3d1x2 5 Level CDC Vol. 1

69 Questions | Total Attempts: 1886

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CDC Quizzes & Trivia

Questions and Answers
  • 1. 
    What is an example of analog-to-digital and digital-to-analog techniques?
    • A. 

      Amplitude modulation(AM) and freqeuncy modulation (FM)

    • B. 

      Pulse code modulation (PCM) and frequency shift keying (FSK)

    • C. 

      Phase modualtion (PM) and quadrature phase shift keying (QPSK)

    • D. 

      Pulse code modulation (PCM) and continuously variable slope delta (CVSD) modulation

  • 2. 
    What converts analog signal informaton into an analog carrier signal?
    • A. 

      Delta modulation (DM)

    • B. 

      Digital modulation

    • C. 

      Analog modulation

    • D. 

      Adaptive modulation

  • 3. 
    What converts analog signal informaton into a digital carrier signal?
    • A. 

      Delta Modulation (DM)

    • B. 

      Digital modulation

    • C. 

      Analog modulation

    • D. 

      Adaptive modulation

  • 4. 
    The information-carrying components that occur on either side of a carrier are called
    • A. 

      Sidebands.

    • B. 

      Sine waves.

    • C. 

      Frequency translators.

    • D. 

      Modulating fequencies.

  • 5. 
    Amplitude modulation (AM) requires a bandwith that is
    • A. 

      Twice that of the modulating signal.

    • B. 

      Half that of the modulating signal.

    • C. 

      Twice that of the carrier signal.

    • D. 

      Half that of the carrire signal.

  • 6. 
    The upper sideband in a single-sideband suppressed carrier (SSBSC) modulation is eliminated by
    • A. 

      Filtering.

    • B. 

      Detection.

    • C. 

      Compression.

    • D. 

      Companding.

  • 7. 
    We can express the 6-to-1 improvement of the single-sideband suppressed carrier (SSBSC) mopdulation over conventional amplitude modulation (AM) as
    • A. 

      2 decibels (dB) of improvement

    • B. 

      4 decibels of improvement

    • C. 

      6 decibels of improvement

    • D. 

      8 decibels of improvement

  • 8. 
    The only basic waveform in nature is a
    • A. 

      Carrier wave.

    • B. 

      Pure sine wave.

    • C. 

      Resultant wave.

    • D. 

      Composite wave.

  • 9. 
    A modulated waveform that contains a carrier plus two sidebands for each modulation frrequency is a description of
    • A. 

      A phase modulation (PM).

    • B. 

      Pulse modulation.

    • C. 

      A frequency modulation.

    • D. 

      An amplitude modulation (AM).

  • 10. 
    If 100 percent modulation is exceeded and there is distortion in the modulating signal, addititonal sidebands are generated. We indentify these sidebands as what?
    • A. 

      Transmitted intelligence

    • B. 

      Intensity of speech

    • C. 

      Composite waves

    • D. 

      Splatter

  • 11. 
    The amount of deviation in a frquency modulation (FM) signal is directly proportinal to the modulating signal's
    • A. 

      Phase.

    • B. 

      Amplitude.

    • C. 

      Frequency.

    • D. 

      Apmlitude and frequency.

  • 12. 
    The amount of phase shift in a phase modulation (PM) signal is directly proportional to the
    • A. 

      Modulation index.

    • B. 

      Rate of phase shift.

    • C. 

      Frequency of the modulating signal.

    • D. 

      Amplitude of the modulating signal.

  • 13. 
    What form of modulation is insensitive to signal variations?
    • A. 

      Delta

    • B. 

      Frequency shift keying (FSK)

    • C. 

      Pulse-amplitude modulation (PAM)

    • D. 

      Binary-phaseshift keying or bi-phase shift keying (BPSK)

  • 14. 
    In quadrature-phase shift keying (QPSK) the radio frequency (RF) bandwith for a quadriphase signal is what of that required by a bi-pahse signal, given the same data rate?
    • A. 

      Four times

    • B. 

      Double

    • C. 

      Half

    • D. 

      The same

  • 15. 
    What is the main advantage of differential phase shift keying (DPSK)?
    • A. 

      Carrier presence is required to detect change

    • B. 

      It requires a less complex receiver than a basic phase shift keying (PSK) signal

    • C. 

      It requires a more complex receiver than a basic PSK signal

    • D. 

      The demodulator needds to detect changes in the absolute phase values

  • 16. 
    Which of the following is not considered an analog modulation technique?
    • A. 

      Pulse-amplitude modulation (PAM)

    • B. 

      Pulse-duration modulation (PDM)

    • C. 

      Pulse-positon modulation (PPM)

    • D. 

      Pulse-code modulation (PCM)

  • 17. 
    The form of pulse modulation in which the pulse is varied within a set range of positoins is known as
    • A. 

      Pulse-amplitude modulation (PAM).

    • B. 

      Pulse-duration modulation (PDM).

    • C. 

      Pulse-positon modulation (PPM).

    • D. 

      Pulse-code modulation (PCM).

  • 18. 
    Quanitized analog modulation (QAM) is actually
    • A. 

      Pulse-amplitude modulation (PAM).

    • B. 

      Pulse-duration modulation (PDM).

    • C. 

      Less tolerant of noise than frequency modulation (FM).

    • D. 

      Analog-to-digital conversion

  • 19. 
    How many bits per character of a 16-step pulse-code modulation (PCM) system are used to describe the quantized analog sample?
    • A. 

      3

    • B. 

      4

    • C. 

      5

    • D. 

      8

  • 20. 
    The process of coding pulse code modulation (PCM) quantized pulses to make them a constant duration and amplitude is
    • A. 

      Encoding.

    • B. 

      Companding.

    • C. 

      Uniform quantizing.

    • D. 

      Nonuniform quantizing.

  • 21. 
    In Time Division Multiplexing (TDM), the transmitting multiplexer will put  a bit or byte from each of the incoming lines into a specifically allocated what?
    • A. 

      Channel

    • B. 

      Trunk

    • C. 

      Time slot

    • D. 

      Port

  • 22. 
    The two major types of frame structures are
    • A. 

      Low speed and high speed

    • B. 

      High speed and EBCDIC

    • C. 

      CCITT and low speed

    • D. 

      EBCDIC and CCITT

  • 23. 
    The method of multiplexing the T1 multiplexer uses is
    • A. 

      Frequency division.

    • B. 

      Binary division.

    • C. 

      Pulse division.

    • D. 

      Time division.

  • 24. 
    Wave-division multiplexing (WDM) creates teh virtual channels for multiplexing them together for transmission by using different
    • A. 

      Wavelengths or lambas.

    • B. 

      Wavelengths or gammas.

    • C. 

      Frequencies or lambdas.

    • D. 

      Frequencies or gammas.

  • 25. 
    The most common wave-division multiplexing (WDM) system uses how many wavelengths?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

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