問題一覧
1
is a simple structure built-up from layers of cloth impregnated with resin
A laminate
2
Phenolics are fairly brittle system but they have
good fire/smoke toxicity performance
3
Ceramic fibres are used in heat resistant blankets and to weave fireproof cloth for engine and pylon protection
high temperature application is required ,e.g. a firewall
4
Most aircraft control system pulleys are made from
Tufnol
5
proposed repair scheme should meet all the original design requirements
the structure
6
Adhesive joints are liable to experience main types of stress
Tensile ▪ Shear ▪ Cleavage and ▪ Peel
7
Fatigue tests can be carried out
either on individual components or on complete aircraft structure
8
On a wooden aircraft structure if there is no evidence of fiber adhesion in the glue in a failed glued joint
this may indicate glue deterioration
9
Epoxy resins
are the most widely used resin types for aerospace adhesive and composite applications
10
wood shrinkage occurs greatest in the
tangential direction to the growth ring
11
Strength
is the name of the ability to support load without breaking
12
The brinell hardness testers uses a
steel ball indenter
13
The Charpy and Izod tests are types of
impact tests
14
For aluminum alloy, the maximum time between removal from heat treatment furnace and quenching must be not more than
7 Seconds
15
The carbon content in medium carbon steel is
0.3-0.8 %
16
Duralumin
2000 series of aluminum alloy
17
At normal temperature High Carbon Steel is harder because
of the percentage of carbon in the granules
18
A salt bath is a heated tank containing mineral salts, typically
90% nitrate and 10% sodium nitrate
19
Non-heat treatable aluminum alloys can be hardened by
strain hardening
20
Plasticity is
the opposite to elasticity
21
Toughness is the opposite of
brittleness
22
In aircraft engineering terms, a composite usually consists of
plastic resin matrix and reinforcing fibres of various materials
23
The standard wood type for aircraft wood structures is
Spruce
24
are made from pure carbon and are black in colour
Carbon fibres
25
A disadvantages of Thermoplastics
lack rigidity not commonly used for aeronautical composite resins
26
An Impact Test measures
toughness
27
Cyanate esters
the material’s has dielectric properties for manufacturing high speed radomes
28
the aluminum will have a
lower VPN Vickers pyramid hardness than the steel
29
The name given to the longitudinal direction of the fiber in woven fabric is
warp
30
A fibre made
of glass
31
Carbon fibre composites are known of these general characteristics
High tensile strength and High compressive strength
32
Normalizing heat treating
Iron- base metals
33
A visible wrinkle found across the face of piece of wood , in a wooden structural member , is most likely
a compression shake caused by compression load
34
Iron oxide is sometimes added to aircraft dope to improve it's
durability to adhesion
35
do not resist flame well and burn through more quickly than other fibres
Aramid fibres
36
Refrigeration of heat-treated aluminum alloys is sometimes done in order to
delay the precipitation process
37
The identification No. of zinc in aluminum alloy is
7
38
Ring shake defect of wood is indicated by a parting of the
annular rings
39
Clad aluminum alloy (alclad
5% of alloy thickness
40
The 6000 series of aluminum alloy principle alloying element of
magnesium and silicon
41
is the ability to resist off-set (scissor action) load
Shear strength
42
The melting point of titanium is
1668˚C
43
Cementite is
Strong but hard and brittle
44
Quenching is required to be done in hot or boiling water
to reduce quenching stress
45
Thermal conductivity
ability of a material to conduct a certain amount of heat within a given time, copper is a good example is
46
Aluminium Solution heat treating is
the process of heating aluminium at prescribed temperature for a prescribed time and then cooling rapidly usually by quenching in water
47
Impact resistance
the ability of a material to withstand impact without shattering
48
The best type of wood to be used in the construction of aircraft is
Sitka Spruce
49
Polyesters are two or three-part systems have good environmental resistance and heat resistance up
to150˚C
50
Steel annealing process it
relieves internal stress suffered After engineering processes
51
is high resistance to corrosive materials. It is normally produced and used only as a surface matt to reduce cost
C’ Glass
52
The two classes of aluminum alloy is done to
Wrought (worked) and Cast (moulded)
53
Stiffness
the ability of a material to support a load without bending too much
54
Precipitation heat treatment of aluminum alloy is done to
speed up age hardening process
55
Curved wooden parts are made by
soaking or steaming wood strips then clamping in a jig to set the bend
56
the fibres in composite can be wound tightly to increase
strength
57
The ‘Nimonic’ series of alloys are
high temperature, corrosion resistance
58
Fabric repair seams on a fabric covered aeroplane should be
covered with tape
59
Specific repair instruction and limitations of damage of composite are provided in
Structural Repair Manual
60
Adding other elements to aluminum alloys, such as copper, manganese or magnesium
decrease corrosion resistance of the aluminum
61
Fish – eyes are small areas which have not dried uniformly due
surface • contamination with oil, wax or silicone products
62
is the only inspection method for identifying excess tension in aircraft fabric covering
Observation
63
Grinding of a steel reveals a
dull but spark pattern (lots of forking). It is likely to be high carbon steel
64
The composite structural defect of separation of composite panel plies is called
delamination
65
is an improved electrical grade of glass for modern radome
D’ Glass
66
a resin characteristics
Have ambient temperature storage
67
Lap seam is the only seam type in a fabric covering requires that the selvedge be left on ,or the fabric edge cut with
pinking shears
68
Polyester fabric, used on a fabric covered airplane may be attached to the structure by
strings or by use of fabric adhesives
69
Plastics are made from materials obtained from
animal or vegetable products and coal or petroleum by-products
70
Epoxy resins advantage that they
do not react with the solvents and dopes used for fabric coverings
71
When selecting wood suitable for aircraft structural use, the growth
rate should be more than 6 rings per inch (25 mm)
72
Metals which contain
iron is ferrous metals
73
standard soda glass in common use for windows , etc
A’ Glass
74
Retarder is used to slow the drying time of dope finishes to prevent
blush
75
the effects of annealing steel
decrease in internal stress and softening of the metal
76
Primary aircraft structure (skin and spars etc.)
made of C-110M • titanium
77
The composite part must be as strong and durable as
the original
78
Excessive tension in aircraft fabric is
usually caused by excessive dope film on new covering
79
Nitriding of steel by
ammonia gas
80
• A steel with 1.3 % carbon content is
high carbon steel
81
a material to fracture when subjected to a shock loading or blow : a
brittleness
82
Pearlite is a laminate microstructure of steel consisting of
ferrite and cementite
83
In (5052-H24) the letter H indicates
Strain hardening
84
The purpose of rivets Refrigeration
to make rivets the soft formable condition
85
Common method of
non-destructive
86
Following solution treatment aluminum alloy can be placed into service
after 5 days
87
The mechanical properties of pure aluminium are
silvery white metal which is soft and ductile
88
The Bayer process to convert
bauxite to alumina
89
The heat treatment of clad aluminum alloys must not be carried out more than
three (3) times
90
The usual method of repairing elongated bolts in a wooden structure is done by
fitting steel bushes
91
Lacing cord or stringing chord used on aircraft fabric covering must have a minimum breaking strength of
60 Ib
92
Case hardening is
heat-treating process of metal produces a hard, wear-resistant surface over a strong, tough core
93
thermosetting resin
once cured, it cannot be become liquid again by heating