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Total questions: 47
Worksheet time: 26mins
GCU controls the alternator output and function, what controls the distribution of AC power throughout the aircraft?
GGU
RAT
bus power control unit
Although very similar the primary difference between a solenoid and relay is
a relay is controlled with voltage/ a solenoid is controlled with current
a solenoid is voltage controlled/ a relay is current controlled
a solenoid is used for switching high current circuits/ a relay is used to control lower current circuits
What is indicated by the Greek letter lambda?
Wavelength
Period
Frequency
How does the BPCU monitor the complete electrical system?
by controlling the GCU
with remote current sensors known as current transformers
with current limiters, and zener diodes
The major parts, or assemblies, of a DC generator are
field frame, rotating armature, commutator
field frame, slip rings, commutator
field frame, rotating armature, brush assembly
What is the only way to determine the state of charge of a NiCd battery?
by a measured discharge with a NiCd battery charger following the manufacturer's instructions
with constant current method, fully charging battery and verifying the level of electrolyte weight battery after charging
with a hydrometer to a specific gravity of 1.275-1.300
What two line replaceable units are used to control electrical power on large aircraft?
static inverter/transformer rectifier
main alternator/apu alternator
GCU/BPCU
What component in the aircraft will assist ATC with the identification and location during flight?
Emergency Locator Beacon
Radar Beacon Transponder
Marker Beacon
What materials have few “free electrons”?
Semiconductors
Insulators
Conductors
The combined effects of resistance, inductive reactance, and capacitive reactance make up
Impedance
True Power
Apparent Power
When coupled with GPS, what system creates one of the most accurate navigation systems available
Instrument Landing System ILS
Inertial Reference System IRS
Flight Management System FMS
Grounding is defined as
when a mechanic finds a fault on the aircraft, and the airplane is no longer airworthy
providing an unintentional low resistance path, where full system voltage comes in contact with the return path for current
the process of electrically connecting conductive objects to either a conductive structure or return path
There are twenty-four satellites in six separate plains of orbit 12,625 miles above earth, how many are active, and how many are spares?
20 active/4 spares
16 active/4 spare/ 4 military use only
21 active/ 3 spares
What is an independent battery powered transmitter activated by the excessive G-forces experienced during a crash?
Emergency Locator Transmitter
Flight/Voice Recorder
Flight Recorder
Automatic direction finders (ADF) use radio waves at frequencies ranging from 3kHz to 3mHz and are known as
(HF) High frequency radio waves
ground or surface waves
VHF very high frequency radio waves
One method to protect wiring from oxygen, oil, fuel, alcohol or hydraulic fluid is to
route above these lines and equipment with a minimum seperation of 6 inches or more whenever possible
install in sealed conduits
apply insulating tape
Type something
What is a main benefit of GPS?
GPS is also relatively inexpensive
The accuracy due to four satellites always at a minimum of 15 degrees above the horizon
The immunity from service disruption due to weather
Capacitance is defined as the ability of a body to hold a.
Farads
microfarads 10 to the negative 6
Electric Charge
The relationship between two sine waves is defined as
a period is once the sine wave has completed one full cycle
phase relationship
wavelength frequency
Concerning weather radar systems, what color is reserved to depict intense or extreme precipitation or turbulence?
Chartreuse
Magenta
Red
What unit is found in almost all voltage regulation circuitry of a GCU
zener diode
carbon pile regulator
power rectifier diode
How many wire splices are allowed between two connectors?
the maximum number of wire splices allowed is 3
there is no limit to wire splicing on aircraft, as long as environmental splices are used
no more than one splice in any one wire segment
During the process of electromagnetic induction, the value of the induced voltage/current depends on what factors
Voltage, Current, Resistance
Number of turns, Strength of the electromagnet, Speed of rotation
Power (watts), Current, Voltage
Bonding is defined as
the electrical connecting of two or more conducting objects not otherwise adequately connected
providing an unintentional low resistance path to ground
when using B12 1/2 to secure antenna mounts properly to the fuselage and eliminate water intrusion
Which antenna type is highly direction-sensitive?
Loop Antenna
Dipole Antenna
What may be used to disconnect the Avionics Bus from the Main Bus during engine starting?
Avionics components are isolated during engine start by the reverse current contact relay.
Avionics master switch
Main Bus power control relay
What two satellites the COSPAS-SARSAT satellite system are used to receive an ELT signal?
LEOSAT/GEOSAT
ELTSAT/GEOSAT
ELTSAT/EMGSAT
When an owner/operator or technician wishes to install an electronic device in an aircraft that has no STC for the model aircraft in question, what must happen?
field approval and a form 337 must be filed to show the installation performed with approved data
They can install the device without any approval.
They must consult the aircraft's manual.
What is the effect of wires that come close together and couple interference and cause a detrimental upset to attached circuitry?
this effect is called shielding
this effect is called bonding
this effect is called crosstalk
The Radio Altimeter display indicates height above the terrain also known as a.
RAA
RAT
AGL
With the successful proliferation of global navigation satellite systems, has led to the development of a collision avoidance system known as a.
TCAS RA
ADS-B
TCAS
What component is used to ensure the alternator rotates at the correct speed to keep 400 Hz frequency?
3 Phase Delta or Wye connection
Generator Control Unit (GCU)
constant-speed drive
When using the double cord lacing method on wire bundles 1 inch in diameter or larger, the starting knot should be
a. bowline-on-a-bight
b. double half hitch with waxed lacing cord
c. clove hitch secured by a double-looped overhand knot
A cycle is defined as
the distance that a waveform travels during a period
whenever a voltage or current pass through a series of changes, return to the starting point, and then repeat the same
Hertz
Concerning radio navigation, what is one of the oldest and most useful navigational aids?
VHF
The Wet Compass
VOR
During battery installation, what lead must be installed last to minimize the risk of shorting the hot terminal?
the grounding lead
prior to battery installation, ensure the battery switch is off to protect from unintended engine starter engagement.
the positive lead
What aids in the identification of the performance capabilities of existing wiring to avoid using a lower performance or unsuitable replacement wire?
MIL-W-0036 Wire List in MFG manuals
The AWG chart
Part number followed by a five digit/letter CAGE code
What are two ways to protect electrical systems from faults?
mechanically and electrically
circuit breakers and fuses
GCU and BPCU
What term is often used when describing a magnetically operated switch?
DPDT
flux valve
contactor
What are the primary communication radios used in aviation?
VHF
UHF
HF
What removes gasses and acid fumes from the battery in order to reduce fire hazards or damage to airframe parts?
Battery Ventilating systems
Ram air effect to the battery compartment siphons the battery gasses overboard
Boric Acid or Sodium Bicarbonate
What is used to identify wires if direct marking is not possible?
Identification Sleeves
Hot Stamp Marking
Color Coded wires
What conductors are used to transmit and receive radio frequency waves?
Antennas
Coaxial
Coaxial Inductors
The maximum slack in wire bundles between support points should not exceed
3/4 inch
1 inch
1/2 inch
Two ways to charge batteries are a. Constant Current/Constant Polarity b. Constant Voltage/Constant Current c. Constant Voltage/Constant Potential
Constant Current/Constant Polarity
Constant Voltage/Constant Current
Constant Voltage/Constant Potential
One Hz equals one _____
CPS
Frequency
RPM
GCU is defined as
Generator Contact Unit
Generator Current Unit
Generator Control Unit
