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NDT EXAM QUESTIONS WITH 100% VERIFIED ANSWERS
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NDT EXAM QUESTIONS WITH 100% VERIFIED ANSWERS...
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NDT EXAM QUESTIONS WITH 100%VERIFIED ANSWERS
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 inside objects that
previously would have needed disassembly.
Video Scope - ANSWER A tiny light-sensitive CCD chip records the image.
Weld - ANSWER A good ____ is uniform in width, with even ripples that taper
off smoothly into the base metal.
Liquid Penetrant Inspection - ANSWER A non-destructive inspection method
used for locating cracks, porosity, or other types of faults open to the surface.
Green - ANSWER Using liquid penetrant inspection an ultraviolet light is used
with the fluorescent penetrant and any flaw shows up as this color.
Red - ANSWER Using liquid penetrant inspection, the colored dye method the
faults show up as this color.
Capillary Attraction - ANSWER An action causing a liquid to be drawn up into
extremely tiny tubes or between close-fitting parts.
Defect must be open to the surface - ANSWER The primary limitation of dye
penetrant inspection in that...
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 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.
Direct Current - ANSWER Excellent penetrating qualities (110-440 volts) and
is suitable for magnetizing parts in coils and with yokes. Is difficult to change
its value as required for inspecting different-sized objects.
Half-Wave Rectified DC - ANSWER Has identical penetrating qualities as
straight DC and it's pulsating nature helps distribute the magnetic particles so
they arrange themselves over any fault.
Alternating Current - ANSWER The field strength is almost totally
concentrated on the surface of the material. Useful for locating surface faults
only.
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