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WorksheetsM12.7.2 Avionic Systems - Communications (ATA 23) Cat A3 V4.3.0
Total questions: 25
Worksheet time: 13mins
Which systems are used for communication inside the aircraft?
VHF system
HF system
Interphone and passenger address systems
SATCOM system
Which communication system allows communication via radio signals over a distance of up to 200 nm?
VHF system
HF system
SATCOM system
ELT system
What does ELT stand for in the context of aviation communication systems?
Electronic Locator Transmitter
Emergency Locator Transmitter
Enhanced Locator Transmitter
Exclusive Locator Transmitter
Which frequency band is used by the HF communication system for long-distance communication?
VLF
LF
HF
UHF
What modulation type involves varying the amplitude of the carrier wave?
Amplitude Modulation (AM)
Frequency Modulation (FM)
Phase Modulation (PM)
Digital Modulation (DM)
Which component is responsible for transferring acoustic information into an electrical signal?
Loudspeaker
Microphone
Headphones
Amplifer
How do high-frequency radio waves typically propagate?
Along the ground in a ground wave
Via reflection off the ionosphere in a sky wave
Through direct line transmission
By bouncing off satellites
What is the primary function of modulation in radio communication?
To select the correct frequency band
To amplify the radio signal
To adjust the antenna length
To encode information onto the carrier frequency
Which component of the aircraft's communication system converts the electrical signal back into acoustic information?
Microphone
Loudspeaker
Antenna
Transceiver
What is the purpose of an antenna coupler in the HF communication system?
To adjust the sensitivity of reception
To select the operational mode
To tune the antenna to the selected frequency
To amplify the received signal
What frequency range is typically used for the VHF communication system in aircraft?
2 MHz to 30 MHz
30 kHz to 300 kHz
118 MHz to 136.975 MHz
4 GHz to 6 GHz
Which frequency is an international emergency frequency used for transmissions in case of emergencies?
2 MHz
30 kHz
121.5 MHz
4 GHz
How are SATCOM transmissions typically facilitated?
Through ground-based antennas only
Via satellites, aircraft earth stations, and ground earth stations
Using high-frequency radio waves
Through direct line-of-sight transmission
What is the primary function of an Emergency Locator Transmitter (ELT)?
To facilitate communication with air traffic control
To transmit distress signals in case of emergencies
To provide aircraft navigation data
To amplify radio signals for long-distance communication
What is the VHF frequency range?
What is the HF frequency range?
How long is the service life of the fixed Emergency Locator Transmitter (ELT)?
24 hours
48 hours
7 Days
An Oscillator, modulator and power amplifier form the main components to which of these systems?
Transmitter
Receiver
Regulator
Differential
An audio amplifier, tuning unit and demodulator form the main components to which of these systems?
Transmitter
Receiver
Regulator
Differential
If side-tone is present when you transmit, what does this signify?
The communication system is transmitting successfully
The communication system is still receiving
The communication system is unable to transmit or receive
The communication system is receiving data so no audio is available.
How is an ELT activated?
Select all correct answers
Inertia switch (G force Switch)
Contact with water
Speed Sensor (Retardation Rate)
Pressure Sensor
Aircraft Power Loss
What name is given to the special feeders for radar frequency signals.
Micro-Strips
Co-Axial Cable
Which of the following statements is true regarding a HF Communication System?
An antenna coupler alters the electrical length of the antenna
An antenna coupler alters the mechanical length of the antenna
An antenna coupler, allow 2 HF systems to transmit simultaneously.
What is the VHF voice communication frequency range?
137 MHz - 150 MHz
100 MHz - 118 MHz
118 MHz - 137 MHz
90 kHz - 150 kHz
Which are the three main components of the SATCOM system?
