Podcast
Questions and Answers
Which of the following is the MOST accurate description of an engineer's primary responsibility?
Which of the following is the MOST accurate description of an engineer's primary responsibility?
- Designing, developing, and testing new communication technologies and systems. (correct)
- Maintaining and repairing existing communication systems.
- Managing the financial aspects of communication projects.
- Installing and configuring communication equipment for end-users.
Which task are technicians commonly expected to perform?
Which task are technicians commonly expected to perform?
- Designing complex circuit boards.
- Troubleshooting, repairing, and maintaining electronic equipment. (correct)
- Leading research and development projects.
- Developing new communication protocols.
When transmitting voice signals digitally, what process is used to convert the analog voice into a digital format?
When transmitting voice signals digitally, what process is used to convert the analog voice into a digital format?
- Phase Shift Keying
- Amplitude Modulation
- Pulse Code Modulation (correct)
- Frequency Modulation
Which choice lists the segments involved in the communication industry?
Which choice lists the segments involved in the communication industry?
What is the principal importance of standards in the communications industry?
What is the principal importance of standards in the communications industry?
Two-way communication where each party takes turns transmitting is known as what?
Two-way communication where each party takes turns transmitting is known as what?
A device that both transmits and receives signals is called a:
A device that both transmits and receives signals is called a:
What is the name for signals that travel through free space over long distances?
What is the name for signals that travel through free space over long distances?
The technique of transmitting multiple baseband signals simultaneously over a single channel is known as:
The technique of transmitting multiple baseband signals simultaneously over a single channel is known as:
What is term to describe making measurements at a distance?
What is term to describe making measurements at a distance?
Flashcards
Telemetry
Telemetry
Making measurements at a distance.
Reflection Principle
Reflection Principle
Used in radar to determine the location of objects by sending radio waves to objects. The time it takes for the wave to be reflected back determines the location. Very similar to sonar.
Amateur Radio
Amateur Radio
A type of radio communication hobby.
Device for digital data exchange via telephone network
Device for digital data exchange via telephone network
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Interconnections of PCs in offices/buildings
Interconnections of PCs in offices/buildings
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Generic synonym for Radio
Generic synonym for Radio
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Main job of a technician
Main job of a technician
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Transmitter
Transmitter
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Receiver
Receiver
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Transceiver
Transceiver
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Study Notes
- Telemetry is used to describe making measurements at a distance.
- Radio is used in the telephone system for paging, dispatch, remote control, and mobile radio phones.
- Radar uses the principle of reflection.
- Underwater radar is called sonar; examples include depth finders and fish finders.
- A popular radio communication hobby is amateur radio or ham radio.
- A modem enables computers to exchange digital data over the telephone network.
- Local area networks (LANs) refer to the systems of interconnections of PCs and other computers in offices or buildings.
- A generic synonym for radio is wireless.
- Three main types of technical positions in communication are engineer, technician, and sales representative.
- An engineer's job is design.
- The primary degree for an engineer is a Bachelor of Science (B.S.).
- The primary degree for a technician is an Associate of Science (A.S.).
- A type of technical degree in engineering other than engineer or technician is computer programmer.
- Holders of an associate of technology degree can sometimes transfer the credits to an engineering degree program.
- Technicians typically do building, testing, and repairing.
- Jobs in electronics outside engineering or technician work include sales representative, instructor, and writer.
- The four main segments of the communication industry include:
- Radio and television broadcasting which transmits audio and video programs.
- Telephone and data communications which enables voice and data exchange.
- Cable television which provides entertainment and information via cable.
- Satellite communications which relays signals using orbiting satellites.
- Standards are important for ensuring compatibility and interoperability of communication systems.
- Communication standards define characteristics like frequencies, power levels, and protocols.
- Electronic communication began in the 19th century.
- The four main elements of a communication system are transmitter, receiver, transmission medium, and intelligence.
- Five types of media are wire, radio, fiber optics, infrared, and underwater sound; the most common are wire, radio, and fiber optics.
- A modulator converts an information signal to a signal compatible with the transmission medium.
- A demodulator acquires a signal from a communication medium and recovers the original information signal.
- A transceiver is a device that can both transmit and receive signals.
- Communication mediums can affect a signal via attenuation and noise.
- A communication medium is also known as a transmission channel.
- Undesirable interference added to a signal being transmitted is called noise.
- Three common sources of interference are human-made noise, atmospheric noise, and space noise.
- Intelligence signals transmitted directly via a communication medium are called baseband signals.
- Intelligence signals can exist in analog and digital forms.
- One-way communication is called simplex; examples include radio broadcasting, TV broadcasting, and paging.
- Simultaneous two-way communication is called duplex; examples include telephone, VoIP, and full duplex radio.
- Two-way communication in which each party takes turns transmitting is called half duplex; examples include CB radio, push-to-talk radio, and some walkie-talkies.
- Continuously varying voice and video signals are called analog signals.
- On/off intelligence signals are called digital signals.
- Voice and video signals are transmitted digitally using analog-to-digital converters (ADCs).
- Terms often used to refer to original voice, video, or data signals are baseband signal, intelligence signal, and information signal.
- Modulation is used to make an information signal compatible with the medium over which it is being transmitted.
- Recovering an original signal is called demodulation.
- A broadband signal is a wide bandwidth signal.
- Multiplexing is the process used to transmit two or more baseband signals simultaneously over a common medium.
- Demultiplexing is the technique used to extract multiple intelligence signals that have been transmitted simultaneously over a single communication channel.
- Signals that travel through free space for long distances are called radio waves.
- A radio wave consists of electric and magnetic fields.
- Audio signals are not transmitted directly by electromagnetic waves because their frequencies are too low thus requiring large antennas.
- The human hearing frequency range is approximately 20 Hz to 20 kHz.
- The approximate frequency range of the human voice is about 300 Hz to 3 kHz.
- Radio transmissions do occur in the VLF and LF ranges but are used for specialized purposes like navigation.
- The frequency range of AM radio broadcast stations is 535 kHz to 1705 kHz.
- Radio signals in the high-frequency range (HF) are called short waves.
- TV channels 2 to 13 and FM broadcasting appear in the VHF segment of the spectrum.
- Five major uses of the UHF band are television broadcasting, mobile radio, radar, satellite communication, and radio astronomy.
- Frequencies above 1 GHz are called microwaves.
- Frequencies just above the EHF range are called infrared.
- A micrometer is used to measure the wavelengths of light waves and other tiny objects.
- The three segments of the optical frequency spectrum are infrared, visible light, and ultraviolet.
- A common source of infrared signals is heat.
- The approximate spectrum range of infrared signals is 0.7 μm to 1 mm.
- An angstrom is a unit of length equal to 10^-10 meters, used to measure the wavelengths of light.
- The wavelength range of visible light is approximately 400 nm to 750 nm.
- Light signals use fiber optics and free space channels for electronic communication.
- Two methods of transmitting visual data over a telephone network are facsimile and video conferencing.
- Paging signal individuals at remote locations by radio.
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