3D152 Volume 1

69 Questions | Total Attempts: 688

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3D152 Quizzes & Trivia

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 Contiuously Variable Slop Delta (CVSD) Modulation

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

      Delta Modulation

    • 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 Modulatiion

    • D. 

      Adaptive Modultaion

  • 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 bandwidth that is
    • A. 

      Twice that of the modulation 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) modulqation is eliminated by
    • A. 

      Filtering

    • B. 

      Detection

    • C. 

      Comperssion

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

      Transmitted intelligence

    • B. 

      Intensity of speech

    • C. 

      Composite Waves

    • D. 

      Splatter

  • 11. 
    The amount of deviation in a frequency modulation (FM) signal is directly proportioanl to
    • A. 

      Phase

    • B. 

      Amplitude

    • C. 

      Frequency

    • D. 

      Amplitude and frequency

  • 12. 
    The amount of 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 singal

  • 13. 
    What form is 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)

  • 14. 
    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

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

      Carrier presence is required to detect changes

    • B. 

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

    • C. 

      It requires a more complex reciever than a basic PSK signal

    • D. 

      The demodulator needs to detect changes in absolute phase values

  • 16. 
    What 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)

  • 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 tlerant 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 anoalog 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. 

      Frequncy division

    • B. 

      Binary division

    • C. 

      Pulse division

    • D. 

      Time division

  • 24. 
    Wave-divison multiplexing (WDM) creeates the virtual channels for multiplexing them together for transmission by using different
    • A. 

      Wavelenghts 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 wavelength

    • C. 

      Three wavelength

    • D. 

      Four wavelength