nat sci 2

35問 • 1年前

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The society of Automotive Engineers (SAE) and the American Iron and Steel Institute use a numerical index system to identify the composition of various steels. In the number ‘4130’ designating chromium molybdenum steel, the first digit indicates the

basic alloying element

Which of the following occurs when a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending? 1. The metals become artificially aged. 2. The metals become stress corrosion cracked 3. The metals become cold worked, strain or work hardened

Which of the following materials may be inspected using the magnetic particle inspection method? 1. Magnesium alloys 2. Aluminum alloys 3. Iron alloys 4. Copper alloys 5. Zinc alloys

What is steel tempered after being hardened

To relieve its internal stresses and reduce its brittleness

Which condition indicates a part has cooled too quickly after being welded?

Cracking adjacent to the weld

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

By the use of an unthreaded fiber locking insert

Which material cannot be heat treated repeatedly without harmful effects?

clad aluminum alloy

Which number represents the Vernier scale graduation of a micrometer?

.0001

Identify the correct statement

Dividers do not provide a reading when used as measuring device

One characteristics of a good weld is that no oxide should be formed on the base metal at a distance from the weld of more than

1/2 inch

Which statement regarding aircraft bolts is correct?

In general, bolt grip lengths should equal the material thickness

What is generally used in the construction of aircraft engine firewalls?

stainless steel

Why is it considered good practice to normalize a part after welding?

To relieve internal stresses developed within the base metal

Aircraft bolts are usually manufactured with a

Class 3 fit for the threads

A fiber-type, self-locking nut must never be used on an aircraft if the bolt is

Subject to rotation

The aluminum code number 1100 identifies what type of aluminum

99 percent commercially pure aluminum

Magnetic particle inspection is used primarily to detec

Flaws on or near the surface

The clearance between the piston rings and the ring lands is measured with a

thickness gauge

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

Where is an AN clevis bolt used in an airplane

Only for shear load applications

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

A large disruption in the magnetic field

What type of corrosion may attack the grain boundaries of aluminum alloys when the heat treatment process has been improperly accomplished?

intergranular

Select a characteristics of a good gas weld

The weld should taper off smoothly into the base metal

The twist of a connecting rod is checked by installing push-fit arbors in both ends, supported by parallel steel bars on a surface plate. Measurements are taken between the arbor and the parallel bar with a

thickness gauge

The core material of Alclad 2024-T4 is

Heat-treated aluminum alloy, and the surface material is commercially pure aluminum

Which tool is used to measure the clearance between a surface plate and a relatively narrow surface being checked for flatness?

thickness gauge

What tool is generally used to calibrate a micrometer or check its accuracy?

gauge block

How is a clevis bolt used with a fork-end cable terminal secured?

With a shear nut tightened to a snug fit, but with no strain imposed on the fork and safe tied with a cotter pin

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

High permeability and low retentivity

To detect a minute crack using dye penetrant inspection usually requires

A longer-than-normal penetrating time

mechanic has completed a bonded honeycomb repair using the potted compound repair technique. What nondestructive testing method is used to determine the soundness of the repair after the repair has cured?

metallic ring test

What may be used to check the stem on a poppet-type valve for stretch?

micrometer

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

Defects perpendicular to the axis of the part

Which of the following methods may be suitable to use to detect cracks open to the surface in aluminum forgings and castings? 1. Dye penetrant inspection 2. Magnetic particle inspection 3. Metallic ring (coin tap) inspection 4. Eddy current inspection 5. Ultrasonic inspection 6. Visual inspection

1,4,5,6

How can the dimensional inspection of a bearing in a rocker arm be accomplished?

Telescopic gauge and micrometer

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