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General > Materials & Processes > Flashcards

Materials & Processes Flashcards

1
Q

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

A

Basic alloying element

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2
Q

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

A

micrometer caliper

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3
Q

Magnetic particle inspection is used primarily to detect

A

Flaws on or near the surface

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4
Q

Aircraft bolts with a cross asterisk marked on the bolthead are

A

Standard steel bolts

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5
Q

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

A

A volatile petroleum-base solvent

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6
Q

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

A

The size and shape of the discontinuities being looked for

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7
Q

In the four-digit aluminum index system number 2024, the first digit indicates

A

The major alloying element

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8
Q

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

A

High permeability and low retentivity

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9
Q

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

A

Defects perpendicular to the long axis of the part.

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10
Q

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

A

Gauge block

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11
Q

What type crack can be detected by magnetic particle inspection using either circular or longitudinal magentization?

A

45 degrees

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12
Q

Why is steel tempered after being hardned?

A

To relieve its internal stresses and reduce its brittleness

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13
Q

What is generally used in the construction of aircraft exhaust collectors, stacks, and manifolds?

A

Stainless steel

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14
Q

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

A

3

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15
Q

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

A

thickness gauge

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16
Q

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

A

By the use of an unthreaded fiber locking insert.

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17
Q

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

A

A large distribution in the magnetic field.

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18
Q

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

A

Clean dry threads

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19
Q

(Refer to Figure 46.) The measurement reading on the illustrated micrometer is

A

0.2851

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20
Q

(Refer to Figure 43.) Identify the clevis bolt illustrated

A

3

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21
Q

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?

A

Eddy Current Inspection

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22
Q

normalizing is a process of heat-treating

A

Iron-base metals only.

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23
Q

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

A

Slow cooling; low strength

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24
Q

Aircraft bolts are usually manufactured with a

A

Class 3 fit for the threads

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25
Q

(Refer to Figure 49.) The measurement reading on the micrometer is

A

0.2792

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26
Q

In performing a dye penetrant inspection, the developer

A

Acts as a blotter to produce a visible indication.

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27
Q

The reheating of a heat treated metal, such as with a welding torch

A

Can significantly alter a metal’s properties in the reheated area.

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28
Q

The core material of Alclad 2024-T4 is

A

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

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29
Q

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

A

AC 43.13-1B

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30
Q

Self-locking nuts may be used on aircraft provided that

A

The bolt or nut are not subject to rotation.

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31
Q

Which of the following methods may be suitable to use to detect cracks to open ti 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

A

1,4,5,6

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32
Q

Which heat0treating process of metal procedures a hard, wear resistant surface over a strong, tough core?

A

Case hardening

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33
Q

(Refer to Figure 44.) Select the illustration which depicts a cold weld

A

2

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34
Q

Where is an AN clevis bolt used in an airplane?

A

Only for shear load applications

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35
Q

A particular component is attached to the aircraft structure by the use of an aircraft bolt and a castle tension nut combination. If the cotter pin hole does not align within the recommended torque range, the acceptable practice is to

A

Change washers and try again

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36
Q

(Refer to Figure 44.) Identify the weld caused by an excessive amount of acetylene

A

3

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37
Q

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

A

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

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38
Q

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

A

NAS close tolerance bolt

39
Q

Why should an aircraft maintenance technician be familiar with weld nomenclature?

A

In order to gain familiarity with the welding technique, filler material, and temperature range used.

40
Q

Alclad metal consisting of

A

Pure aluminum surface layers on an aluminum alloy core.

41
Q

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 magnetized by subjecting it to a magnetizing force from a direct current that is alternately reversed in direction and gradually reduced in strength.
Regarding the above statements,

A

Both no.1 and no.2 are true

42
Q

Holes and a few projecting globules are found in a weld. What action should be taken?

A

Remove all the old weld, and reweld the joint.

43
Q

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

A

Wet and dry process materials

44
Q

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

A

Case hardening

45
Q

Generally speaking, bolt grip lengths should be

A

Equal to the thickness of the material which is fastened together

46
Q

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

A

Was not thoroughly washed before the developer was applied

47
Q

The side clearances of piston rings are measured with a

A

Thickness gauge

48
Q

The aluminum code number 1100 identifies what type of aluminum?

A

99 percent commercially pure aluminum

49
Q

Identify the correct statement

A

Dividers do not provide a reading when used as a measuring device.

50
Q

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

A

Thickness gauge

51
Q

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

A

Ultrasonic inspection

52
Q

How many of these factors are considered essential knowledge for x-ray exposure?

1) Processing of the firm
2) Material thickness and density
3) Exposure distance and angle
4) Film characteristics

A

Three

53
Q

(Refer to Figure 45.) What type of weld is shown at A?

A

Butt

54
Q

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

A

3003-F

55
Q

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

A

Defects parallel to the long axis of the part.

56
Q

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.

A

3

57
Q

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

A

Cracking adjacent to the weld

58
Q

(Refer to Figure 42.) Which of the following bolthead code markings shown identifies an AN corrosion resistant steel bolt?

A

3

59
Q

Which tool can be used to measure the alignment of a rotor shaft or the plane of rotation of a disk?

A

Dial indicator

60
Q

Select a characteristic of a good gas weld.

A

The weld should taper off smoothly into the base metal

61
Q

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

A

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

62
Q

(Refer to Figure 48.) What does the micrometer read?

A

.3004

63
Q

Which material cannot be heat treated repeatedly without harmful effects?

A

Clad aluminum alloy

64
Q

Which metal has special short-time heat properties and is used in the construction aircraft firewalls?

A

Titanium alloy

65
Q

A bolt with a single raised dash on the head is classified as an

A

AN corrosion-resistant steel bolt

66
Q

Which tool is used to find the center of a shaft or other cylindrical work?

A

Combination set

67
Q

The core material of Alclad 2024-T4 is

A

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

68
Q

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

1) Decrease in internal stress
2) Softening of the metal
3) Improved corrosion resistance

A

1,2

69
Q

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

A

The discontinuity is found in a highly stress area of the part.

70
Q

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

A

Upward, or in a forward direction.

71
Q

Which statement regarding aircraft bolts is correct?

A

In general, bolt grip lengths should equal the material thickness.

72
Q

In performing a dye penetrant inspection, the developer

A

Acts as a blotter to produce a visible indication

73
Q

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

A

25 to 50 percent

74
Q

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

1) Porous plastics
2) Ferrous metals
3) Nonferrous metals
4) Smooth primer sealed wood
5) nonporous plastics

A

2,3,5

75
Q

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,

A

Both no.1 and no.2 are true

76
Q

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

A

micrometer

77
Q

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

A

Slowly moving the part out of an ac magnetic field of sufficient strength.

78
Q

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

A

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

79
Q

What tool is generally used to set a divider to set an exact dimension?

A

Machinist scale

80
Q

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

A

1,2,3, and 5

81
Q

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

A

Reveal all possible defects

82
Q

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

A

1/2 inch

83
Q

(Refer to Figure 47.) What is the measurement reading on the vernier caliper scale?

A

1.436 inches

84
Q

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

A

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

85
Q

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

A

micrometer caliper

86
Q

Magnetic particle inspection is used primarily to detect

A

Flaws on or near the surface

87
Q

The pattern for an inclusion is a magnetic particle build up forming

A

Parallel lines

88
Q

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

A

thickness gauge

89
Q

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

A

Intergranular

90
Q

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

A

Continuous

91
Q

To detect a minute crack using dye penetrant inspection usually requires

A

A longer-than-normal penetrating time

92
Q

Which number represents the vernier scale graduation of a micrometer?

A

0.0001

93
Q

identify the weld caused by an excessive amount of acetylene

A

3

General (12 decks)

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