Introduction to Digital Communication Quiz
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Questions and Answers

What is the primary focus of digital modulation in electronic communications?

  • Processing analog signals
  • Varying carrier parameters based on information signal (correct)
  • Transporting information through physical cables
  • Modulating digital microwave signals

Which type of modulation is used when both amplitude and phase are varied proportional to the information signal?

  • FSK
  • QAM (correct)
  • ASK
  • PSK

What does a high information capacity indicate in a communications system?

  • Efficient use of bandwidth (correct)
  • Lack of propagation of information
  • Decreased number of independent symbols
  • Low bandwidth and transmission time

In digital communications, what is a bit rate a measure of?

<p>Number of bits transmitted per second (B)</p> Signup and view all the answers

Which law states that information capacity is directly proportional to bandwidth and transmission time?

<p>Hartley’s Law (C)</p> Signup and view all the answers

What is the Shannon limit for information capacity dependent on in a communications system?

<p>Signal-to-noise power ratio (D)</p> Signup and view all the answers

What does M-ary encoding in digital modulation represent?

<p>Number of conditions or combinations possible for a given number of binary variables (D)</p> Signup and view all the answers

What does the term 'Baud' refer to in digital modulation?

<p>Rate of change of a signal on the transmission medium after encoding and modulation (C)</p> Signup and view all the answers

In digital modulation, what is a signaling element typically represented by?

<p>A symbol encoded as a change in amplitude, frequency, or phase (C)</p> Signup and view all the answers

What does the Nyquist Formula for Channel Capacity state?

<p>The highest theoretical bit rate for a given bandwidth is 2B (C)</p> Signup and view all the answers

How does the capacity to propagate data change when more than two levels are used for signaling in digital modulation?

<p>It is possible to propagate a bit rate exceeding 2B (C)</p> Signup and view all the answers

Which statement about Baud and bits per second relationship in higher-level systems is true?

<p><code>bps</code> is always greater than <code>baud</code> (A)</p> Signup and view all the answers

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