AG251 Non Destructive Testing

Magnetic particle inspection is used primarily to detect

flaws on or near the surface .

Liquid penetrant inspection methods may be used on which of the following ?

Ferrous and nonferrous metals and nonporous plastics

Which of these nondestructive testing methods is suitable for the inspection of most metals, plastics, and ceramics for surface and subsurface defects?

Ultrasonic inspection

What nondestructive testing method requires litle or no part preparation, is used to detect surface or near-surface defects in most metals, and may also be used to separate metals or alloys and their heat-treated condition?

Eddy current inspection

What method of magnetic particle inspection is used most often to inspect aircraft parts for invisible cracks and other defects ?

Continuous

Which of the following factors are considered essential knowledge for X - ray exposure ?

Material thickness and density and the type of defect to be detected

The testing medium that is generally used in magnetic particle inspection utilizes a ferromagnetic material that has

high permeability and low retentivity .

Which statement relating to the residual magnetizing inspection method is true ?

It may be used with steels which have been heat treated for stressed applications

What non destructive testing method is used to determine the soundness of the repair has cured?

Metallic ring test

What two types of indicating mediums are available for magnetic particle inspection ?

Wet and dry process materials

Which of the following materials may be inspected using the magnetic particle inspection method ?

Iron alloys

One way a part may be demagnetized after magnetic particle inspection is by

slowly moving the part out of an ac magnetic field of sufficient strength

Which type rack can be detected by magnetic particle inspection using either circular or longitudinal magnetization ?

45 degrees

Which of the following methods may be suitable to use to detect cracks open to the surface in aluminum forgings and castings ?

Dye penetrant inspection and eddy current inspection

To detect a minute crack using dye penetrant inspection usually requires

A longer - than - normal penetrating time

Which of the following is a main determinant of the dwell time to use when conducting a dye or fluorescent penetrant inspection ?

The size and shape of the discontinuities being looked for

lWhen checking an item with the magnetic particle inspection method , circular and longitudinal magnetization should be used to

reveal all possible defects

In magnetic particle inspection , a flaw that is perpendicular to the magnetic field flux lines generally causes

a large disruption in the magnetic field

If dye penetrant inspection indications are not sharp and clear , the most probable cause is that the part

was not thoroughly washed before the developer was applied

1 ) An aircraft part may be demagnetized by subjecting it to a magnetizing force from alternating current that is gradually reduced in strength . direct current that is alternately reversed in direction and gradually reduced in

( 2 ) An aircraft part may be demagnetized by subjecting it to a magnetizing force from strength.

Regarding the above statements

Both 1 and 2 are true

The pattern for an inclusion is a magnetic particle buildup forming

Parallel lines

A part which is being prepared for dye penetrant inspection should be cleaned with

A volatile petroleum-base solvent

In performing a dye penetrant inspection, the developer

Acts as a blotter to produce a visual indication

Circular magnetization of a part can be used to detect which defects ?

Defects parallel to the long axis of the part .

( 1 ) In nondestructive testing , a discontinuity may be defined as an interruption in the normal physical the structure or configuration of a part . ( 2 ) A discontinuity may or may not affect usefulness of a part.

Regarding the above statements ,

Both 1 and 2 are true

What defects will be detected by magnetizing a part using continuous longitudinal magnetization with a cable?

Defects perpendicular to the long axis of the part

Under magnetic particle inspection , a part will be identified as having a fatigue crack under which condition ?

The discontinuity is found in a highly stressed area of the part

Which of the following defects are not acceptable for metal lines

Dents in straight section that are 20% of tube diameter .