問題一覧
1
A single mode fibre operates best with what type of light source
Laser
2
Fibre optic cable consists of
a silica glass core with a cladding having a lower refractive index
3
The angle between the reflected wave and the normal is called
the angle of reflection
4
The core size which is typically around 8 to 10 micrometers is related to
Multimode Fibres
5
The refractive index of a core that is uniform and undergoes and abrupt change at the core- cladding boundary is what type of fiber
Step index fiber
6
The Ribbon cables design has
the highest fiber capacity, it can hold 204 fibers in a 0.5 inch cable
7
A typical fiber optic connector is
coupling type with lens fitted
8
The refractive index of the core varies gradually as a function of radial distance from the fibre centre this is
graded - index fibre
9
What kind of light is used in fibre optic systems
Infrared
10
The code for red colour in RGB colour production is
100
11
Unlike the black and white CRT the colour CRT has
three electron guns each dedicated to one of the primary colours, red, green, or blue
12
The white colour production from the three primary colours represented by
-111
13
If the magnetic field is parallel to the Y plate the direction of beam movement will be
vertical axis
14
Touching connector pins or other exposed conductors could cause
damage to component may result
15
The resistance of the wrist strap used as part of uni-static precaution should be
250 kilohm- 1.5 megohms
16
The devices Ability to dissipate the energy of discharge or withstand current levels involved is known as
device ESD sensitivity. Or ESD susceptibility
17
Before removing an assembly from an aircraft, with regards to HIRF, you must first ensure that
there is minimum current flow between you and the assembly
18
When handling PCBs labeled ESDS the precaution are taken
isolate electrical power before installing on aircraft
19
Before removing a card, electrical power sources should be
isolated
20
Software can be modified by
using the same rules as to modifications to hardware
21
Level A
Catastrophic failure
22
F
ailure conditions which prevent continued safe flight and landing
23
Failure may cause crash error or loss of critical function required to safety fly and land aircraft is
Catastrophic
24
What is the effect of a level 1 software failure
Loss of aircraft and /or fatalities
25
An aircraft system allocated a Criticality Category of Hazardous has software level of
B
26
Suppose failure in level E software this will cause
no effect
27
Modification to software will be subjected to the same approval procedures as are applied to
hardware modifications
28
Collection of data where the computer gets specific information is
Databases
29
What is the Software Media
Device that contains a copy of the software
30
All passenger seats are addressable means
by the computer which transmit data through the network directly to individual passenger seat
31
Failure system in the aircraft according to software error cause a significant reduction is safety margin which cause
injures to occupants
32
Which Document provides guidance to aircraft constructors of software
DO-178B/ED
33
Which section will summarize the plan and test result:
software Verification plan
34
Ground loops are prevented by
ground only one end of the
35
When incorporating an aerial cable it must be
positioned separately from the loom
36
The avionics bay in the larger aircraft are placed in
below the floor
37
Electromagnetic compatibility is achieved by
Shielding, screening, earthling, bonding and interference filters
38
In order to maintain HIRF protection, bonding checks between airframe and electrical components carrying voltages greater than 50 volts RMS or DC or main earth return should not exceed
0.05 ohm
39
Primary flight display (PFD) and navigation display (ND) are two main display units that together
make up the EFIS for commercial aircraft
40
To reduce HIRF on radio equipment
ensure all static wicks are in place
41
HIRF protection of LRUs is provided by
built in filters and overvoltage circuits
42
The phase shift between the electric field oscillation and magnetic field oscillation is
90⁰
43
When carrying out a bonding check on a surface protected by anodic film
The anodic film should be removed locally to ensure a good contact
44
When clamping cable looms containing co-axial cables
avoid distortion to it, to maintain the dielectric constant.avoid distortion to it, to maintain the dielectric constant
45
Testing of HIRF on aircraft system is done
at and during production and testing (initial certification
46
In airbus core on board information system (OIS) a servicing tool used for the refueling operation is a part of
avionics domain
47
All the information necessary for maintenance and trouble shooting is memorized in
Non Volatile Memory
48
Laser gyros, accelerometer and power supply output, computer and memory operation , and temperature parameters continually monitored by
built-in test equipment (BITE)
49
Aircraft communication addressing and reporting systems is used to
download aircraft status reports
50
The ACARS is used to
transmit or receive automatically or manually generated reports or messages to or from a ground station
51
The cabin crew can get access to the cabin applications via
flight attendant panel or internal wireless data link
52
The global positioning system (GPS) use the same principle as
DME
53
Fly-By-Wire system Flight control surfaces are all
Electrically-controlled, Hydraulically-activatedElectrically-controlled, Hydraulically-activated
54
Rudder control
yaw
55
Rudder control
yaw
56
The function of ring laser gyro is to measure
angular rotation
57
In fly by wire how many flight control computer are there
seven computers
58
In fly by wire the maximum deflection of aileron is
25degree
59
Memory that retains data when power is removed is
non-volatile memory
60
A computer which is used as a primary source of information or data is called
reference computer
61
The colour that produced by DU which used during inflight engine starting and cross bleed message is
Magenta
62
According to GPS providing correct timing each satellite carries
a very accurate atomic clock
63
The American Global Positioning System (GPS), also called NAVSTAR
uses 24 satellites, with three or more spares, in orbit at any one time
64
The system which calculates a vertical profile that giver the shortest possible flying time at the lowest fuel consumption is
FMS
65
The color used for middle marker is
amber
66
How many accelerometers are there in the INS system
two accelerometers
67
What are interrogator transmitter and receiver frequencies
1030 MHz and 1090 MHz
68
In TCAS IF the monitoring system detects a problem
it switching off the interrogator warns the crew and sends mode S message to ground interrogation
69
In TCAS II the voice command – climb, crossing climb-means
Climb at 1500 ft./min through the intruders altitude
70
Fibre Optic basic functions
To convert an electrical input signal to an optical signal ,To send the optical signal over an optical fibre ,To convert the optical signal back to an electrical signal
71
The function of ring laser gyro is to measure
angular rotation