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Mod 6: Materials & Hardware > Book Questions > Flashcards

Book Questions Flashcards

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1
Q

The form of heat treatment that removes some of the hardness from hardened steel is called _____.

A

Tempering

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2
Q

The form of heat treatment that relieves strains in a metal is called _____.

A

Normalising

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3
Q

The form of heat treatment that softens a metal is called _____.

A

Annealing

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4
Q

The form of heat treatment that hardens the surface of a metal while leaving the core relatively soft and tough is called _____.

A

Case Hardening

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5
Q

A pure metal, as distinguished from an alloy, ____ normally hardened by heat treatment.

(a) is
(b) is not

A

(b) is not

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6
Q

Two methods of case hardening steel are:

A

Carburising

Nitriding

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7
Q

A steel part is nitrided by heating it in an atmosphere containing ______ gas

A

Ammonia

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8
Q

Aluminium alloy is softened by heating it in an oven and cooling it ______

(Rapidly or slowly)

A

Slowly

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9
Q

When an aluminium alloy part is heated in an oven and then quenched, it is said to be ______ heat treated.

A

Solution

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10
Q

Artificial aging is done by holding a heat-treated aluminium alloy part at an elevated temperature for a specified length of time. THis process is called ____ heat treating.

A

Precipitation

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11
Q

When an aluminium alloy part is removed from the heat treatment oven and quenched, it is relatively soft. Over a period od a day or so, it increases its hardness and strength. This process is called:

A

Aging

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12
Q

Steel is hardened by heating it to a specified temperature and then quenching it in oil, water or brine.

The hardest and most brittle steel is obtained by quenching it in _____.

A

brine

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13
Q

A steel part may be made less brittle by heating it to a temperature quite a way below its critical temperature and allowing it to cool in still air. This procedure is called ___________.

A

Tempering

Tempering - a form of heat treatment in which some of the hardness and brittleness is removed from a metal that has been hardened by heat treatment.

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14
Q

Fill in the code letter that is used to identify each of the following treatments for aluminium alloy:

a. As fabricated with no control over its temper
b. Annealed
c. Solution heat treated
d. Strain hardened

A

a) F
b) O
c) T
d) H

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15
Q

Icebox rivets are aluminium alloy rivets that must be heated and stored in a subfreezing refrigerator until they are driven.

Two alloys of which icebox rivets are made are

_______ and _______

A

2017 and 2024

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16
Q

An aluminium alloy sheet that has a coating of commercially pure aluminium rolled onto its surface is called ______ aluminium.

A

Clad

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17
Q

The aluminium alloy rivet that may be driven as it is received from the manufacturer without having to be heat treated is made of alloy ______.

A

2117

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18
Q

When a steel tubular fuselage is first welded, there are strains trapped in the structure. To relieve these strains, the structure is heated to a temperature above its critical temperature and allowed to cool in still air.

This procedure is called _______.

A

Normalising

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19
Q

If too much time elapses between the removal of a piece of aluminium alloy from the heat treatment oven and the time it is quenched, there is danger of ________ corrosion forming inside the part.

A

intergranular

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20
Q

The most generally used metal for aircraft firewalls is ______

A

Stainless Steel

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21
Q

Most welded steel aircraft structure is made of SAE steel _______

A

4130 - 4XXXX Silicon

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22
Q

Clad aluminium alloy has a coating of ______ rolled onto its surface to improve its corrosion resistance.

A

Pure Aluminium

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23
Q

SAE 1020 steel has a carbon content of _____%

A

0.20

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24
Q

Commercially pure aluminium is identified by the code number _______

A

1100

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25
Identify the series numbers for aluminium alloys that have the following major alloys: a. Copper b. Magnesium c. Zinc
a. 2XXX - Copper b . 5XXX - Magnesium c. 7XXX - Zinc
26
Titanium can be welded by using ______ electric arc welding.
Inert Gas
27
PG 433 Questions 8 - 15 not done as not covered yet wood etc
28
The threads for most aircraft structural bolts have a class-\_\_\_\_\_\_\_\_\_ fit.
3
29
Torque values listed for aircraft bolts normally consider the threads to be clean and \_\_\_\_\_\_ (Dry or lubricated)
Dry
30
The accepted rule of thumb for installing bolts in an aircraft structure is to have the bolt head __________ (up or down), _________ (forward or rearward), and _______ (inboard or outboard)
Up Forward Outboard
31
A fiber-type self locking nut should never be used on a bolt if the fastener is subject to \_\_\_\_\_\_\_\_\_.
Rotation
32
Identify the material of which the bolt is made when its head is marked with a/an: 1. Cross or aserik 2. Single dash 3. Two dashes
1. Nickel Steel 2. Corrosion resistant steel 3. Aluminium Alloy
33
A bolt whose head is identified with an asterik enclosed in a triangle is a ________ bolt.
Close tolerance
34
A steel bolt with no marking on its head is made of _____ steel and ____ approved for use in aircraft structure.
Low strength Is not
35
The length of the unthreaded portion os a bolt shank is called the _____ of a bolt.
Grip Length
36
Clevis bolts are designed to be used for ___ loads only
Shear
37
To be sure that the terminal ends are screwed into a turnbuckle barrel enough to produce the maximum strength, there must be no more than _____ threads showing on either end of the barrel.
3
38
When safetying a turnbuckle, the ends of the safety wire must be wrapped around the terminal end for at least ____ turns.
4
39
Identify the material of which solid rivets are made which have the following head markings: a. Raised dot b. Recessed dot. c. Raised double dash d. Raised cross
a. 2017 b. 2117 c. 2024 d. 5056
40
Give the diameter and length of these solid rivets: a. MS20470AD4-4 b. MS20426DD4-6 c. MS20470D6-8 d. MS20426AD6-10
a. 4/32 '' diameter, 4/16 '' length b. 4/32'' diameter, 6/16'' length c. 6/32'' diameter, 8/16'' length d. 6/32 '' diameter, 10/16 '' length (can simplify fractions and should)
41
Friction-lock self plugging rivets (blind rivets) _______ (are or are not) approved for replacement of solid rivets on a size for size basis.
are not
42
When it is necessary to provide a threaded hole in a piece of thin sheet metal, a _____ may be used
rivnut
43
Hi-Shear pin rivets _____ (may or may not) be used to replace steel aircraft bolts on a size for size basis
may
44
The white powder which forms on the surface of aluminium when it corrodes is a chemical \_\_\_\_\_.
Salt
45
The chief alloying agent in 2024 aluminium alloy is \_\_\_\_\_.
Copper
46
In an alloy of aluminium and copper, the _____ will be eaten away by corrosion.
Aluminium
47
The three basic requirements for the formation of corrosion are: a. b. c.
a, Must have an electrode potential difference within the metal b. must have a conductive path between the areas of potential difference c. must be covered with an electrolyte
48
Three steps that can be taken to minimize damage from corrosion are: a. b. c.
a. minimize potential difference b. eliminate conductive path c. prevent electrolyte contacting the metal
49
Arrange these metals, cadmium, copper, iron, and magnesium in the proper order of their electrochemical activity. Place the most active metals first. a b c d
a. magnesium b. cadmium c. iron d. copper
50
When electrolytic or galvanic corrosion occurs between an aluminium structure and a steel bolt, the ______ will be the metal that is corroded.
Aluminium
51
Corrosion that forms in riveted joints where there is a slight relative movement is called ______ corrosion.
Fretting
52
A green corrosion film forms on \_\_\_\_\_\_.
copper
53
An extreme case of intergranular corrosion that forms in extruded metal in which the metal separates in layers is called ______ corrosion
exfoliation
54
Another name for dry corrosion is
Oxidation or rust
55
Corrosion that forms insde a metal along the grain boundaries is called _____ corrosion.
Intergranular
56
One of the primary causes of intergranular corrosion is \_\_\_\_\_\_\_\_.
Improper heat treatment
57
Exfoliation corrosion usually develops in _____ metal parts
Extruded
58
If an unplated copper bonding braid is attached to an aluminium alloy structure and is not protected, the ____ will corrode.
Aluminium
59
Stress corrosion occurs when a part is under a ______ (tensile or compressive) stress in a corrosive environment.
tensile
60
Fretting corrosion _______ (can or cannot) form if there is no relative motion between the surfaces
cannot
61
The scum that forms inside the fuel tanks of some jet aircraft is caused by _____ and ____ in the fuel.
microbes, bacteria
62
An additive may be used in jet fuel to help prevent corrosion inside the fuel tanks. This additive kills the _____ and \_\_\_\_\_.
microbes, bacteria
63
Polyester fabric is shrunk on an aircraft structure with \_\_\_\_\_.
Heat
64
Resins that are reinforced with glass filaments to make aircraft structural components are ______ resins
Thermosetting
65
Catalysts are used with ______ resins to cause them ti cure.
Polyester
66
Curing agents are used rather than catalysts when mixing _______ resins.
Epoxy
67
Glass cloth that is woven with both warp and fill(weft) threads is called ______ cloth
bidirectional
68
Kevlar is ______ than fiberglass fabric of equal strength (Lighter or heavier)
Lighter
69
The reference wood used for aircraft construction is \_\_\_\_\_
Sitka Spruce

Mod 6: Materials & Hardware (18 decks)

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