Quiz On Am And Ssb Modulation

24 Questions | Total Attempts: 2069

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Quiz On Am And Ssb Modulation

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Questions and Answers
  • 1. 
    Having an information signal change some characteristic of a carrier signal is called
    • A. 

      Multiplexing

    • B. 

      Modulation

    • C. 

      Duplexing

    • D. 

      Linear Mixing

  • 2. 
    Which of the following is not true about AM?
    • A. 

      The carrier amplitude varies

    • B. 

      The carrier frequency remains constant

    • C. 

      The carrier frequency changes

    • D. 

      The information signal amplitude changes the carrier amplitude

  • 3. 
    The opposite of modulation is
    • A. 

      Reverse modulation

    • B. 

      Downward modulation

    • C. 

      Unmodulation

    • D. 

      Demodulation

  • 4. 
    The circuit used to produce modulation is called a
    • A. 

      Modulator

    • B. 

      Demodulator

    • C. 

      Variable gain amplifier

    • D. 

      Multiplexer

  • 5. 
    A modulator circuit performs what mathematical operation on its two inputs?
    • A. 

      Multiplication

    • B. 

      Addition

    • C. 

      Division

    • D. 

      Square root

  • 6. 
    The ratio of the peak modulation signal voltage to the peak carrier voltage is referred to as
    • A. 

      The voltage ratio

    • B. 

      Decibels

    • C. 

      The modulation index

    • D. 

      The mix factor

  • 7. 
    If m is greater than 1, what happens?
    • A. 

      Normal operation

    • B. 

      Carrier drops to zero

    • C. 

      Carrier frequency shifts

    • D. 

      Information signal is distorted

  • 8. 
    For ideal AM, which of the following is true?
    • A. 

      M=0

    • B. 

      M=1

    • C. 

      M is greater than 1

    • D. 

      M is lesser than 1

  • 9. 
    The outline of the peaks of a carrier has the shape of the modulating signal and is called the
    • A. 

      Trace

    • B. 

      Waveshape

    • C. 

      Envelope

    • D. 

      Carrier variation

  • 10. 
    The new signals produced by modulation are called
    • A. 

      Spurious emissions

    • B. 

      Harmonics

    • C. 

      Intermodulation products

    • D. 

      Sidebands

  • 11. 
    A display of signal amplitude versus frequency is called the
    • A. 

      Time domain

    • B. 

      Frequency domain

    • C. 

      Amplitude spectrum

    • D. 

      Frequency domain

  • 12. 
    Most of the power in an AM signal is the
    • A. 

      Carrier

    • B. 

      Upper Sideband

    • C. 

      Lower Sideband

    • D. 

      Modulating Signal

  • 13. 
    For 100 percent modulation, what percentage of power is in each sideband?
    • A. 

      25 percent

    • B. 

      33.3 percent

    • C. 

      50 percent

    • D. 

      100 percent

  • 14. 
    An AM transmitter has a percentage of modulation of 88. The carrier power is 440W. The power in one sideband is
    • A. 

      85W

    • B. 

      110W

    • C. 

      170W

    • D. 

      610W

  • 15. 
    In an AM signal, the transmitted information is contained within the
    • A. 

      Carrier

    • B. 

      Modulating Signal

    • C. 

      Sidebands

    • D. 

      Envelope

  • 16. 
    An AM signal without the carrier is called a(n)
    • A. 

      SSB

    • B. 

      Vestigial Sideband

    • C. 

      FM signal

    • D. 

      DSB

  • 17. 
    What is the minimum AM signal needed to transmit information?
    • A. 

      Carrier plus sidebands

    • B. 

      Carrier only

    • C. 

      One sideband

    • D. 

      Both sideband

  • 18. 
    The main advantage of SSB over standard AM or DSB is
    • A. 

      Less spectrum space is used

    • B. 

      Simpler equipment is used

    • C. 

      Less power is consumed

    • D. 

      A higher modulation percentage

  • 19. 
    In SSB, which sideband is the best to use?
    • A. 

      Upper

    • B. 

      Lower

    • C. 

      Neither

    • D. 

      Depends upon the use

  • 20. 
    The typical audio modulating frequency range used in radio and telephone communications is
    • A. 

      50 Hz to 5 KHz

    • B. 

      50 Hz to 15 KHz

    • C. 

      100 Hz to 10 KHz

    • D. 

      300 Hz to 3 KHz

  • 21. 
    Distortion of the modulating signal produces harmonics which cause an increase in the signal
    • A. 

      Carrier power

    • B. 

      Bandwidth

    • C. 

      Sideband power

    • D. 

      Envelope voltage

  • 22. 
    The process of translating a signal,with or without modulation, to a higher or lower frequency for processing is called
    • A. 

      Frequency multiplication

    • B. 

      Frequency division

    • C. 

      Frequency shift

    • D. 

      Frequency conversion

  • 23. 
    Frequency translation is carried out by a circuit called a
    • A. 

      Translator

    • B. 

      Converter

    • C. 

      Balanced Modulator

    • D. 

      Local Oscillator

  • 24. 
    The output power of an SSB transmitter is usually expressed in terms of
    • A. 

      Average power

    • B. 

      RMS power

    • C. 

      Peak to peak power

    • D. 

      Peak envelope power

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