問題一覧
1
Compared to other types of electrical connectors crimping does not have the advantage of
assembly without tools
2
Needle bearings resist
radial load only
3
In general, the cages for bearings can be classified as
pressed, solid or pin-type cages
4
is an acceptable safety device for a turnbuckle to be locked when installed on aircraft cable.
Spring clip
5
Pulleys are usually manufactured from
resin impregnated fibre materials
6
are the transmission forms that are typically used on aircraft.
Belt and pulley drives, Screw jacks and Chains
7
The temperature rating of an airframe cable is determined by
its construction
8
another name for Pneumatic springs is
gas dampeners
9
The removable half which mates with the receptacle and is usually
at the end of a cable/lead
10
Linear expansion of a rotating shaft in housing can be compensated for by using
roller bearings
11
Cables have a specified maximum continuous operating temperature and for many types in general, it is undesirable to contribute more
than 40⁰C rise by electrical heating and that operating temperature and installed life are directly related
12
are necessary in a main rotor gearbox of helicopter.
Conformal gears
13
are the most common and cheapest type of gears
Spur gears
14
A single angular contact bearing can take
radial loads and axial loads in one direction only
15
There are commonly four types of cable strippers available which are:
A rotary device which cuts around the cable ❖ A four-action device, which is a high precision cut and strip tool
16
is the permanent distortion which occurs when a spring is stressed beyond of the elastic limit of the material
set
17
the purpose of bell cranks is
to make angle changes between push-pull rods and to gain mechanical advantages
18
are toothed wheels used to transmit power between components of a machine where the centre distances between the shafts is limited.
Chains
19
is a type of bearings have two rows of spherical rollers with a common spherical path on the outer ring
Toroidal (crowned) roller bearings
20
Springs are mainly made from
carbon spring steel, Inconel or stainless steel
21
An interconnect cable has what insulation
Thinner than airframe cable
22
Control cables of American and European manufacture are classified by their
nominal diameter
23
What type of insulation cannot be stripped with thermal strippers
PTFE
24
Tin plated copper maximum continuous temperature
135ºC
25
Brass springs has good electrical conductivity
but is unsuitable for high-stress applications.
26
Many bearings are prone to experiencing both
radial and thrust loads
27
Aluminium cable where large amounts of current must be carried for
long distances
28
If both the drive gear and driven gear have the identical number of teeth
no mechanical advantage is gained
29
The purpose of keyways on a connector to
allow only plug and receptacle of the same orientation to be connected together
30
The vast majority of aircraft control cables are terminated with swaged terminals , that must be checked with
go-no-go gauge before and after
31
Spring index is
the ratio of mean coil diameter to wire diameter C= D/d
32
Mechanical protection can be provided for the cable by routing the bundles through either
flexible or rigid conduit
33
is used on many Cessna aircraft landing gear.
Leaf spring
34
Light – and medium-sized aircraft .
Bungee cords may be encountered on many
35
The main reason for a slipping belt of pulley is
too much pre-tensioning
36
is a type of gear would be used on propeller reduction gearbox
Epicycle
37
metallic springs may require corrosion protection. Protective coatings may be of
plastic, zinc, nickel, chromium or tin
38
Cable fairleads should usually
never be lubricated
39
Worm drives operated in shafts which are
non-parallel and non-intersecting
40
Co‑axial cable is used as a transmission line for
radio frequency (RF) signals
41
Bevel gears are used to transmit power between
shafts in the same axis
42
What cable would you use where temperatures are going to exceed 200 degrees C
Nickel plated
43
Control cable are protected from riding off the pulley by
Guards
44
The larger diameter on a bevel gear is called
heel
45
Tapered roller bearings consist of
cone shaped inner and a cup shaped outer race and tapered rollers
46
loads on tapered roller bearings are
radial and thrust
47
Needle roller bearings are used
where space saving is an important factor
48
The most commonly used wrapped insulation material is
Kapton
49
What is the purpose of screening on a coaxial cable
To prevent EMF radiating out from the Core cable and prevent induced EMF into the core
50
Custom shaped compression springs include
conical, hourglass or barrel shaped
51
to make changes in direction of a control cable
Pulleys
52
TNC used in
a high vibration area
53
Oxide on exposed silver plated wire is
an insulator
54
The ability of a cable to withstand abrasion is determined by the size and composition of the outer wires and
the construction of the cable
55
coating Kapton insulation with a layer of Teflon is a way of
reducing the risk of arc tracking
56
How are flexible hoses categorized
By maximum pressure
57
On a chain assembly , a change in direction of straight line motion in two planes is achieved by
using bi-planer blocks
58
A small amount of shaft misalignment can be tolerated by using
toroidal roller bearing type
59
A cable tension regulator will be installed in a flying control system to
allow for variations in temperature which will vary the cable tension
60
The TNC (threaded nut coupling) series connector is a threaded version of the BNC and operates to the same specification as
the BNC connector
61
There are a number of factors to consider when choosing the correct cable, these are
Flexibility of the cable
62
The teeth of a gear would normally
case hardened
63
There are two types of Co‑axial connector
TNC and BNC
64
Elasticity is the property of the springs which allows them to absorb energy
by distorting or deflecting under load
65
A crankshaft would be fitted with a
spherical roller bearing
66
Spherical roller bearings
can accept a small amount of misalignment
67
Spring hooks are subjected to
bending load
68
When two gears are running together the larger one is called
a gear
69
Use of crimped splices in
aircraft electrical cables
70
If all instructions issued by the swaging tool manufacturer are followed when swaging a cable terminal, the resultant swaged terminal strength should be
the full rated strength of the cable
71
7x7 control cable has seven strands wire each with
7 wires
72
Interconnect cables employ
thinner insulation than airframe types
73
spherical bearings. consist of an inner and outer race separated by single row of hardened
steel rollers instead of balls
74
is the most important factor that can affect a choice of material for using in springs
The strength of the material
75
Non-reversible chains are similar to standard chains except that each outer plate is extended in
one direction in order to break up the symmetry of the chain to prevent the chain from being assembled incorrectly
76
Aircraft control cable designated as 7x19
consists of 7 strands, each containing 19 wires
77
Pneumatic spring to
dampen out dynamic motion in mechanical systems
78
Nickel clad plated copper maximum continuous temperature
260ºC
79
Most aircraft shock absorber is a
helical compression spring
80
control cable is considered non flexible cable.
1x7
81
The size of the conduit is normally an inside diameter
25% larger than the diameter of the cable bundle being encased
82
When not under load a pair of gears
sits in the middle
83
cable is flexible only in one plane
A bowdenflex
84
A crimped splice is never to be used in
a multi-core cable
85
When two gears are running together the smaller one is called
a pinion
86
A mechanical device used to reduce friction and guide motion of two or more parts which articulate in differing directions.
Bearing
87
If a spring has ‘closed ends’ the first and last coils have
zero pitch
88
Restricted entry for the ring tongue terminals are
identified by a thin coloured band along the barrel insulator
89
After swaging an end fitting onto a flexible control cable with a Nicopress tool, it is it tested for adequate deformation by
using a go/no-go gauge
90
The TNC (threaded nut coupling) series connector is a threaded version of the BNC and operates to the same specification as the
BNC connector
91
Thermal removes the insulation
by melting
92
Material commonly used as the dielectric in Co‑axial cable is
polyethylene
93
An American type Turnbuckle is in safety when
all of the fitting threads are engaged in the barrel
94
Dielectric loss in coaxial cable result from
heating the dielectric material (insulation)
95
The receptacle is normally part of the equipment or
structure and is stationary
96
Aircraft control cable designated as 7x7
consists of 7 strands, each containing 7 wires
97
The TNC series of connectors are used
predominately where vibration is a major factor as they rely on external locking for security