nat sci

31問 • 1年前

問題一覧

Which statement regarding aircraft bolts is correct?

In general, bolt grip lengths should equal the material thickness

How many of these factors are considered essential knowledge for x-ray exposure? 1. Processing of the film 2. Material thickness and density 3. Exposure distance and angle 4. Film characteristicsHow many of these factors are considered essential knowledge for x-ray exposure?

three

What precision measuring tool is used for measuring crankpin and main bearing journals for out-of-round wear?

micrometer caliper

On a fillet weld, the penetration requirement includes what percentage(s) of the base metal thickness?

25-50 percent

What is descriptive of the annealing process of steel during after it has been annealed?

Slow cooling; low strength

Which tool can be used to determine piston pin out-of-round wear?

micrometer caliper

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

The size and shape of the discontinuities being looked for

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

In examining and evaluating a welded joint, a mechanic should be familiar with

Likely ambient exposure conditions and intended use of the part, along with type of weld and original part material composition

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 structure or configuration of a part (2) A discontinuity may or may not affect the usefulness of a part Regarding the above statements,

Both No.1 and No.2 are true

In performing a dye penetrant inspection, the developer

Acts as a blotter to produce a visible indication

If it is necessary to accurately measure the diameter of a hole approximately 1⁄4 inch in diameter, the mechanic should use a

Small-hole gauge and determine the size of the hole by taking a micrometer reading of the ball end of the gauge

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

continuous

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

wet and dry process materials

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

Was not thoroughly washed before the developer was applied

What aluminum alloy designations indicate that the metal has received no hardening or tempering treatment

3003-F

Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?

case hardening

Unless otherwise specified, torque values for tightening aircraft nuts and bolts relate to

clean, dry threads

What nondestructive testing method requires little 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-treat conditions?

eddy current inspection

How is the locking feature of the fiber-type locknut obtained?

By the use of an unthreaded fiber locking insert

When the specific torque value for nuts is not given, where can the recommended torque value be found?

AC 43. 13-1B

Alclad is a metal consisting of

Pure aluminum surface layers on an aluminum alloy core

Which of the following defects are not acceptable for metal lines? 1. Cracked flare 2. Seams 3. Dents in the heel of a bend less than 20% of the diameter 4. Scratches/nicks on the inside of a bend less than 10% of wall thickness 5. Dents in straight section that are 20% of tube diameter

1,2,3 and 5

Which heat-treating process of metal produces a hard, wear-resistant surface over a strong, tough core?

case hardening

Generally speaking, bolt grip lengths should be

Equal to the thickness of the material which is fastened together

Which of the following describe the effects of annealing steel and aluminum alloys?

1,2

A bolt with an X inside a triangle on the head is classified as

NAS close tolerance bolt

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

Reveal all possible defects

Unless otherwise specified or required, aircraft bolts should be installed so that the bolthead is

Upward, or in a forward direction

(1) An aircraft part may be demagnetized by subjecting it to a magnetizing force from alternating current that is gradually reduced in strength (2) An aircraft part may be demagnetized by subjecting it to a magnetizing force from direct current that is alternately reversed in direction and gradually reduced in strength Regarding the above statements,

Both No. 1 and No. 2 are true

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