3D152 Volume 1 UREs

69 Questions | Total Attempts: 380

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3D152 Volume 1 UREs

3D152 Volume 1 UREs


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

      Amplitude modulation (AM) and frequency modulation (FM).

    • B. 

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

    • C. 

      Phase modulation (PM) and quadrature phase shift keying (QPSK).

    • D. 

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

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

      Delta modulation (DM).

    • B. 

      Digital modulation.

    • C. 

      Analog modulation.

    • D. 

      Adaptive modulation.

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

      Delta modulation (DM).

    • B. 

      Analog modulation.

    • C. 

      Digital 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 frequencies.

  • 5. 
    Amplitude modulation (AM) requires a bandwidth 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 carrier 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) modulation over conventional amplitude modulation (AM) as
    • A. 

      2 decibels (dB) of improvement.

    • B. 

      4 dB of improvement.

    • C. 

      6 dB of improvement.

    • D. 

      8 dB 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 frequency is a description of
    • A. 

      A phase modulation (PM).

    • B. 

      A pulse modulation.

    • C. 

      A frequency modulation (FM).

    • D. 

      An amplitude modulation (AM).

  • 10. 
    The amount of deviation in a frequency modulation (FM) signal is directly proportional to the modulating signal’s
    • A. 

      Phase.

    • B. 

      Amplitude.

    • C. 

      Frequency.

    • D. 

      Amplitude and frequency.

  • 11. 
    If 100 percent modulation is exceeded and there is distortion in the modulating signal, additional sidebands are generated. We identify these sidebands as what?
    • A. 

      Transmitted intelligence.

    • B. 

      Intensity of speech.

    • C. 

      Composite waves.

    • D. 

      Splatter.

  • 12. 
    What is the main advantage of differential phase shift keying (DPSK)?
    • A. 

      Carrier presence is required to detect changes.

    • 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 needs to detect changes in absolute phase values.

  • 13. 
    Which of the following is not considered an analog modulation techniques?
    • A. 

      Pulse-amplitude modulation (PAM).

    • B. 

      Pulse-duration modulation (PDM).

    • C. 

      Pulse-position modulation (PPM).

    • D. 

      Pulse-code modulation (PCM).

  • 14. 
    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.

  • 15. 
    What form of modulation is insensitive to signal variations?
    • A. 

      Delta.

    • B. 

      Frequency shift keying (FSK).

    • C. 

      Pulse-amplitude modulation (PAM).

    • D. 

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

  • 16. 
    In quadrature-phase shift keying (QPSK) the radio frequency (RF) bandwidth for a quadriphase signal is what of that required by a bi-phase signal, given the same data rate.
    • A. 

      Four times.

    • B. 

      Double.

    • C. 

      Half.

    • D. 

      The same.

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

      Pulse-amplitude modulation (PAM).

    • B. 

      Pulse-duration modulation (PDM).

    • C. 

      Pulse-position modulation (PPM).

    • D. 

      Pulse-code modulation (PCM).

  • 18. 
    Quantized analog modulation 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 a 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 the virtual channels for multiplexing them together for transmission by using different
    • A. 

      Wavelengths or lambdas.

    • 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. 

      One wavelength.

    • B. 

      Two wavelengths.

    • C. 

      Three wavelengths.

    • D. 

      Four wavelengths.