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WorksheetsAMTBLK06 Final A
Total questions: 45
Worksheet time: 23mins
terms are used when two waveforms go through their maximum and minimum points at different times to describe the phase difference?
lead and lag
capacitive and inductive reactance
positive peak 90/ negative peak 270
phase shift created by inductive reactance always causes voltage to
lag current
lead current
remain in phase with current
choice that best completes the statement or answers the question. An example of SWAMP area for aircraft wiring
Storing aircraft in a dry environment has eliminated the environmental exposure to aircraft wiring
When aircraft enter MRO’s for inspection, the facility will inspect the wiring for SWAMP exposure
near wing flaps, wing folds, or pylons
VHF communication transceivers are coupled with VOR receivers, 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
Identify the choice that best completes the statement or answers the question. Whenever troubleshooting aircraft electrical circuits, it is always valuable to consider Ohm’s Law
Ohm’s law is of little use in troubleshooting, always consult the manufactures drawings.
remembering that a low resistance means increased current and can explain why circuit breakers pop or fuses blow
The law was named after German Physicist George Simon Ohm
wire type can be severely damaged on the inside without any evidence of damage on the outside?
PTFE wiring
ETOPS wiring
coaxial cable
Identify the choice that best completes the statement or answers the question. While starting the engine the starter can often draw 100 or more amperes, for this reason, a. all starter motors are controlled through a solenoid b. all starter motors must be brushless DC starters. c. all starters must be shunt wound starters
all starter motors are controlled through a solenoid
all starter motors must be brushless DC starters
all starters must be shunt wound starters
Identify the choice that best completes the statement or answers the question. The Altitude Encoder convert the aircraft’s pressure altitude to a code and send to ATC from the transponder when selected to ALT. This system works between the altitudes of
1000 feet MSL- 40,000 feet MSL
1200 feet MSL- 100,000 feet MSL
1200 feet MSL-126,700 feet MSL
What BUS is directly connected to the battery?
Main AC bus
emergency AC bus
hot battery bus
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 ADF antenna is omnidirectional and placement has no correlation to operation
the received signal induces voltage that is sent to two stators in a resolver or goniometer
Apparent power is symbolized by what letter?
S
VA
AP
When substitution of a wire is required, which of the following statements is true?
Wiring replacement is a generally accepted method for repair, or to remove aged or cracked wiring in SWAMP conditions.
Prior to replacing the wiring, the maintenance manual must be reviewed if the Original Manufacture has approved any substitution.
It is permissible to increase wire size 10% of existing wire due to the dielectric breakdown of aging aircraft wiring.
How is bare copper wire protected from developing a surface oxide coating
insulated with Tefzel, Teflon/Kapton, or PTFE/Polyimide/PTFE
coated with tin, silver, or nickel
when properly connected and insulated the conductor material will not oxidize, per MIL-SPEC-6896
Ohm’s Law States
Ohms law states 1 henry equals 1volt when current changes at 1 amp per second.
The law of electromagnetic induction is proportional to the rate of change to the lines of Flux
The current through a conductor is directly proportional the voltage applied and inversely proportional to the resistance of a conductor.
The movement of electrons is defined as
Atomic Theory
Kinetic Theory
Electrical Current
What is described as a single, solid conductor, or a stranded conductor?
Cable
Conductor
Wire
What form is to be completed and returned to the FAA with an Inspection Authorization when installing new avionics not on the aircraft’s approved equipment list?
FAA form 338
FAA form 337
FAA form 121.90C
Of the many types of connectors, backshell adapters designed for shield termination are used for _______ protection
ESD/EMF
EMI/RFI
CSD/GCU
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?
A field approval and a form 337 must be filed to show the installation performed with approved data
The owner/operator has full authority to submit the FAA form 337 within 90 days of installation of any new electronic disco equipment.
A field approval and a form 337 must be filed to show the installation performed with approved crypto data.
When junction boxes are used in high-temperature areas, they should be made of:
Stainless Steel
T-6 Aluminum
T-24 Aluminum
What system is used to increase the accuracy of GPS for aircraft navigation, and is known to reduce position errors to 1-3 meters laterally and vertically?
Wide Area Augmentation System (WAAS)
Enhanced Ground Proximately Warning System (EGPWS)
GNSS NAV/ GPS Position
The primary effect of a coil is its property to oppose any change in current through it. This property is called:
inductance
magnetic induction
mutual induction
What components make up a Three-Unit Regulator?
voltage relay, current relay, reverse current relay
GCU, voltage regulator, reverse current sensing
voltage regulator, field winding, battery controller
What diode is used in voltage regulation?
reverse current relay
zener diode
strength of magnetic field
There are three factors that can create an opposition to the flow of electrons in an AC circuit. What are they?
a. number of coils, speed of rotation, strength of magnetic field
b. number of turns, cross-sectional area of coil, length of a coil, and core material around which the coil is formed
c. resistance, inductive reactance, and capacitive reactance
The value at any instant in time along the AC wave is:
Instantaneous Value
RMS, .707, Effective Value, the point where AC/DC resistors dissipate heat equally
Peak Value
An antenna that is half the wavelength of the corresponding AC frequency will:
allow full voltage and current flow in both the 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
The exact shape and material from which an antenna is made has no affect on the carrier signal modulation
An emergency locator transmitter (ELT) will transmit a digital signal
every 50 seconds at 5 watts for at least 24 hours
every 30 seconds at 5 watts for at least 90 days
every minute at 5 watts for at least 30 days
What devices manipulate electricity for the transmission of useful information through the atmosphere or space?
(SDAC) Systems Digital Analog Converter
Radio Transmitters and Receivers
AC Rectifiers/DC Inverters
A course deviation indicator (CDI) is another name for
VOR indicator
VHF indicator
DME indicator
The process of producing an EMF by moving a magnetic field in relationship to a conductor
Lens Law
electromagnetic induction
electromechanical switch
Reverse Current sensing indicates
a. a parallel or shunt generator has been installed incorrectly
b. generator leads have been crossed during installation and should be reversed
c. current is flowing to the generator not from the generator
Which is not a factor affecting resistance
Length
The Diameter
Number of turns
Concerning coaxial cable, what protects the inner conductor from an external fields?
Braided Cover
Central Conductor
Dielectric-Insulator
What cockpit instrument combines indications from a magnetic compass, VOR, and ADF into one instrument?
PFD
EADI
RMI
What navigation system uses the NAVSTAR satellites set and maintained in orbit by the U.S. Government?
GPS
GNS
FMS
What is used on most multi-engine, high performance turbine powered aircraft and transport category aircraft?
Piston engines
Turbofan engines
Where is the commutator located?
at the end of an armature
in the field windings
before the slip rings and adjacent to the insulating material
What produces electricity using two different metals in a chemical solution?
thermoelectric effect
silicone and germanium
primary battery
What system is used primarily during instrument approach and low level or night flight below 2500 feet?
Radio Altimeter
Weather Radar
HUD/FLIR Heads Up Display/Forward Looking Infrared
What is the process of equalizing alternator outputs on twin engine aircraft?
Compounding Alternator Output
Paralleling
Rectified AC output/ Inverted DC output
What is a RAT?
rectified, alternating current, transformer
resistance from alternating current transformers
ram air turbine
What has direct effect on generator output?
commutator action
generator size
strength of the magnetic field
When testing Bonds or Grounds, the resistance should not exceed
.003 OHMS
30 OHMS
3.0 OHMS
What are the two fundamental properties of insulation materials?
current strength of conductor, and ability to withstand harsh environmental conditions
heat resistance, area of conductor
insulation resistance, dielectric strength
