Podcast
Questions and Answers
What is the term for the rate at which vibrations occur in sound?
What is the term for the rate at which vibrations occur in sound?
- Frequency (correct)
- Wavelength
- Amplitude
- Displacement
What type of waves do sound travels through the air as?
What type of waves do sound travels through the air as?
- Transverse waves
- Longitudinal waves (correct)
- Electromagnetic waves
- Mechanical waves
What is the range of frequencies that the human ear can detect?
What is the range of frequencies that the human ear can detect?
- 10 Hz to 10 000 Hz
- 1 Hz to 1 000 Hz
- 20 Hz to 20 000 Hz (correct)
- 100 Hz to 100 000 Hz
What is the term for the compression of air particles when a vibrating surface moves closer to them?
What is the term for the compression of air particles when a vibrating surface moves closer to them?
What is the minimum particle displacement that the human ear can detect?
What is the minimum particle displacement that the human ear can detect?
Why are intercom systems necessary in aircraft?
Why are intercom systems necessary in aircraft?
What is a common characteristic of intercom and telephone systems?
What is a common characteristic of intercom and telephone systems?
What is the purpose of an antenna in a radio transmission system?
What is the purpose of an antenna in a radio transmission system?
What type of current is required to produce an expanding and collapsing EM field?
What type of current is required to produce an expanding and collapsing EM field?
What determines the required length of an antenna for effective transmission?
What determines the required length of an antenna for effective transmission?
What is the range of frequencies for human voice in normal speech?
What is the range of frequencies for human voice in normal speech?
What happens to the EM field when an electric current is transmitted along a conductor?
What happens to the EM field when an electric current is transmitted along a conductor?
What is the wavelength of a carrier frequency of 10 megahertz?
What is the wavelength of a carrier frequency of 10 megahertz?
What is the primary method of rejecting noise in AM receivers?
What is the primary method of rejecting noise in AM receivers?
What is the main advantage of frequency modulation over amplitude modulation?
What is the main advantage of frequency modulation over amplitude modulation?
What is the primary characteristic of the wave that is changed in amplitude modulation?
What is the primary characteristic of the wave that is changed in amplitude modulation?
What is the primary method of modulating a radio wave?
What is the primary method of modulating a radio wave?
Why is frequency modulation used instead of amplitude modulation?
Why is frequency modulation used instead of amplitude modulation?
What is a limitation of satellite communication systems in aircraft?
What is a limitation of satellite communication systems in aircraft?
What is a characteristic of full duplex operation in aircraft communication systems?
What is a characteristic of full duplex operation in aircraft communication systems?
How are satellite calls, mainly over water, connected to the public telephone network?
How are satellite calls, mainly over water, connected to the public telephone network?
What is required to provide connectivity to each passenger seat in an aircraft?
What is required to provide connectivity to each passenger seat in an aircraft?
What is the purpose of a transceiver in a passenger communication system?
What is the purpose of a transceiver in a passenger communication system?
What type of data can be transmitted through a radio link between an aircraft and the ground?
What type of data can be transmitted through a radio link between an aircraft and the ground?
What is the primary factor that affects the range of HF radio transmissions?
What is the primary factor that affects the range of HF radio transmissions?
Why do aircraft HF transmitters typically have higher output power than VHF transmitters?
Why do aircraft HF transmitters typically have higher output power than VHF transmitters?
What is the primary reason why jet aircraft rarely have long wire HF antennas?
What is the primary reason why jet aircraft rarely have long wire HF antennas?
What is the purpose of the weak point in an HF antenna installation?
What is the purpose of the weak point in an HF antenna installation?
What is the typical configuration of an HF antenna on a light aircraft?
What is the typical configuration of an HF antenna on a light aircraft?
What is the primary advantage of HF radios over VHF radios in aircraft communications?
What is the primary advantage of HF radios over VHF radios in aircraft communications?