Materials and Process

Question 1

Liquid penetrant inspection methods may be used on which of the following?
1. porous plastics.
2. ferrous metals.
3. nonferrous metals.
4. smooth primeer-sealed wood.
5. nonporous plastics.

Answer 1

2,3,5

Question 2

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

Answer 2

1,2,3, and 5

Question 3

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 characteristics.

Answer 3

3

Question 4

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

Answer 4

High permeability low retentivity

Question 5

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

Answer 5

It maybe used with steels which have been heat treated for stressed application

Question 6

A 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?

Answer 6

Metallic ring test

Question 7

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

Answer 7

Wet and dry process materials

Question 8

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.

Answer 8

3

Question 9

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

Answer 9

Slowly moving out of an ac magnetic field of sufficient strength

Question 10

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

Answer 10

45 degrees

Question 11

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.

Answer 11

1,4,5,6

Question 12

To detect a minute crack using dye penetrant inspection usually requires

Answer 12

A longer than normal penetrating time

Question 13

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

Answer 13

The size and shape of the discontinuities being look for

Question 14

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

Answer 14

Reveal all possible defects

Question 15

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

Answer 15

A large disruption in the magnetic field

Question 16

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

Answer 16

Was not thoroughly washed before the developer was applied

Question 17

(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,

Answer 17

Both no. 1 and 2 are true

Question 18

The pattern for an inclusion is a magnetic particle buildup forming

Answer 18

Parallel lines

Question 19

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

Answer 19

Water base solvents only

Question 20

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

Answer 20

The discontinuity is found in a nonstressed area of the part

Question 21

In performing a dye penetrant inspection, the developer

Answer 21

Acts as a blotter to produce a visible indication

Question 22

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

Answer 22

Defects perpendicular to the long axis of the part

Question 23

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

Answer 23

Defects parallel to the long axis of the part

Question 24

Defects perpendicular to the long axis of the part

Answer 24

Both no. 1 and 2 are true

Question 25

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

Answer 25

Intergranular

Question 26

Which of the following describe the effects of annealing steel and aluminum alloys? 1. decrease in internal stress. 2. softening of the metal. 3. improved corrosion resistance.

Answer 26

1 , 2

Question 27

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

Answer 27

Case hardening

Question 28

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

Answer 28

Case hardening

Question 29

Normalizing is a process of heat treating

Answer 29

Iron base metals only

Question 30

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 artifically aged. 2. The metals become stress corrosion cracked. 3. The metals become cold worked, strain or work hardened.

Answer 30

3

Question 31

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

Answer 31

Can significally alter a metals properties in the reheated area

Question 32

Why is steel tempered after being hardened?

Answer 32

To relieve its internal stresses and reduce its brittleness

Question 33

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

Answer 33

3003-F

Question 34

Which material cannot be heat treated repeatedly without harmful effects?

Answer 34

Clad aluminum alloys

Question 35

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

Answer 35

Slow cooling; low strength

Question 36

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

Answer 36

Clean dry threads

Question 37

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

Answer 37

Stainless steel

Question 38

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

Answer 38

Upward or in forward direction

Question 39

Alclad is a metal consisting of

Answer 39

Pure aluminum surface layers on an aluminum alloy core

Question 40

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

Answer 40

Subject to rotation

Question 41

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

Answer 41

3

Question 42

Aircraft bolts with a cross or asterisk marked on the bolthead are

Answer 42

Standard steel bolts

Question 43

Which statement regarding aircraft bolts is correct?

Answer 43

In general, bolt grip lengths should equal the material thickness

Question 44

Generally speaking, bolt grip lengths should be

Answer 44

Equal to the thickness of the material which is fastened together

Question 45

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

Answer 45

AC 43.13-1B

Question 46

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

Answer 46

3

Question 47

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

Answer 47

Change washers and try again

Question 48

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

Answer 48

AN corrosion resistant bold

Question 49

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

Answer 49

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

Question 50

Where is an AN clevis bolt used in an airplane?

Answer 50

Only for shear load application

Question 51

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

Answer 51

NAS close tolerance bolt

Question 52

The core material of Alclad 2024-T4 is

Answer 52

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

Question 53

The aluminum code number 1100 identifies what type of aluminum?

Answer 53

99% commercially pure aluminum

Question 54

Aircraft bolts are usually manufactured with a

Answer 54

Class 3 fit for the threads

Question 55

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

Answer 55

The major alloying element

Question 56

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

Answer 56

By the use of unthreaded fiber locking insert

Question 57

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

Answer 57

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

Question 58

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

Answer 58

3

Question 59

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

Answer 59

2

Question 60

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

Answer 60

To relieve internal stresses developed within the base metal

Question 61

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

Answer 61

Remove old weld and reweld the joint

Question 62

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

Answer 62

Cracking adjacent to the weld

Question 63

Select a characteristic of a good gas weld.

Answer 63

The weld should taper off smoothly into the base metal

Question 64

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

Answer 64

½ inch

Question 65

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

Answer 65

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

Question 66

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

Answer 66

Butt

Question 67

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

Answer 67

Double butt

Question 68

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

Answer 68

Lap

Question 69

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

Answer 69

25 to 50 percent

Question 70

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

Answer 70

Dial indicator

Question 71

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

Answer 71

ans. 0.2851

Question 72

Identify the correct statement

Answer 72

Dividers do not provide reading when used as a measuring device

Question 73

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

Answer 73

1.436 inches

Question 74

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

Answer 74

Thickness gauge

Question 75

Which number represents the vernier scale graduation of a micrometer?

Answer 75

.0001

Question 76

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

Answer 76

Combination set

Question 77

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

Answer 77

.3004

Question 78

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

Answer 78

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

Question 79

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

Answer 79

.2782

Question 80

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

Answer 80

Machinist scale

Question 81

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

Answer 81

Gauge block

Question 82

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

Answer 82

Micrometer caliper

Question 83

The side clearances of piston rings are measured with a

Answer 83

Thickness gauge

Question 84

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

Answer 84

Telescopic gauge and micrometer

Question 85

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

Answer 85

Thickness gauge

Question 86

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

Answer 86

Thickness gauge

Question 87

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

Answer 87

Micrometer

Question 88

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

Answer 88

Micrometer caliper

Question 89

Magnetic particle inspection is used primarily to detect

Answer 89

Flaws on or near the surface

Question 90

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

Answer 90

Ultrasonic inspection

Question 91

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?

Answer 91

Eddy current inspection

Question 92

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

Answer 92

Continuous

Question 93

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

Answer 93

Basic alloying element