Aeroplane Systems: Speakers and Microphones
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Questions and Answers

What is the primary function of an amplifier in an audio system?

  • To produce a very low voltage signal
  • To convert sound into electrical signals
  • To increase the small audio input voltage to a higher power audio signal (correct)
  • To convert electrical signals into sound
  • What happens when the push-to-talk button is pushed?

  • The microphone signal is output to the speaker
  • The microphone signal is input to the intercom amplifier (correct)
  • The amplifier gain is increased
  • The speaker volume is decreased
  • What is the main disadvantage of using hot mikes?

  • The amplifier gain is decreased
  • Any background noise is transferred over the intercom (correct)
  • The initial audio signal is too low
  • The microphone signal is not input to the amplifier
  • What converts electrical signals into sound in a speaker?

    <p>The coils of wire in the speaker</p> Signup and view all the answers

    What controls the speaker volume?

    <p>The volume knob</p> Signup and view all the answers

    What type of signal does a microphone produce?

    <p>A low voltage signal</p> Signup and view all the answers

    What is a major drawback of satellite communications in terms of latency?

    <p>0.25 second delay in all communications</p> Signup and view all the answers

    What is a limitation of satellite communications in terms of coverage?

    <p>Lack of coverage at high latitudes</p> Signup and view all the answers

    What is the primary reason why HF communications and data systems are still favored over satellite communications?

    <p>Higher cost of satellite communications</p> Signup and view all the answers

    What is a potential application of satellite communications in the future?

    <p>Passenger communications</p> Signup and view all the answers

    How many geostationary satellites were part of the INMARSAT system launched in the early 1980s?

    <p>3</p> Signup and view all the answers

    What is a limitation of fitting satellite communications on aircraft?

    <p>Size of the avionics package</p> Signup and view all the answers

    What is the primary function of the headphone jack in the CVR system?

    <p>To perform audio checks during testing</p> Signup and view all the answers

    What is the purpose of the erase button in the CVR system?

    <p>To completely erase the memory</p> Signup and view all the answers

    What are the preconditions for erasing the memory in the CVR system?

    <p>Weight on wheels, park brake set, and erase button pressed for greater than a set time</p> Signup and view all the answers

    What is recorded on Channel 1 of the CVR system?

    <p>The flight interphone and passenger address</p> Signup and view all the answers

    What is the function of the LED status indicator in the CVR system?

    <p>To indicate serviceability during tests</p> Signup and view all the answers

    What is the purpose of a microphone in the CVR system?

    <p>To record cockpit area communication</p> Signup and view all the answers

    What is the main advantage of HF radios over VHF communications?

    <p>Capability of transmitting worldwide</p> Signup and view all the answers

    How do HF radios achieve long-range communication?

    <p>By using sky waves refracted through the ionosphere</p> Signup and view all the answers

    What is a characteristic of HF transmitters in aircraft?

    <p>High output power of 80-200 watts</p> Signup and view all the answers

    What can affect HF communication in an aircraft?

    <p>Atmospheric interference and thunderstorms</p> Signup and view all the answers

    What type of antenna is commonly used on modern aircraft with HF?

    <p>Long wire antenna</p> Signup and view all the answers

    Why are long wire antennas rarely used on jet aircraft?

    <p>Due to vibration and increased risk of damage at high speeds</p> Signup and view all the answers

    What is the primary function of an underwater locator beacon?

    <p>To act as a homing signal for emergency services</p> Signup and view all the answers

    What frequency do underwater locator beacons transmit on?

    <p>37.5 kHz</p> Signup and view all the answers

    What is the purpose of the self-erecting antenna in an emergency locator transmitter?

    <p>To erect the antenna when the ELB is activated</p> Signup and view all the answers

    Where is the emergency underwater locator beacon typically located?

    <p>As part of the flight data recorder</p> Signup and view all the answers

    What type of signal does an underwater locator beacon emit?

    <p>A constant beeping</p> Signup and view all the answers

    What is the primary function of a cockpit voice recorder?

    <p>To monitor all signals and conversations in the cockpit</p> Signup and view all the answers

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