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My General Oral Questions > Materials and Processes > Flashcards

Materials and Processes Flashcards

1
Q

What does the magnetic particle inspection basic process consist of?

A

The basic process consists of
1) magnetizing a part
2)applying ferromagnetic particles to the surface to be inspected.
If a discontinuity is present, the particles will form a recognizable pattern on the surface.

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2
Q

What nondestructive testing methods could be used for detecting surface cracks in aluminum fittings?

A

Dye penetrant, radiography (x-ray), eddy current, ultrasonic testing, and visual inspection.

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3
Q

What occurs during the preparation stages when penetrant inspection liquid is applied to, and then removed, from a part that is cracked?

A

The penetrating liquid enters the crack and remains there in order to make the crack visible after developer is applied.

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4
Q

What is the procedure for performing penetrant inspection?

A

1) Clean the surface
2) Apply penetrant
3) Remove the penetrant with emulsifier or cleaner
4) Dry the part
5) Apply developer
6) Inspect and interpret results

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5
Q

How may AN standard steel bolts be identified?

A

AN bolts can be identified by the code markings on the bolt head

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6
Q

What do the markings on the heads of solid shank rivets indicate?

A

The material of which they are made and their strength

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7
Q

How can the recommended torque for a bolt or nut be determined when torque values are not called out in the maintenance procedure?

A

From the information contained in the standard torque table.

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8
Q

What does the grip length of a bolt correspond to?

A

The thickness of the material being fastened with the bolt.

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9
Q

What may be accomplished to prevent heat treated aluminum alloy rivets from becoming hard after the quenching sequence?

A

Store the rivets in the refrigerator at a temperature lower than 32 degrees (F). They will remain soft for several days.

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10
Q

Where may self locking nuts NOT be used?

A

At joints which subject either the nut or bolt to rotation.

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11
Q

What is the difference between a general purpose bolt and a close tolerance bolt?

A

Close tolerance bolts are machines more accurately than general purpose bolts.

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12
Q

What type of cable is commonly used in primary control systems?

A

Extra flexible 7x9 stainless steel cable

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13
Q

How is work hardening obtained?

A

By cold working metal

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14
Q

What width would a welding bead have and what should be the depth of penetration in a butt weld?

A

The bead width should be 3 to 5 times the thickness of the base metal and 100 percent penetration for a butt weld.

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15
Q

What are the undesirable characteristics of a cold weld?

A

A cold weld has improper penetration with rough and irregular cold laps not feathered into the base metal

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16
Q

What are the penetration requirements for a fillet weld?

A

A fillet weld should be 25 to 50 percent of the thickness of the base metal

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17
Q

What precision measuring instruments are used to measure outside dimensions?

A

Outside micrometer calipers and Vernier calipers

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18
Q

Why should a micrometer be periodically calibrated?

A

1) Continually sliding objects between the anvil and spindle may wear the surfaces
2) If it is dropped, its accuracy may be affected
3) If the spindle is overtighened, the frame may be permanently sprung (bent)

19
Q

Why is alloy steel that is responsive to heat treatment usually less suitable for welding?

A

Because of its tendency to become brittle and lose its ductility in the welded area

20
Q

What is the main difference between thermoplastic and thermosetting resins(plastics)?

A

Thermoplastic resins can be softened by heat and become hard again when cooled down. Thermosetting resins do not soften when heated and will char and burn rather than melt.

21
Q

What are some of the purposes for which thermoplastic and thermosetting resins are commonly used in modern aircraft?

A

Thermoplastic acrylic (plexiglas) is commonly used for windshields and side windows.
Thermosetting resins are commonly used as the matrix material in composites.

22
Q

Name one substance commonly used as the matrix material in structural composite laminates.

A

1) Aramid (Kevlar)
2) Fiberglass
3) Graphite (or carbon) fiber

23
Q

Name one substance commonly used as the matrix material in structural composite laminates

A

Polyester resin and Epoxy resin

24
Q

Name on advantage of using pre-impregnated materials in the construction of repair of composite components (Besides saving time)

A

1) Prepreg fabric contains the proper amount of matrix
2) The reinforcing fibers are completely and evenly permeated with matrix.
3) The matrix has the correct proportions of resin and hardener.

25
Q

Which nondestructive testing method can be performed without removing the surface coatings such as primer, paint, and anodized films and is effective in detecting surface and subsurface corrosion?

A

Eddy Current inspection method

26
Q

Which steel alloy is noted for its toughness and is most commonly used for aircraft tubular structure, such as frame members, engine mounts, landing gear parts, and other structural parts?

A

Chrome-Molybdenum steel

27
Q

Which case hardening process is accomplished on steel alloys, after heat treating to produce wear resistant surface on engine parts, such as crankshafts?

A

Nitriding

28
Q

What portable hardness tester is commonly used for testing aluminum alloys, copper, brass, or other relatively soft materials

A

Barcol Tester

29
Q

In what class of threaded fit are aircraft bolts commonly manufactured?

A

Class 3, Medium fit

30
Q

Name at least three properties of metals.

A

Hardness, toughness, elasticity, ductility, malleability, strength, brittleness, fusibility, conductivity, thermal expansion.

31
Q

What is the term used that applies to the group of metals that has iron as its principle constituent?

A

Ferrous

32
Q

In the aluminum alloy 2XXX through 8XXX series, as in 2024-T3, what does the first digit indicate?

A

The primary alloying element

33
Q

Name two types of hardness testers used on steel and other alloys such as aluminum

A

Rockwell, Brinnell, Barcol

34
Q

What is the term used that applies to a combination of materials such as fiber, whisker or particle, surrounded and held in place by a resin forming a structure?

A

Composite Structure

35
Q

What is another commonly known name for an aramid material?

A

Kevlar

36
Q

Name four advantages of composites?

A

1) High strength to weight ratio
2) Fiber to fiber transfer of stress allowed by chemical bonding
3) stiffness to density ratio 3.5 to 5 times that of steel or aluminum
4) Longer life than metals
5) Higher corrosion resistance
6) Tensile strength 4 to 6 times that of steel or aluminum
7) Greater design flexibility
8) Bonded construction eliminates joints and fasteners
9) Easily repairable

37
Q

What are the two general types of self locking nuts?

A

All metal, and fiber lock or elastic stop nut

38
Q

What are two basic types of washers?

A

Plain, lock and special

39
Q

What hardware is used as a threaded bushing to repair threads?

A

Helicoils

40
Q

When referring to a standard torque chart, how can a 1/4 -28 sized bolt be defined?

A

It is defined as a 1/4” diameter bolt with a thread count of 28 threads per inch.

41
Q

A solid rivet’s length is measured in what fractional increments?

A

Rivet length is measured in 1/32 inch increments

42
Q

A solid rivet’s diameter is measured in what fractional increments?

A

Rivet diameter is measured in 1/16 inch increments

43
Q

The diameter of an AN standard steel bolt, as in the part number, AN3-5 is measured in what fractional increment?

A

1/16 of an inch. The AN3 is a 3/16 inch diameter bolt.

44
Q

The length of AN standard steel bolts, as in the part number AN3-5, is measured in what fractional increment?

A

1/8 of an inch. The AN3-5 is a 5/8 inch bolt in length.

My General Oral Questions (9 decks)

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