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SHEETMETAL & NON- SHEETMETALALIC STRUCTURE

(1) When performing a ring (coin tap) test on composite structure, a change in sound may be due to damage or to transition to a different internal structure

(2) The extent of separation damage in composite structures is most accurately measured by a ring (coin tap) test

Regarding the above statements,

Both No.1 and No.2 are true

Only No.2 is true

Only No.1 is true

Clad aluminum alloys are used in aircraft because they

Can be heat treated much easier than the other forms of aluminum

Are less subject to corrosion than uncoated aluminum alloys

Are stronger than unclad aluminum alloys

A well-designed rivet joint will subject the rivets to

Shear loads

Compressive loads

Tension loads

If a streamline cover plate is to be hand formed using a form block, a piece of dead soft aluminum should first be placed over the hollow portion of the mold and securely fastened in place. The bumping operation should be

Distributed evenly over the face of the aluminum at all times rather than being started at the edges or center.

Started by tapping the aluminum lightly around the edges and gradually working down into the center

Started by tapping the aluminum in the center until it touches the bottom of the mold and then working out in all directions

If it is necessary to compute a bend allowance problem and bend allowance tables are not available, the neutral axis of the bend can be

Represented by the actual length of the required material for the bend

Found by subtracting the stock thickness from the bend radius

Found by adding approximately one-half of the thickness to the bend radius

The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked

One radius from the bend tangent line that is placed under the brake

One radius from either bend tangent line

One-half radius from either bend tangent line

On a sheet metal fitting layout with a single bend, allow for stretching by

Adding the setback to each leg b.

Subtracting the setback from one leg

Subtracting the setback from both legs

When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?

Water displacing oil

Water only

Water soluble oil

What is indicated by a black 'smoky residue streaming back from some of the rivets on an aircraft?

The rivets were excessively work hardened during installation

Exfoliation corrosion is occurring inside the structure

Fretting corrosion is occurring between the rivets and the skin

What type of bit should be used to drill holes in Plexiglas?

A specially modified twist drill

A standard twist drill

A dulled twist drill

What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?

Paint the outside area with several coats of exterior paint

Prime the repair with a corrosion inhibitor and seal from the atmosphere

None. Honeycomb is usually made from a man-made or fibrous material which is not susceptible to corrosion

Mild steel rivets are used for riveting

Magnesium parts

Steel parts

Nickel- steel parts

A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the

Shape of the head

Method of installation

Number of locking collar grooves

What is the minimum spacing for a single row of aircraft rivets?

Three times the diameter of the rivet shank

Three times the length of the rivet shank

Two times the diameter of the rivet shank

The coefficient of expansion of most plastic enclosure materials is

Greater than steel but less than aluminum

Less than either steel or aluminum

Greater than both steel and aluminum

What should be the included angle of a twist drill for soft metals?

118°

90°

65°

Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture?

Rivet gauge, or transverse pitch is the distance between the

Centers of rivets in adjacent rows

Centers of adjacent rivets in the same row

Heads of rivets in the same row

Which statement is true regarding a cantilever wing?

It has nonadjustable lift struts

No external bracing is needed

It requires only one lift strut on each side

Fiberglass damage that extends completely through a laminated sandwich structure

Must be filled with resin to eliminate dangerous stress concentrations

May be filled with putty which is compatible with resin

May be repaired

Threaded rivets (Rivnuts) are commonly used to

Join two or more pieces of sheet metal where shear strength is desired

Attach parts or components with screws to sheet metal

Join two or more pieces of sheet metal where bearing strength is desired

What should be the included angle of a twist drill for hard metal?

100°

118°

90°

When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be

The shear strength of the riveted joint

To use rivet spacing similar to a seam in the skin

That the bond between the patch and the skin is sufficient to prevent dissimilar metal corrosion

A factor which determines the minimum space between rivets is the

Length of the rivets being used

Thickness of the material being riveted

Diameter of the rivets being used

What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?

Bleeder

Breather

Release

If a new safety belt is to be installed in an aircraft, the belt must conform to the strength requirements in which documents?

STC 1282

14 CFR Part 39

TSO C22

What is one of the determining factors which permit machine countersinking when flush riveting?

Thickness of the material is greater than the thickness of the rivet head

Thickness of the material is less than the thickness of the rivet head

Thickness of the material and rivet diameter are the same

When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that

The grain is parallel to the skin

The grain is perpendicular to the skin

it is about 1/8 inch undersize to allow sufficient bonding material to be applied

Under certain conditions, type a rivets are not used because of their

High alloy content

Tendency toward embrittlement when subjected to vibration

Low strength characteristics

Which rivet may be used as received without further treatment?

2017-Т3

2117-Т3

2024-T4

Cabin upholstery materials installed in current standard category airplanes must

Meet the requirements prescribed in Part 43

Be at least flame resistant

Be fireproof

A rivet set used to drive MS20470 rivets should

Be nearly flat on the end, with a slight radius on the edge to prevent damage to the sheet being riveted

Have the same radius as the rivet head

Have a slightly greater radius than the rivet head

The general rule for finding the proper rivet dimeter is

Three times the thickness of the thickest sheet

Three times the thickness of the materials to be joined

Two times the rivet length

MS20426AD-6-5 indicates a countersunk rivet which has

A shank length 5/32 inch (excluding head)

A shank length of 5/16 inch (excluding head)

An overall length of 5/16 inch

Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying

A piece of resin-impregnated glass fabric facing

A sheet of polyethylene over the abraded surface and one or more coats of resin cured with infrared heat lamps

One or more coats of suitable resin (room-temperature catalyzed) to the surface

Fiberglass laminate damage that extends completely through one facing and into the core

Cannot be repaired

Requires the replacement of the damaged core and facing

Can be repaired by using a typical metal facing patch

When straightening members made of 2024-T4, you should

Straighten cold and reinforce

Straighten cold and anneal to remove stress

Apply heat to the inside of the bend

The classification for high tensile strength fiberglass used in aircraft structure is

E-glass

G-glass

S-glass

Repairs o splices involving stringers on the lower surface of stressed skin metal wings are usually

Permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface

Not permitted

Permitted only if the damage does not exceed 6 inches in any direction

Which is correct concerning the use of a file?

A smoother finish can be obtained by using a double-cut file than by using a single cut use

The terms 'double-cut' and 'second-cut' have the same meaning in reference to files

Apply pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum

The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in

Tenths of an inch

Sixteenths of an inch

Hundredths of an inch

Heat-treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration

Must be reheat treated before use

Must be discarded

May be returned to refrigeration and used later without reheat treatment

Parts fabricated from Alclad 2024-T3 aluminum sheet stock must have all

Bends made with a small radius to develop maximum strength

Bends 90° to the grain

Scratches, kinks, tool marks, nicks, etc., must be held to a minimum

Metal fasteners used with carbon/graphite composite structures

May be constructed of any of the metals commonly used in aircraft fasteners

Must be constructed of material such as titanium or corrosion resistant steel

Must be constructed of high strength aluminum-lithium alloy

The part of a replacement honeycomb core that must line up with the adjacent original is the

Cell edge

Cell side

Ribbon direction

Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called

Longerons and stringers

Spars and ribs

Spars and stringers

When drilling stainless steel, the drill used should have an Included angle of

190° and turn at a low speed

118 and turn at a high speed

140° and turn at a low speed

What is the minimum edge distance for aircraft rivets?

Two times the diameter of the rivet head

Two times the diameter of the rivet shank

Three times the diameter of the rivet shank

The identifying marks on the heads of aluminum alloy rivets indicate the

Degree of dimensional and process control observed during manufacture

Head shape, shank size, material used, and specifications adhered to during manufacture

Specific alloy used in the manufacture of the rivets

A piece of sheet metal is bent to a certain radius. The curvature of the bend is referred to as the

Bend radius

Neutral line

Bend allowance

The installation of Cherrymax and Olympic-lok rivets is accomplished by utilizing

Rivet gun, special rivet set, and bucking bar

A pulling tool

Ordinary hand tools

Which is an identifying characteristic of acrylic plastics?

Acrylic has a yellowish tint when viewed from the edge

Acetone will soften plastic, but will change its color

Zinc chloride will have no effect

The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the

Minimum radius of bend

Bend allowance

Maximum radius of bend

What is the most common method of cementing transparent plastics?

Heat method

Bevel method

Soak method

Which rivet is used for riveting nickel-steel alloys?

2024-aluminum

Monel

Mild steel

If an aircraft's transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be

Hazing

Crazing

Brinelling

Which of the following drill bit types work best when drilling an aramid fiber (Kevlar©) composite laminate?

Carbide W-point

Tool steel with standard grind

Diamond dust coated

The purpose of a joggle is to

Increase obstruction for a sheet or an extrusion

Decrease the weight of the part and still retain the necessary strength

Allow clearance for a sheet an extrusion

What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?

To accelerate age hardening

To relieve internal stresses

To retard age hardening

Which fiber to resin (percent) ration for advanced composite wet lay-ups is generally considered the best for strength?

40:60

60:40

50:50

Sandwich panels made of metal honeycomb construction ae used on modern aircraft because this type of construction

Has a high strength to weight ratio

May be repaired by gluing replacement skin to the inner core material with thermoplastic resin

Is lighter than single sheet skin of the same strength and is more corrosion resistant

Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?

If rivets show no visible distortion, further investigation is unnecessary

If bearing failure has occurred, the rivet shanks will be joggled

If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction

The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in

Hundredths of an inch

Tenths of an inch

Sixteenth of an inch

A piece of flat stock that is to be bent to a closed digit 15° must be bent through an angle of

165°

105°

90°

What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?

To provide access for inspection of structural attachments

To join and reinforce intersecting structural members

To hold structural members in position temporarily until the permanent attachment has been completed

A sheet metal repair is to be made using two pieces of 0.0625-inch aluminum riveted together. All rivet holes are drilled for 1/8-inch rivets. The length of the rivets to be used will be

5/16 inch

3/16 inch

5/32 inch

When making repairs to fiberglass, cleaning of the area to be repaired is essential for a good bond. The final cleaning should be made using

Soap, water, and a scrub brush

A thixotropic agent

MEK (methyl ethyl ketone)

What type loads cause the most rivet failures?

Bearing

Shear

Head

Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally

Repairable, using approved methods

Not repairable, but must be replaced when damaged or deteriorated

Repairable, except when subjected to compressive loads

Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the

Increased possibility of fretting corrosion in the fastener

Possibility of causing delamination

Difficulty in forming a proper shop head

When comparing the machining techniques for stainless steel sheet material to those for aluminum alloy sheet, it is normally considered good practice to drill the stainless steel at a

Higher speed with less pressure applied to the drill

Lower speed with less pressure applied to the drill

Lower speed with more pressure applied to the drill

How does acoustic emission testing detect defects in composite materials?

By analyzing ultrasonic signals transmitted into the parts being inspected

By picking up the 'noise of any deterioration that may be present

By creating sonogram pictures of the areas being inspected

One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to

Perform a chemical composition analysis

Test the viscosity of the resin immediately after mixing

Have you mixed enough for a test sample

If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be

Buffed with a clean, soft, dry cloth

Covered with a thin coat of wax

Polished with rubbing compound applied with a damp cloth

The length of time that a catalyzed resin will remain in a workable state is called the

Shelf life

Service life

Pot life

Which is considered good practice concerning the installation of acrylic plastics?

When nuts and bolts are used, the plastic should be installed hot and tightened to a firm fit before the plastic cools

When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided

When rivets or nuts and bolts are used, slotted holes are not recommended

The primary alloying agent of 2024-T3 is indicated by the number

How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels?

1. Greater concentrations of resin in edges and corners

2. Improved strength to weight ratio

3. Less density

4. Lower stress concentrations

1,2 and 4

2,3, and 4

All of the above

Alloy 2117 rivets are heat treated

By the manufacturer but require reheat treatment before being driven

To a temperature of 910 to 930°F and quenched in cold water

By the manufacturer and do not require heat treatment before being driven

One look of the main advantages of Hi-Lok type fasteners over earlier generations is that

They can be installed with ordinary hand tools

They can be removed and reused again

The squeezed can be installed with ordinary hand tools

The most important Factors needed to make a flat pattern layout are

Radius, thickness, and mold line

The lengths of the legs (flat sections)

Radius, thickness, and degree of bend

A potted compound repair on honeycomb can usually be made on damages less than

4 inches in diameter

2 inches in diameter

1 inch in diameter

Shallow scratches in sheet metal may be repaired by

Burnishing

Buffling

Stop drilling

The monocoque fuselage relies largely on the strength of

Longerons and formers

Skin or covering

Bulkheads and longerons

You can distinguish between aluminum and aluminum alloy by

Testing with an acetic solution.

Filing the metal

Testing with a 10 percent solution of caustic soda

When bending metal, the material on the outside of the curve stretches while the material on the inside of the curve compresses. That part of the material which is not affected by either stress is the

Bend tangent line

Neutral line

Mold line

How many MS20470 AD-4-6 rivets will be required to attach a 10 x 5 inch plate, using a single row of rivets, minimum edge distance and 4D spacing?

When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and self-locking nuts, the nuts should be

Tightened to a firm fit, plus one full turn.

Tightened to a firm fit, then backed off one full turn

Tightened to a firm

When repairing puncture-type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to

Two times the thickness of the metal

Whatever is desired for a neat, clean Appearance

100 times the thickness of the metal

Fiberglass laminate damage out exceeding the first layer or play can be repaired by

Filling with a putty consisting of a compatible resin and clean, short glass fibers.

Trimming the rough edges and sealing with paint

Sanding the damaged area until aerodynamic smoothness is obtained

Most rivets used in aircraft construction have

Smooth heads without markings

Dimples

A raised dots

Composite fabric material is considered to be the strongest in what direction?

Fill

Bias

Wrap

The markings on the head of a Dzus fastener identify the

Body diameter, type of head, and length of the fastener

Body type, head diameter, and type of material

Manufacturer and type of material

The strength and stiffness of a properly constructed composite buildup depends primarily on

The ability of the fibers to transfer stress to the matrix

60 percent matrix to 40 percent fiber ratio

The orientation of the plies to the load direction

When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?

Treat the surfaces to be riveted together with a process called anodic treatment

Avoid the use of dissimilar metals by redesigning the unit according to the recommendations outlined in AC 43.13-1A

Place a protective separator between areas of potential electrical difference

A DD rivet is heat treated before use to

Relieve internal stresses

Harden and increase strength

Soften to facilitate riveting

When a piece of aluminum alloy is to be bent using minimum radius for the type and thickness of material

The layout should be made so that the bend will be 90° to the grain of the sheet

The piece should be bent slowly to eliminate cracking

Less pressure than usual should be applied with the movable (upper) clamping bar

Which of the following are generally characteristic of carbon/graphite fiber composites?

1. Flexibility

2. Stiffness

3. High compressive strength

4. Corrosive effect in contact with aluminum

5. Ability to conduct electricity

1 and 3

1,3 and 5

2,3 and 4

The classification for fiberglass reinforcement material that has high resistivity and is the most common is

S-glass

E-glass

G-glass

When repairing large, flat surfaces with polyester resins, warping of the surface is likely to occur. One method of reducing the amount of warpage is to

Add an extra amount of catalyst to the resin

Use less catalyst than normal so the repair will be more flexible

Use short strips of fiberglass in the bonded repair

Joggles in removed rivet shanks would indicate partial

Shear failure

Torsion failure

Bearing failure b.

Joggles in removed rivet shanks would indicate partial

Shear failure

Torsion failure

Bearing failure b.

The dimensions of an MS20430AD-4-8 rivet are

1/8 inch in diameter and ¼ inch long

1/8 inch in diameter and1/2 inch long

4/16 inch in diameter and 8/32 inch long

When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate

Separation of the laminates

Less than full strength curing of the matrix

An area of too much matrix between fiber layers

Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels?

1. Microballoons

2. Flox

3. Chapped fibers

1 and 3

1,2, and 3

2 and 3

Which procedure is correct when using a reamer to finish a drilled hole to the correct size?

Turn the reamer in the cutting direction when enlarging the hole and in the opposite direction to remove from the hole

Which procedure is correct when using a reamer to finish a drilled hole to the correct size?

Turn the reamer only in the cutting direction

Turn the reamer in the cutting direction when enlarging the hole and in the opposite direction to remove from the hole

Apply considerable pressure on the reamer when starting the cut and reduce the pressure when finishing the cut

Which part (s) of a semi-monocoque fuselage prevents (s) tension and compression from bending the fuselage?

Bulkhead and skin

Longerons and stringers

The fuselage covering

Which part (s) of a semi-monocoque fuselage prevents (s) tension and compression from bending the fuselage?

Bulkhead and skin

Longerons and stringers

The fuselage covering

Which part (s) of a semi-monocoque fuselage prevents (s) tension and compression from bending the fuselage?

Bulkhead and skin

Longerons and stringers

The fuselage covering

What is generally the best procedure to use when removing a solid shank rivet?

Drill through the manufactured head and shank with a drill one size smaller than the rivet and remove the rivet with a punch

Drill through the manufactured head and shank with a shank size drill and remove the rivet with a punch

Drill to the base of the manufactured rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch

What is generally the best procedure to use when removing a solid shank rivet?

Drill through the manufactured head and shank with a drill one size smaller than the rivet and remove the rivet with a punch

Drill through the manufactured head and shank with a shank size drill and remove the rivet with a punch

Drill to the base of the manufactured rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch

What is the minimum edge distance allowed for aluminum alloy single lap sheet splices containing a single row of rivets as compared to a joint with multiple rows, all rivets being equal I diameter?

The minimum edge distance for the single row is equal to that for the multiple row

The minimum edge distance for the single row is less than that for the multiple row

The minimum edge distance for the single row is greater than that for the multiple row

When an MS20470D rivet is installed, its full shear strength is obtained

By the cold working of the rivet metal in forming a shop head

Only after a period of age hardening

By heat treating just prior to being driven

A single-lap sheet splice is to be used to repair a section of damaged aluminum skin. If a double row of 1/8-inch rivets is used, the minimum allowable overlap will be

½ inch

¾ inch

13/16 inch

The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-sheet, drilled with a No. 30 drill, is

5/16 inch

7/16 inch

¼ inch

The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-sheet, drilled with a No. 30 drill, is

5/16 inch

7/16 inch

¼ inch

The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-sheet, drilled with a No. 30 drill, is

5/16 inch

7/16 inch

¼ inch

The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-sheet, drilled with a No. 30 drill, is

5/16 inch

7/16 inch

¼ inch

A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet holes are drilled for 3/32-inch rivets. The length of the rivets to be used will be

1/8 inch

¼ inch

5/16 inch

A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet holes are drilled for 3/32-inch rivets. The length of the rivets to be used will be

1/8 inch

¼ inch

5/16 inch

A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet holes are drilled for 3/32-inch rivets. The length of the rivets to be used will be

1/8 inch

¼ inch

5/16 inch

A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet holes are drilled for 3/32-inch rivets. The length of the rivets to be used will be

1/8 inch

Unless otherwise specified, the radius of a bend is the

Inside radius plus one-half the thickness of the metal being formed

Radius of the metal axis plus one-half the thickness of the metal being formed

Inside radius of the metal being formed

Unless otherwise specified, the radius of a bend is the

Inside radius plus one-half the thickness of the metal being formed

Radius of the metal axis plus one-half the thickness of the metal being formed

Inside radius of the metal being formed

Which of the following need not be considered when determining minimum rivet spacing?

Rivet length

Rivet diameter

Type of material being riveted

The preferred way to make permanent repairs on composites is by

Bonding on metal or cured composite patches

Riveting on metal or cured composite patches

Laminating on new repair plies

Which of these methods may be used to inspect fiberglass/ honeycomb structures for entrapped water?

1. Acoustic emission monitoring

2. X-ray

3. Backlighting

Which of these methods may be used to inspect fiberglass/ honeycomb structures for entrapped water?

1. Acoustic emission monitoring

2. X-ray

3. Backlighting

1 and 2

1 and 3

2 and 3

Which rivets should be selected to join two sheets of .032-inch aluminum?

MS20425D-4-3

MS20470AD-4-4

MS20455DD-5-3

Which rivets should be selected to join two sheets of .032-inch aluminum?

MS20425D-4-3

MS20470AD-4-4

MS20455DD-5-3

Select the alternative which best describes the function of the flute section of a twist drill

Provides a method for cooling oil to be delivered to the cutting surface

Forms the cutting edges of the drill point

Forms the area where the drill bit attaches to the drill motor

Which of the following are generally characteristic of aramid fiber (Kevlar) composites?

1. High tensile strength

2. Flexibility

3. Stiffness

4. Corrosive effect in contact with aluminum

5. Ability to conduct electricity

1 and 2

1, 3 and 5

2, 3 and 4

One method of inspecting a laminated fiberglass structure that has been subjected to damage is to

Use dye-penetrant inspection procedures, exposing the entire damaged area to the penetrant solution.

Use an eddy current probe on both sides of the damaged are

Strip the damaged area of all paint and shine a strong light through the structure

One method of inspecting a laminated fiberglass structure that has been subjected to damage is to

Use dye-penetrant inspection procedures, exposing the entire damaged area to the penetrant solution.

Use an eddy current probe on both sides of the damaged are

Strip the damaged area of all paint and shine a strong light through the structure

The length of a rivet to be used to join a sheet of .032- inch and .064-inch aluminum alloy should be equal to

Two times the rivet diameter plus .064 inch

One and one-half times the rivet diameter plus .096 inch

Three times the rivet diameter plus.096 inch

The length of a rivet to be used to join a sheet of .032- inch and .064-inch aluminum alloy should be equal to

Two times the rivet diameter plus .064 inch

One and one-half times the rivet diameter plus .096 inch

Rivet pitch is the distance between the

Centers of adjacent rivets in the same row

Centers of rivets in adjacent rows

Heads of rivets in the same row

A category of plastic material that is capable of softening or flowing when reheated is described as a

Thermoset

A category of plastic material that is capable of softening or flowing when reheated is described as a

Thermoset

Thermocure

Thermoplastic

A category of plastic material that is capable of softening or flowing when reheated is described as a

Thermoset

Thermocure

Thermoplastic

A category of plastic material that is capable of softening or flowing when reheated is described as a

Thermoset

Thermocure

Thermoplastic

Which rivet is used for riveting magnesium alloy structures?

5056 aluminum

Mild steel

Monel

Which rivet is used for riveting magnesium alloy structures?

5056 aluminum

Mild steel

Monel

Proper pre-preg composite lay-up curing is generally accomplished by

1. Applying external heat

2. Room temperature exposure

3. Adding a catalyst or curing agent to the resin

4. Applying pressure

2 and 3

1 and 4

1, 2, and 4

The flat layout or blank length of a piece of metal from which a simple L-shaped bracket 3 inches by 1 inch is to be bent depends upon the radius of the desired bend. The bracket which will require the greatest amount of material is one which has a bend radius of

1/8 inch

½ inch

¼ inch

1/8 inch

½ inch

¼ inch

1/8 inch

½ inch

¼ inch

What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?

Fill clock (or compass)

Bias clock (or compass)

Warp clock (or compass)

What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?

Fill clock (or compass)

Bias clock (or compass)

Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in

Improved wear resistance to the structure

Restored strength and flexibility

An unairworthy repair

The aluminum alloys used in aircraft construction are usually hardened by which method?

Cold-working

Aging

Heat treatment

The shop head of a rivet should be

One and one-half times the diameter of the rivet shank

One-half times the diameter of the rivet shank

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