Aeroplane Intercom System

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What is a significant risk of communication without a system in place during flight?

Reduced aircraft performance

Delays in response

Increased fuel consumption

Misunderstood or unheard messages (correct)

What is the primary function of a microphone in the intercom system?

To convert sound into electrical signals (correct)

To transmit sound waves

To record sound electrically

To amplify sound signals

What is the component of a microphone that vibrates in response to sound waves?

Carbon dust

Amplifier

Diaphragm or ribbon (correct)

Transducer

What is the principle behind the operation of carbon microphones?

Changing resistance due to sound waves Signup and view all the answers

What is the ultimate purpose of the electrical signal generated by a microphone?

To convert it back into sound Signup and view all the answers

What is the purpose of the amplifier in the intercom system?

To amplify electrical signals Signup and view all the answers

What is a common characteristic of intercom and telephone systems?

Both persons can talk and listen at the same time Signup and view all the answers

What is the role of the antenna in radio transmission?

To generate an electromagnetic field Signup and view all the answers

What type of current produces an expanding and collapsing field that radiates electromagnetic waves?

Alternating Current (AC) Signup and view all the answers

What determines the required length of an antenna for effective transmission?

The frequency of the signal to be transmitted Signup and view all the answers

What is the range of human voice frequencies for normal speech?

90 Hz to 10 kHz Signup and view all the answers

What is the medium used for transmission in radio systems?

The atmosphere Signup and view all the answers

What is the primary function of a speaker in an aeroplane communication system?

To convert an electrical signal into sound Signup and view all the answers

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 Signup and view all the answers

What is the primary function of a microphone in an aeroplane communication system?

To convert sound into an electrical signal Signup and view all the answers

What is the effect of using a 'hot mike' in an aeroplane communication system?

It eliminates the need to press the transmit button Signup and view all the answers

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 Signup and view all the answers

What is the effect of adjusting the volume knob in an aeroplane communication system?

It controls the speaker volume (amplifier gain) Signup and view all the answers

What is the primary benefit of satellite communication systems in an aircraft?

To provide additional communication links to the VHF band Signup and view all the answers

What type of data can be carried through the radio link between the aircraft and the ground?

Virtually any type of data Signup and view all the answers

What is required for full duplex operation in a satellite communication system?

A full suite of hardware for both the transmitter and receiver Signup and view all the answers

Where is information sent to after being transmitted from the phone handset in a satellite-based passenger communication system?

An orbiting satellite Signup and view all the answers

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 Signup and view all the answers

What is a common limitation of satellite communication systems in aircraft?

They are expensive to install and operate Signup and view all the answers

What is the primary purpose of emergency location equipment in aircraft?

To transmit emergency signals during forced or emergency landing Signup and view all the answers

What is the frequency used by Emergency Locator Beacons/Transmitters (ELBs/ELTs)?

406.025 Megahertz Signup and view all the answers

What is the function of the COSPAS-SARSAT system?

To provide satellite-based ELT monitoring services Signup and view all the answers

What type of signal is transmitted by Emergency Locator Beacons/Transmitters (ELBs/ELTs)?

Distress signal with coded aircraft identification and GPS coordinates Signup and view all the answers

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 Signup and view all the answers

What type of beacon is used to detect emergency signals underwater?

Underwater Locater Beacons (ULBs) Signup and view all the answers