Electronic Communications Systems Tomasi Chapter 7 And 8

47 Questions | Total Attempts: 42

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Communication Quizzes & Trivia

Electronic communications systems subject


Questions and Answers
  • 1. 
    Results whenever the phase angle of a sinusoidal wave is varied with respect to tiime
  • 2. 
    Angle Modulation results whenever the _________ of a sinusoidal wave is varied with respect to time
  • 3. 
    The two forms of angle modulation are ________ and ________
  • 4. 
    _______ is varying the frequency of a constant amplitude carrier directly proportional to the amplitude of the modulating signal at a rate equal to the frequency of the modulating signal
  • 5. 
    __________ is varying the phase of a constant amplitude carrier directly proportional to the amplitude of the modulation signal at a rate equal to the frequency of the modulating signal
  • 6. 
    Direct frequency modulation is varying the frequency of a ______ amplitude carrier directly proportional to the amplitude of the modulating signal at a rate equal to the frequency of the modulating signal.
  • 7. 
    Direct frequency modulation is varying the frequency of a constant amplitude carrier _____ ______ to the amplitude of the modulating signal at a rate equal to the frequency of tthe modulating signal.
  • 8. 
    When _____ of a signal is varied, it's phase is also varied
  • 9. 
    The ______ between frequency and phase modulation lies in which property of the carrier is directly varied by the modulating signal.
  • 10. 
    The difference between frequency and phase modulation lies in which property of the carrier is ____ _____ by the modulating signal
  • 11. 
    If the modulating signal ______ the frequency directly, frequency modulation results
  • 12. 
    If the modulating signal varies the frequency directly, _____ ______ results
  • 13. 
    If the modulating signal varies the phase directly, ___ ____ results.
  • 14. 
    FM has the ability to ______ _____, which is probably the biggest advantage of FM compared to AM
  • 15. 
    FM receivers can be fitted with _____ ______ to remove amplitude variations caused by noise, making FM more immune to noise.
  • 16. 
    FM receivers can be fitted with amplitude limiters to remove amplitude variations caused by noise, making FM more immune to noise. This is called __ ________
  • 17. 
    In __, once the signal has been contaminated by noise, noise cannot be removed
  • 18. 
    _____ can be improved further by increasing the frequency deviation of FM signals
  • 19. 
    Signal to noise ratio can be improved further by increasing the ______ of FM signals
  • 20. 
    Reduced noise improves _____
  • 21. 
    _____ improves system fidelity
  • 22. 
    Angle modulated signals are more _________
  • 23. 
    Amplitude of FM and PM remains _____
  • 24. 
    Amplitude is _____ of modulation depth
  • 25. 
    In angle modulation, _____ may be used, but all subsequent can be class C and therefore more power efficient
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