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Mod 6: Materials & Hardware > Book Questions > Flashcards

Book Questions Flashcards

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
Q

Identify the series numbers for aluminium alloys that have the following major alloys:

a. Copper
b. Magnesium
c. Zinc

A

a. 2XXX - Copper

b . 5XXX - Magnesium

c. 7XXX - Zinc

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26
Q

Titanium can be welded by using ______ electric arc welding.

A

Inert Gas

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27
Q

PG 433 Questions 8 - 15 not done as not covered yet wood etc

A
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28
Q

The threads for most aircraft structural bolts have a class-_________ fit.

A

3

29
Q

Torque values listed for aircraft bolts normally consider the threads to be clean and ______

(Dry or lubricated)

A

Dry

30
Q

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)

A

Up

Forward

Outboard

31
Q

A fiber-type self locking nut should never be used on a bolt if the fastener is subject to _________.

A

Rotation

32
Q

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
A
  1. Nickel Steel
  2. Corrosion resistant steel
  3. Aluminium Alloy
33
Q

A bolt whose head is identified with an asterik enclosed in a triangle is a ________ bolt.

A

Close tolerance

34
Q

A steel bolt with no marking on its head is made of _____ steel and ____ approved for use in aircraft structure.

A

Low strength

Is not

35
Q

The length of the unthreaded portion os a bolt shank is called the _____ of a bolt.

A

Grip Length

36
Q

Clevis bolts are designed to be used for ___ loads only

A

Shear

37
Q

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.

A

3

38
Q

When safetying a turnbuckle, the ends of the safety wire must be wrapped around the terminal end for at least ____ turns.

A

4

39
Q

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

a. 2017
b. 2117
c. 2024
d. 5056

40
Q

Give the diameter and length of these solid rivets:

a. MS20470AD4-4
b. MS20426DD4-6
c. MS20470D6-8
d. MS20426AD6-10

A

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
Q

Friction-lock self plugging rivets (blind rivets) _______ (are or are not) approved for replacement of solid rivets on a size for size basis.

A

are not

42
Q

When it is necessary to provide a threaded hole in a piece of thin sheet metal, a _____ may be used

A

rivnut

43
Q

Hi-Shear pin rivets _____ (may or may not) be used to replace steel aircraft bolts on a size for size basis

A

may

44
Q

The white powder which forms on the surface of aluminium when it corrodes is a chemical _____.

A

Salt

45
Q

The chief alloying agent in 2024 aluminium alloy is _____.

A

Copper

46
Q

In an alloy of aluminium and copper, the _____ will be eaten away by corrosion.

A

Aluminium

47
Q

The three basic requirements for the formation of corrosion are:

a.

b.

c.

A

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
Q

Three steps that can be taken to minimize damage from corrosion are:

a.

b.

c.

A

a. minimize potential difference
b. eliminate conductive path
c. prevent electrolyte contacting the metal

49
Q

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

a. magnesium
b. cadmium
c. iron
d. copper

50
Q

When electrolytic or galvanic corrosion occurs between an aluminium structure and a steel bolt, the ______ will be the metal that is corroded.

A

Aluminium

51
Q

Corrosion that forms in riveted joints where there is a slight relative movement is called ______ corrosion.

A

Fretting

52
Q

A green corrosion film forms on ______.

A

copper

53
Q

An extreme case of intergranular corrosion that forms in extruded metal in which the metal separates in layers is called ______ corrosion

A

exfoliation

54
Q

Another name for dry corrosion is

A

Oxidation or rust

55
Q

Corrosion that forms insde a metal along the grain boundaries is called _____ corrosion.

A

Intergranular

56
Q

One of the primary causes of intergranular corrosion is ________.

A

Improper heat treatment

57
Q

Exfoliation corrosion usually develops in _____ metal parts

A

Extruded

58
Q

If an unplated copper bonding braid is attached to an aluminium alloy structure and is not protected, the ____ will corrode.

A

Aluminium

59
Q

Stress corrosion occurs when a part is under a ______ (tensile or compressive) stress in a corrosive environment.

A

tensile

60
Q

Fretting corrosion _______ (can or cannot) form if there is no relative motion between the surfaces

A

cannot

61
Q

The scum that forms inside the fuel tanks of some jet aircraft is caused by _____ and ____ in the fuel.

A

microbes, bacteria

62
Q

An additive may be used in jet fuel to help prevent corrosion inside the fuel tanks. This additive kills the _____ and _____.

A

microbes, bacteria

63
Q

Polyester fabric is shrunk on an aircraft structure with _____.

A

Heat

64
Q

Resins that are reinforced with glass filaments to make aircraft structural components are ______ resins

A

Thermosetting

65
Q

Catalysts are used with ______ resins to cause them ti cure.

A

Polyester

66
Q

Curing agents are used rather than catalysts when mixing _______ resins.

A

Epoxy

67
Q

Glass cloth that is woven with both warp and fill(weft) threads is called ______ cloth

A

bidirectional

68
Q

Kevlar is ______ than fiberglass fabric of equal strength

(Lighter or heavier)

A

Lighter

69
Q

The reference wood used for aircraft construction is _____

A

Sitka Spruce

Mod 6: Materials & Hardware (18 decks)

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