99533118-Frenzel.doc - Chapter 1 Introduction to Elec Comm 1 Communication is the process of Ans exchanging information 2 Two key barriers to

99533118-Frenzel.doc - Chapter 1 Introduction to Elec Comm...

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Chapter 1: Introduction to Elec Comm 1. Communication is the process of Ans: exchanging information 2. Two key barriers to human communication are Ans: distance and language 3. Electroniccommunicationswasdiscovered in which century? 4. Which of the following is not a major communications medium? Ans: Water 5. Random interference to transmitted signals is called Ans: noise 6. The communications medium causes the signal to be Ans: attenuated 7. Which of the following is not a source of noise? Ans: Another communications signal 8. One-way communications is called Ans: simplex 9. Simultaneous two-way communications is called Ans: Full duplex 10. The original electrical information signal to be transmitted is called the Ans: Baseband signal 11. The process of modifying a high frequency carrier with the information to be transmitted is called Ans: modulation 12. The process of transmitting two or more information signals simultaneously over the same channel is called Ans: Multiplexing 13. Continuous voice or video signals are referred to as being Ans: Baseband 14. Recovering information from a carrier is known as Ans: Detection 15. Transmission of graphical information over the telephone network is accomplished by Ans: facsimile 16. Measuring physical conditions at some remote location and transmitting this data for analysis is the process of Ans: Telemetry 17. Receiving electromagnetic emissions from stars is called Ans: Radio-astronomy 18. A personal communications hobby for individuals is Ans: ham radio 19. Radar is based upon Ans: reflected radio signals 20. A frequency of 27MHz has a wavelength of approximately Ans: 11m 21. Radio signals are made up of Ans: Electric and magnetic fields 22. The voice frequency range is Ans: 300 to 3000 Hz 23. Another name for signals in the HF range is Ans: shortwaves 24.Television broadcasting occurs inwhich ranges? 25. Electromagnetic waves produced primarily by heat are called Ans: infrared rays 26. A micron is Ans: One-millionth of a meter 27. The frequency range of infrared rays is approximately Ans: 0.7 to 100μm 28. The approximately wavelength of red light is Ans: 7000 Ǻ 29. Which of the following is not used for communications Ans: X-rays ©2008 Created by Kai Raimi – BHC COMMUNICATION ELECTRONIC 2 ND EDITION - FRENZEL 1
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30. A signal occupies the spectrum space from 1.115 to 1.122 GHz. The bandwidth is Ans: 7 MHz 31. In the united states, the electromagnetic spectrum is regulated and managed by Ans: FCC 32. For a given bandwidth signal, more channel space is available for signals in the range of Ans: EHF Chapter 2: AM and SSB Modulation 1. Having an information signal change some characteristic of a carrier signal is called Ans: modulation 2. Which of the following is not true about AM? Ans: The carrier frequency changes 3. The opposite of modulation is Ans: Demodulation 4. The circuit used to produced modulation is called a Ans: demodulator
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