COMM final quiz
Emergency Locator Transmitter Quiz
Test your knowledge about Emergency Locator Transmitters (ELTs) and satellite communication systems with this comprehensive quiz. Covering a wide range of topics, from the fun
- 50 multiple-choice questions
- Focus on ELT systems, SATCOM, and VHF communications
- Improve your understanding of aviation safety devices
ELT stands for?
Emergency Locator Transmitter
Emergency Location Transceiver
Extra Large Transmitter
Electronic LORAN Transmitter
Historically, many ELT failures were due to?
Poor maintenance practices
Insufficient range capabilities
Poor design
Interference from the ionosphere
After an accident, the ELT...
Uses GPS data to detect deceleration
Automatically senses a crash and sends out emergency radio signals
Triggers a rescue when the signal stops transmitting
Receives information from ATC to aid in rescue attempts
Maintenance of ELT....
Is no longer necessary because of the use of integrated circuitry
Is governed by manufacturers specifications
Is limited to visual inspection of the antenna and LRU
Requires a yearly inspection and test
ELT....
Uses a barometric bellows to detect rapid deceleration
Uses GPS data to detect rapid deceleration
Uses an accelerometer to detect rapid deceleration
Uses data from the ADC to detect rapid deceleration
The 406 MHz ELT system....
Can provide a fix within 1 to 3 miles of a downed aircraft
Will soon be obsolete
Has completely replaced the 121.5 MHz system
Use frequency matching to locate downed aircraft
The 406 MHz ELT system....
Is strictly a receiver
Transmits about 1/10 of power
Transmits about 5W of power
Does not require satellites for operation
A dongle system....
Keeps the battery charged in an ELT
Provides GPS data for tracking in an emergency
Allows for an ELT to be used in different aircraft
Ensures the correct ELT is installed in an aircraft
The ELT system uses the following frequencies...
121.5 MHz, 243 MHz, and 406 MHz
108.00 MHz to 395 MHz
121.5 MHz to 406 MHz
2 GHz to 4 GHz
SATCOM....
Do not allow voice transmissions because it is a digital system
Requires 24 satellites to provide a positional fix
Is limited due to the effect of sunspot activity on the ionosphere
Is a superior communications technology
One advantage of SATCOM...
Is the precision of the positional fix
Is the capability for encryption
Is the ability to split frequencies
Is the fact that they do not require antennas
To be effective, SATCOM antennas aboard aircraft....
Must point to the satellites
Are omnidirectional
Must be mounted in pairs for transmission and reception
Are usually mounted on the bottom of the fuselage
SATCOM operates....
By comparing the signals of three satellites to provide a 2D positional fix
By interrogating a satellite and timing the response
By relaying information through satellites and ground stations
Be relaying communications between satellites at achieve long distance communication
SATCOM antennas....
Are more complex than most because of the requirement to aim the antenna at the satellites
Tend to be large because of the large distances involved
Are simpler than most because they are omnidirectional
Require regular calibration to ensure data integrity
SELCAL stands for....
Select calibration
Selection calculation
Selected call answering limit
Selective calling
The use of SELCAL....
Reduces the volume of HF reception until a code is received
Reduces the interference from selected frequencies
Provides privacy over HF transmissions
Provides precise positional fixes in 2D and 3D
The Selcal decoder...
Allows the pilot to select a 4 digit number to transmit to air traffic controllers
Allows for a code of 4 letters to be used to identify an aircraft uniquely
Decrypts messages that have been scrambled for privacy or security
Distributes all audio within the service interphone system
The use of Selcal...
Is restricted for emergency use only
Is restricted to a 200 mile limit
Is only used for travelling over oceans
Extends the range of VHF communications
The Selcal decoder...
Is controlled by rotary switches in the cockpit
Has rotary switches with numbers on them
Is only operational in USB mode
Will cause an illuminated warning on the flight deck if it recognizes special tones
Selcal tones...
Are in the 3MHz to 30MHz range
Are four tones transmitted in mixed pairs
Assure unique identification because the possible combinations are almost infinite
Alert the pilot of various errors in the system
Selcal operates in the...
VHF band
HF band
UHF band
HF and VHF band
What is the typical audio level on an aircraft speaker?
10 Watts
1 Watt
25 milli Watts
1 milli Watt
The typical impedance of an aircraft microphone set is..
8 Ohms
50 Ohms
150 Ohms
500 Ohms
What is the frequency range of an aircraft 760 channel VHF communication radio
100Hz to 10KHz
2MHZ to 30MHz
118.00MHz to 135.975MHz
118.00MHz to 136.975MHz
Communications Systems...
Provide audio only communication between the aircraft and the ground
Are used to move information
Are all radio based
Do not include digital data transfer
VHF-Com...
Is a special subset of the VHF Radio Frequency Band
Is also known as simply VHF
Is only used for non-critical communications due to its unreliability
Has been mostly replaced by GPS
VHF...
Is strictly reserved for aviation use
Is used for long distance transoceanic travel
Is used by aviation, fire, police and taxi services
Takes advantage of radio waves following the contour of the earth
The VHF control panel/head...
Is where station frequencies are selected
Indicates which VHF station is nearest the aircraft
Is where navigation information is stored
Routes all VHF audio signals to where they are required
The VHF radio...
Is a transmitter
Is a transceiver
Is a receiver
Is a transponder
For VHF, the PTT...
Switches the radio from receive to transmit
Activates the Power Transfer Takeoff
Mutes the audio from the mic
Is not used
The VHF transceiver is normally...
In scan mode
In single sideband (USB) mode
In transmit mode
In receive mode
A VHF communication transceiver...
Requires two antennas, one for transmission, and another for reception
Requires one antenna per transceiver because it does not transmit and receive at the same time
Requires an internal antenna to reduce drag
Does not require an antenna because it is only for internal communications
How many VHF transceivers is normal for airliners?
5
3
1
2
HF communication systems...
Are used only over ground stations
Takes advantage of radio waves following the contour of the earth
Uses direct line of sight transmission
Are used for long distance communications
HF comms are unique in their requirement for...
An antenna coupler
A tone based on a four letter ID
Noise cancelling circuitry
Internal antennas
The purpose of the HF antenna coupler is...
To provide protection from EMF interference
To combine the transmitted and received signals
To match the antenna impedance to the selected frequency electronically
To join the antenna to the AMU
The USB selection on the HF control panel...
Selects single side band operation
Allows for transfer of data through the control panel via stick
Is only used for ground maintenance
Stores HF data for the entire flight
When transmitting a call on an aviation radio, what is said second?
"Testing testing"
"This is"
The name and type of the station being called
Your call sign
What is the spoken word for urgency?
Help
Mayday
Urgent
Pan Pan
"Repeat" is not an acceptable word in communication. Which word has the same meaning and is acceptable?
Come back now
Once again
Read over
Say again
In the phonetic alphabet used in aviation, what is the spoken word for the letter "A"
Albert
Alpha
Able
Apple
Troubleshooting is...
Running BIT tests to find a problem
Using a multimeter to measure resistance
Replacing components to fix a snag
A systematic approach to problem solving
Troubleshooting...
Is not strictly an avionics technician responsibility
Applies only to electronic systems
Is unique to aviation
Is no longer required because of computerized systems
The swap components method of troubleshooting...
Is the best method
Is not a true method of troubleshooting
Is one of many methods
Is the cheapest method of troubleshooting
Troubleshooting involves...
Applying what you know to a problem in an organized way
Informing the pilot of the steps taken
Programming test equipment
Reducing costs by reducing weight
Gather and Evaluate Information...
Is done away from the aircraft
Is not required
Is optional if you have test equipment
Is the first step in troubleshooting
Two key foundational sources of information are...
Test equipment and observation
Pilots and supervisors
Training/Education and Manuals/Textbooks
EFIS and DME
Symptoms...
Help to determine the nature of a problem
Only appear when a piece of equipment has completely failed
Are invisible signs of malfunction
Require test equipment to measure
Experience...
Means that you don't need to troubleshoot
Usually results in fewer snags
Leads to complacence
Shortens the troubleshooting process
Questions...
Indicate a lack of system knowledge
Should be asked to narrow down possible causes of the problem
Are of limited usefulness in troubleshooting
Are only useful if you have access to the pilot
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