Magnetic flux lines that are parallel to a discontinuity produce:
a. strong indications.
b. weak indications.
c. no indications.
d. fuzzy indications. - ✔✔c. no indications.
A part is adaptable to magnetic particle inspection if:
a. it is attached to an electrostatic field.
b. the material is ferromagnetic.
c. the material is non-ferrous.
d. the material is an electric conductor. - ✔✔b. the material is ferromagnetic.
What rule describes the direction of current flow (+ to -) when lines of magnetic force surround
a conductor?
a. left-hand rule
b. right-hand rule
c. flux rule
d. reluctance rule - ✔✔b. right-hand rule
The proper number of ampere-turns for a given test specimen being examined by longitudinal
magnetism is determined by:
a. its length and diameter.
b. the material.
c. the diameter and the material.
d. its diameter. - ✔✔a. its length and diameter.
A circular field may be induced into a specimen by:
Ferromagnetic material is:
a. strongly attracted by a magnet.
b. not highly saturated by magnetic fields.
c. a material with a 0 permeability measurement.
d. not capable of being magnetized. - ✔✔a. strongly attracted by a magnet.
The permeability of a material describes:
a. the ease with which it can be magnetized.
b. the depth of the magnetic field in the part.
c. the length of time required to demagnetize it.
d. the ability to retain the magnetic field. - ✔✔a. the ease with which it can be magnetized.
The retentivity of a material describes:
a. the ease with which it can be magnetized.
b. the depth of the magnetic field in the part.
c. the length of time required to demagnetize it.
d. the ability to retain the magnetic field. - ✔✔d. the ability to retain the magnetic field.
The unit usually used to denote flux density is:
a. gauss.
b. henry.
c. farad.
d. ampere. - ✔✔a. gauss.
, Magnetic flux lines that are parallel to a discontinuity produce:
a. strong indications.
b. weak indications.
c. no indications.
d. fuzzy indications. - ✔✔c. no indications.
A part is adaptable to magnetic particle inspection if:
a. it is attached to an electrostatic field.
b. the material is ferromagnetic.
c. the material is non-ferrous.
d. the material is an electric conductor. - ✔✔b. the material is ferromagnetic.
What rule describes the direction of current flow (+ to -) when lines of magnetic force surround
a conductor?
a. left-hand rule
b. right-hand rule
c. flux rule
d. reluctance rule - ✔✔b. right-hand rule
The proper number of ampere-turns for a given test specimen being examined by longitudinal
magnetism is determined by:
a. its length and diameter.
b. the material.
c. the diameter and the material.
d. its diameter. - ✔✔a. its length and diameter.
A circular field may be induced into a specimen by:
