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WorksheetsQuiz on Sine Waves and Aircraft Systems
Total questions: 71
Worksheet time: 36mins
The primary effect of a coil is its property to oppose any change in current through it. This property is called
magnetic induction
mutual induction
inductance
Value is always less than the peak value and approximate DC voltage of the same value?
Maximum Value
Instantaneous Value
Effective Value
Alternator master switch operates a circuit within the alternator control unit (or voltage regulator) and
sends current to the alternator field
sends voltage to the voltage regulator
sends field strength to the BUS
Refer to the figure above. What may be used to disconnect the Avionics Bus from the Main Bus during engine starting?
Avionics master switch
Main Bus power control relay
Avionics components are isolated during engine start by the reverse current contact relay.
When will the ammeter give a zero indication when troubleshooting an alternator system?
when the alternator system is inoperative
when the GCU is uninstalled
Much of aviation communication and navigation is accomplished through the use of
AC and DC generated electrical supply
Radio Waves
A rectifier to convert AC to DC electrical power
Why is it important for technicians to be aware of correct orientation of the ADF antenna?
placement of ADF antenna is critical to a correct indication since it is a directional device
the received signal induces voltage that is sent to two stators in a resolver or goniometer
the ADF antenna is omnidirectional and placement has no correlation to operation
Of the three segments of GPS, which segment are Aircraft Technicians only involved with?
User
Space
Control
Why are clamps installed with their attachment hardware positioned above them?
there is no requirement for installation of clamp hardware. Nylock (self locking) nuts are used and maintain the integrity of the clamp mounting.
they are unlikely to rotate as the result of wire bundle weight or wire bundle chafing
this practice has been adopted to reduce the need for aging wire inspections, as it keeps wiring secured
Spare contacts for future wiring are normally provided on connectors. Connectors must have all contact cavities filled with
plugs, or sealing receptacles
sealing compound, with adjacent bonding jumper to avoid ESD
wired or unwired contacts, unwired contacts should be provided with grommet sealing
DC alternators contain two major components
commutator/ field winding
armature/ commutator
armature winding/ field winding
Which manual diagram will typically identify each component within a system by its part number, including any changes that were made?
Schematic Diagram
Wiring Diagram
Block Diagram
What conductors are used to transmit and receive radio frequency waves?
Coaxial Inductors
Antennas
Coaxial
What is done with wires that perform the same function in redundant systems?
the wires must be routed through separate connectors
the wires must be routed on separate sides of the aircraft, and away from EMI/RFI interference
the wires are routed together within the same connector to facilitate ease of operation
The major parts, or assemblies, of a DC generator are
field frame, rotating armature, brush assembly
field frame, rotating armature, commutator
field frame, slip rings, commutator
What device will aid the pilot to intercept the ILS to enable its use?
EFIS
Compass Locator
Radio Magnetic Indicator
How does the Inertial Navigation system (INS)/ Inertial Reference System (IRS) determine the aircraft location?
through calculations based on the forces experienced by INS accelerometers
with updates from the INS/IRS radio transceiver
from the GPS input
Concerning coaxial cable, what protects the inner conductor from an external field?
Dielectric-Insulator
Braided Cover
Central Conductor
When VHF communication transceivers are coupled with VOR receivers, they are called
NAV/COM radios
VOR/VHF transceiver
VHF radios cannot be coupled with VOR receivers, one is for voice and the other is navigation only
Inadequate bonding or grounding can lead to
an increase of capacitive reactance creating "ICE" current leads the applied voltage by 90 degrees
EMI, electrostatic discharge to sensitive electronics, or personnel shock hazard
where full system voltage is present while measuring continuity
The phase shift created by inductive reactance always causes voltage to
remain in phase with current
lag current
lead current
The NAVSTAR satellites for GPS are positioned such that in any place on earth at any one time
at least 5 will be a minimum of 15 degrees above the horizon
Typically, between 5 and 8 satellites are in view
at least 4 will be a minimum of 15 degrees above the horizon
What radio waves bounce off the ionosphere layer of the atmosphere?
HF
UHV
VHF
If a VOR gauge is not used on the aircraft, the VOR information may be displayed where?
GPS, NAV/COM
RMI, HSI, EFIS, or EADI
NAV/COM transceiver and control panel
Commercial and military aircraft use wire that is manufactured under
MIL-W-22759 specifications
MIL-SPEC-22579
MIL-M-22759
What are two ways to protect electrical systems from faults?
circuit breakers and fuses
mechanically and electrically
GCU and BPCU
In the event of Main Generator failure on multiple generator systems, what provides a back up power source?
IDG integrated drive generator
APU Generator
Static Inverter
Many weather radar radomes also contain grounding strips, and are used to
to conduct lightning strikes and static away from the dome
all signals to pass unobstructed by refracting the signal in a direct manner
provide a bonding point for the rotating antenna assembly during operation to maintain a less than 50 ohm manufactures requirement
Which antenna type is highly direction-sensitive?
Loop Antenna
Dipole Antenna
Marconi Antenna
Radio waves are directional and propagate into space at 186,000 miles per second, what determines the distance they travel?
Current and type of antenna
Frequency and the amplification of the signal sent to the antenna
The type of radio wave
Which manual diagram consists of individual blocks that represent several components, and is used for troubleshooting complex electrical and electronic systems?
Schematic Diagram
Pictorial Diagram
Block Diagram
Above, what BUS is directly connected to the battery?
hot battery bus
Main AC bus
emergency AC bus
What radio waves are only capable of line-of-sight transmission and do not refract off the ionosphere?
VHF, UHF, SHF
HF
VLF, LF, MF
Two satellites the COSPAS-SARSAT system used to recieve an ELT signal in orbit
LEOSAT/GEOSAT
ELTSAT/GEOSAT
ELTSAT/EMGSAT
Title 14 of the Code of Federal Regulations (CFR) part 91, states that all transponders on aircraft flown in controlled airspace are required to be inspected and tested every _________.
90 days
6 calendar months
24 calendar months
Concerning cockpit digital displays, PFD, and ND refers to
Pilot Flying Display/ Navigational Display
Pilots Flight Display/ Normal Display
Primary Flight Display/ Navigational Display
ADSB has several advantages over conventional ground-based radar, which is NOT a factor
The entire airspace can be covered with a much lower expense
UHF GPS transmissions are affected by weather, and therefore weather delays are increasing
Increased positioning accuracy allowing for higher density traffic flow
What are the two fundamental properties of insulation materials?
insulation resistance, dielectric strength
heat resistance, area of conductor
current strength of conductor, and ability to withstand harsh environmental conditions
The purpose of the Squat Switch in a landing gear circuit is used to determine
if the aircraft is on the ground or in flight
the wheel speed transducer has enabled the anti-skid system
the MTOW of the aircraft
What causes Thermal Runaway in a NiCd Battery?
Thermal runaway has been eliminated with VRLA Batteries
Low temperature condition, and cell imbalance
A combination of high battery temperature and overcharging
What ELT frequency is no longer received and relayed via satellite?
121.5 MHz
230.0 MHz
406 MHz
The rotation of generators is termed either clockwise or counterclockwise, as viewed from
either end of unit and stated on manufacturer's data plate
the drive direction has no effect on generator output
the driven end
Two ways to charge batteries are
Constant Voltage/Constant Current
Constant Voltage/Constant Potential
Constant Current/Constant Polarity
What aids in the identification of the performance capabilities of existing wiring to avoid using a lower performance or unsuitable replacement wire?
The AWG chart
Part number followed by a five digit/letter CAGE code
MIL-W-0036 Wire List in MFG manuals
Automatic direction finders (ADF) use radio waves at frequencies ranging from 3kHz to 3mHz and are known as
VHF very high frequency radio waves
(HF) High frequency radio waves
ground or surface waves
What unit is found in almost all voltage regulation circuitry of a GCU?
carbon pile regulator
zener diode
power rectifier diode
There are three factors that can create an opposition to the flow of electrons in an AC circuit.
resistance, inductive reactance, and capacitive reactance
number of turns, cross-sectional area of coil, length of a coil, and core material around which the coil is formed
number of coils, speed of rotation, strength of magnetic field
Modern navigation avionics have enhanced interface with the pilot, the term “glass cockpit” refers to
analog indicators
a fully visual and well lit navigation system
a digital data display system
Bonding is defined as
the electrical connecting of two or more conducting objects not otherwise adequately connected
when using B12 1/2 to secure antenna mounts properly to the fuselage and eliminate water intrusion
providing an unintentional low resistance path to ground
When substitution of a wire is required
it is permissible to increase wire size 10% of existing wire. This is due to the dielectric breakdown of aging aircraft wiring
prior to replacing the wiring, the maintenance manual must be reviewed if the Original Manufacture has approved any substitution
wiring replacement is a generally accepted method for repair, or to remove aged or cracked wiring in SWAMP conditions
Area Navigation is a term used to describe the nav. from point A to B by use of phantom waypoints...etc
FMS
CDI
RNAV
Glidescope radio signal point on the runway at angle of
6 degrees
4 degrees
2 degrees
3 degrees
How are avionic equipment and racks kept cool
routing atmospheric air
routing compressor bleed air
routing air-conditioned air
Antenna half the wavelength of the corresponding AC frequency
exact shape and material has no effect
allow full voltage and current flow in both positive and negative phase of the AC signal
allow full voltage and current flow in the positive phase and ground out the negative phase of the AC signal
General practice, wire smaller than #20
are not allowed on aircraft
used due to their weight saving ability
should be provided with additional clamps and be grouped with at least 3 other wires
What only way determined NiCd state of charge
by measured discharged with a NiCd battery charger following the Man. Instr.
with constant current method, fully charging battery
with a hydrometer to a specific gravity of 1.275-1.301
What switch activate 2 seperate circuits at the same time
SPDT
DPDT
DPST
Most common examples of twisting wires
radio wires, near magnetic compass
long distance runs
wires should never be twisted
Full wave rectifier
Pulse Rect.
Beam Rect.
Bridge Rect.
Stator Rect.
Istrument landing system provides vertical reference/guidance
Radial Altimeter
DME
Localizer
Glideslope
Greek letter lambda?
Wavelength
Frequency
Period
Used on most performance turbine powered A/C
A/C electrical systems
D/C power systems
Generated Power systems
SYS installed on A/C for collision aviodance
EVASIVE ACTION TRANSPODER
FLIR
TCAS
NAVSTAR sat. for GPS are positioned such that in any place on earth at any one time
5 will be a mininum of 15 degrees above the horizon
between 5 and 8 satellites are in view
at least 4 will be a minimum of 15 degrees above the horizon
Allows DC generator to produce DC output?
commutator action
full wave rectifier
slip rings
Antenna highly direction-sensitive
Dipole
marconi
loop
Spring-loaded, momentary contact switch is callled
Relay
Limit switch
Lighted Pushbutton Switch
ELT frequency is no longer received and relayed via satellite?
408
121.5
250.7
Frequency is monitored by over-flying aircraft and control towers
121.5 MHz
233.MHz
745.01 MHz
678.89 MHz
Provides vertical guidance
Localizer
Radial Altimeter
Radio Altimeter
Glideslope
PFD and ND refer to
Primary Flight Display/ Navigational Display
Pilot Flying Display/ Nautical Display
Pilot Flight Display/ Normal Display
