30 Questions
What is a significant risk of communication without a system in place during flight?
Misunderstood or unheard messages
What is the primary function of a microphone in the intercom system?
To convert sound into electrical signals
What is the component of a microphone that vibrates in response to sound waves?
Diaphragm or ribbon
What is the principle behind the operation of carbon microphones?
Changing resistance due to sound waves
What is the ultimate purpose of the electrical signal generated by a microphone?
To convert it back into sound
What is the purpose of the amplifier in the intercom system?
To amplify electrical signals
What is a common characteristic of intercom and telephone systems?
Both persons can talk and listen at the same time
What is the role of the antenna in radio transmission?
To generate an electromagnetic field
What type of current produces an expanding and collapsing field that radiates electromagnetic waves?
Alternating Current (AC)
What determines the required length of an antenna for effective transmission?
The frequency of the signal to be transmitted
What is the range of human voice frequencies for normal speech?
90 Hz to 10 kHz
What is the medium used for transmission in radio systems?
The atmosphere
What is the primary function of a speaker in an aeroplane communication system?
To convert an electrical signal into sound
What is the purpose of an amplifier in an aeroplane communication system?
To increase the small audio input voltage to a higher power audio signal
What is the primary function of a microphone in an aeroplane communication system?
To convert sound into an electrical signal
What is the effect of using a 'hot mike' in an aeroplane communication system?
It eliminates the need to press the transmit button
What is the purpose of a push-to-talk (PTT) button in an aeroplane communication system?
To input the microphone signal to the intercom amplifier
What is the effect of adjusting the volume knob in an aeroplane communication system?
It controls the speaker volume (amplifier gain)
What is the primary benefit of satellite communication systems in an aircraft?
To provide additional communication links to the VHF band
What type of data can be carried through the radio link between the aircraft and the ground?
Virtually any type of data
What is required for full duplex operation in a satellite communication system?
A full suite of hardware for both the transmitter and receiver
Where is information sent to after being transmitted from the phone handset in a satellite-based passenger communication system?
An orbiting satellite
What is the purpose of the transceiver in a passenger communication system?
To transmit information from the phone handset to a ground radio base station
What is a common limitation of satellite communication systems in aircraft?
They are expensive to install and operate
What is the primary purpose of emergency location equipment in aircraft?
To transmit emergency signals during forced or emergency landing
What is the frequency used by Emergency Locator Beacons/Transmitters (ELBs/ELTs)?
406.025 Megahertz
What is the function of the COSPAS-SARSAT system?
To provide satellite-based ELT monitoring services
What type of signal is transmitted by Emergency Locator Beacons/Transmitters (ELBs/ELTs)?
Distress signal with coded aircraft identification and GPS coordinates
What is the purpose of the unique frequency assigned to in-flight systems?
To prevent interference with the plane's navigation, communications, or data processing equipment
What type of beacon is used to detect emergency signals underwater?
Underwater Locater Beacons (ULBs)
Learn about the importance of intercom systems in aviation and how they work, including the role of microphones, speakers, and amplifiers. Understand the basics of sound transmission and electrical signals. Test your knowledge of aeroplane systems and turbine aeroplane technology.
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