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Network TheoryTwo-Port Networks

A transmission line section represented by ABCD parameters has A=2, B=3 ohm, C=1 siemens and D=2. Is it reciprocal?

  • AYes, because AD-BC=1
  • BNo, because AD-BC=7
  • CYes, because A=D
  • DNo, because B is not equal to C
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Correct Answer: A. Yes, because AD-BC=1
Explanation: For reciprocity, AD-BC must equal 1. Here 2×2-3×1=1, so the network satisfies the reciprocity condition.
Reference: Standard network theory: ABCD reciprocity numerical
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