NDT Exam Study Guide latest Update
Boroscope - Answer-An optical device similar in principle to a telescope in that it enlarges objects
like a magnifying glass.
Fiberoptic Scope - Answer-An optical device that has a flexible, articulated probe that can bend
around corners. Allows you to see ins...
Dwell Time - Answer✔✔-The amount of time required for a penetrant to cure is called it's ____ ____ and
is determined by the size and shape of the discontinuities being looked for.
Water, Emulsifying Agent, or a solvent - Answer✔✔-Liquid penetrant is removed using either...sprayed at
a 45 degree angle.
Dry Developer - Answer✔✔-This developer contains loose powder material such as talcum, typically
placed in a bin of loose developer.
Wet Developer - Answer✔✔-This developer typically consists of a white powder mixed with water that is
either flowed over a surface, or a part is immersed in it.
Non Aqueous Developer - Answer✔✔-This developer consists of a white chaulk-like powder suspended
in a solvent that is normally applied from a pressure spray can, or sprayed onto a surface with a paint
gun.
Magnetic particle inspection - Answer✔✔-This method of NDT is useful for detecting cracks, splits,
seams and voids that form when a metal ruptures. Also useful for detecting cold shuts and inclusions of
foreign matter. (Ferrous metals)
Perpendicular to the Fault - Answer✔✔-In order to detect a crack with magnetic particle inspection, the
part must be magnetized in such a way that the lines of flux are...
Longitudinal Magnetism - Answer✔✔-In this time of magnetism, the magnetizing current flows either
through a coil in which the part is placed, or through a coil around a soft iron yoke.
Circular Magnetization - Answer✔✔-In this type of magnetism, the magnetizing current flows through a
part being inspected, the lines of magnetic flux created encircle the part.
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