問題一覧
1
Tensile Testing (Inch) is?
Expressed in terms of pounds per square inch.
2
Impact tests?
Measures toughness of metal or ability to withstand sudden shock or impact.
3
What is the most important advantage of composite structures?
Reduced weight.
4
Hot water quenching of aluminum alloys
Minimize possibility of distortion comparing it to cold water quenching.
5
Which property of metalic materials is toughness?
That material permits to be deformed.
6
The core material of Alcad 2024-T4 is
Heat treated aluminium alloy, and the surface material is commercially pure aluminum.
7
In aviation desirable wire size is
Bigger than size 20.
8
Bowden cable is:
A control cable which has bowden around the cable.
9
Rib bracing tape is used on wing ribs ?
Before the fabric is installed
10
Final product of corrosion process?
Metallic oxides
11
Prepreg fabric - what does it mean?
Partially cured impregnated (with resin) reinforced fabric.
12
Which are the main parts of AN fluid line fitting assembly?
Flare, made on the tube, AN sleeve, nut and AN fitting
13
When choosing conduit its diameter shall be
25% bigger than bundle diameter
14
Pitch of the chain
Is difference between two neighbour-roller Axis.
15
Non-ferrous metals are:
All metals which have elements other than iron as their base or principal constituent.
16
If during Rockwell testing the material is softer than C-20
B-scale is used.
17
Open assembly time is ?
The period from the moment that the structure parts are placed together until clamping pressure is applied.
18
Pinion gear is the expression
For smaller of two mating gears.
19
In Rockwell testing measurement material
With hardness C-70 is harder than material with hardness C-20.
20
What does letter »S« on a bolt head mean?
It means the the bolt was made for a particular application (special bolt).
21
Heating Magnesium alloy in salt bath
May result in explosion.
22
What does Warp indicate in fabric?
Warp indicates the direction of the highest strength in fabrics
23
When use steel bolt in aluminium structure
Use aluminium washers under the bolt head and the nut.
24
Steel music wire is:
Used for lower strength springs.
25
When crimping it is essential that crimp depth is appropiate for each wire size, if:
The crimp is to deep it may break or cut individual strand.
26
Measuring depth of penetration made by a penetrator under known load is used for ?
Hardness testing.
27
A bolt with a triangle on the head:
NAS close tolerance bolt.
28
Wires of two systems that are redundant to each other
Must run through different connector
29
Generally speaking, bolt grip lengths should be
Equal to the thickness of the material which is fastened together, plus approximately one diameter.
30
Which are the most important disadvanteges of control cables?
Cable extends with the time, sensitive to temperature changes wear after longer operation, carries only pull loads.
31
Titanium is often round in
Engine gear box
32
Which statement is true?
Epoxy resin is 1 000 000 times more electrically resistive than aluminium.
33
The aluminum code number 1100 identifies what type of aluminum?
99 percent commmercially pure aluminum
34
To prevent copper wire oxidation it is many times
Tin plated
35
Pure aluminium 1100 has
High corrosion resistance.
36
Laminated wood is
Assembled product of wood and glue where grains of each wood ply are placed in parallel to adjacent ply.
37
If aluminum alloy after cold working is to hard we can soften it by
Annealing.
38
Which is the major disadvantage of swaged fitting assembly?
Not possible to disassemble without destruction
39
"Shop head" on the rivet is the one which is made
By hammer or pneumatic tool
40
Medium pressure hose
Smaller size can carry up to 3000 psi and larger size up to 1500 psi pressure.
41
Bowden cable is suitable for
Transmission of low-force linear movements between two remote locations
42
Tab test method is not reliable for structures with more than
4 plies
43
The matrix in composite structure is:
The bonding material which is outer layer of composite material.
44
When a fabric-covered aircraft is certified, the aircraft manufacturer uses materials and techniques to cover the aircraft that?
Are approved under the type certificate issued for that aircraft. The same materials and techniques must be used by maintenance personnel when replacing the aircraft fabric.
45
With hardness testing we measure:
Resistance to penetration into measured material.
46
Coaxial cables repairs
Can not be repaired at all.
47
The Maule punch tester, a spring-loaded device with its scale calibrated in breaking strength?
Tests fabric strength by pressing against it while the fabric is still on the aircraft.
48
Shakeproof lock washers
Can be used only once.
49
Leaf springs are:
Made of layers of flat springs.
50
Why is steel tempered after being hardened?
To relive its internal stresses and reduce its brittelness.
51
Rockwell Hardness Tester:
Both answers above are correc
52
Polarization key on the connector is used for:
To prevent wrong insertion.
53
Stress releaving process - for non-ferrous material
Is used for Titanium
54
One of copper and copper alloys good characteristics is
High electrical and heat conductivity
55
Bulkhead groove for transmission of the cable through bulkhead -shall be
of softer material than the cable
56
Which are the most important advantages of control cables
High loadable, needs only limited space, operates with no play, high flexibility.
57
Which or the following are all hardness testing machines?
Rockwell and Brinell
58
The most common electrolyte as one of basic elements for start of corrosion is?
Water
59
Anti-chafe tape is used on?
Sharp protrusions, rib caps, metal seams, and other areas to provide a smoother surface to keep the fabric from being torn
60
Bend radii of the normally supported bundle of wires shall not be:
Less the 10 times of diameter of the largest wire in the bundle.
61
Idler gear is the gear:
Between two other gears in order to keep their direction the same.
62
Over expanded honeycomb can be bent in which direction?
Perpendicular to the ribbon direction
63
Cold-rolled coil springs are usually made of:
Carbon or manganese alloys.
64
What is understood under Advanced Composite Materials?
Fibrous material embedded into resin matrix.
65
Two part sealant is
Sealant made from two compounds (base and accelerator) mixed just before its use.
66
Fabric sealer surrounds the fibers in the fabric whith a protective coating to provide
adhesion and keep out dirt and moisture. the sealer is the first coat applie to the polyester fabric after it is attached eothe airframe and heat shrunk to fit snugly
67
A bolt with a single raised dash is classified as an
AN corrosion resistant steel bolt.
68
The best properties of high carbon steel parts is achieved by
Forging with heat treatment.
69
Wires and bundles shall be supported by clamps
Not more than every 24 inch
70
Coaxial cables need special attention
Because they can be easily damaged.
71
Taper lock fastener
Is designed to completely fill the hole of the joint and carries very high loads
72
Which are the properties of ferrous materials?
Having iron as a main constituent.
73
Which material can not be heat treated repeatedly without harmful effects?
Thermoplastic materials.
74
Thermography reliably detects defects in
Thin materials and defects near surface.
75
Thin oxide film on copper wire:
Is poor electricity conductor.
76
Fretting corrosion is most likely to occur:
When two surfaces fit tightly together but can move relative to one another.
77
For aluminum alloys the time between soaking and quenching is
Very important
78
What is generally used in the construction of aircraft engine firewalls?
Titanium alloy.
79
AN fittings are colored:
Steel fittings are black and aluminium fittings are blue.
80
Honeycomb core (Nomex) are made of:
Graphite fiber fabric (without impregnative)
81
Rockwell Hardness Tester ?
Indicates hardness value by measuring depth that penetrator advances into metal under known pressure.
82
During Nitriding process
Nitrogen reacts with iron and creates nitrids.
83
Normalising is the process when
Material is released of internal stresses
84
A relay is
An electro-magnetic operated switch and are usually installed in junction boxes
85
Wet layups in composite repairs stands for
A dry fabric is impregnated with a resin just before work starts.
86
Fretting corrosion can be minimized by
Applying anti-fretting resistant material or lubricants between two surfaces.
87
Connectors must be safety - Wired
In areas of high vibrations
88
Are fittings to be installed on tubes going through the bulkhead any different?
Yes, the head of a fitting which goes through the bulkhead is longer than usual.
89
Flexible hoses equipped with swaged fittings
Are ordered by correct length and tested at manufacture and can not be shortened by mechanic
90
A bolt with a triangle on the head is classified as an
AN corrosion resistant steel bolt
91
Which is the fastest quenching media?
Water
92
Nickel alloys are used for springs which
Operate on higher temperatures.
93
WHICH TYPE OF THE RIVET HAS TO BE HEAT TREATED BEFORE APPLICATION?
DD RIVETS
94
Alclad is a metal consisting of
Pure aluminum surface layers on an aluminum alloy core
95
Which side of the connector have sockets installed?
Receptacle.
96
What means cable designations 3/8, 7x19:
This is a steel cable of outer diameter 3/8 in with 7 strands of 19 wires.
97
Which aluminum alloys are most widely used in aircraft construction:
Wrought aluminum alloys.
98
Cure time of two compound sealant depends on
Temperature and humidity.
99
Preformed flexible house
May never be fully straightened
100
What property of titanium alloy makes it very good for welding?
Around 5% of Aluminium and 2.5% of tin