Ground Wire and Signal Wires Quiz
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Questions and Answers

What is a primary disadvantage of unbalanced transmission lines?

  • More complicated installation process
  • Reduced immunity to common-mode signals (correct)
  • Higher cost compared to balanced lines
  • Lower data transfer rates

    • Why does a small potential difference exist between any two points on the ground wire?

  • Improper grounding techniques
  • Presence of transformers
  • High frequency signals
  • Resistance, inductance, and capacitance of the wire (correct)

    • Which type of transmission line requires only one ground line no matter how many signals are grouped into one conductor?

  • Twisted pair transmission lines
  • Unbalanced transmission lines (correct)
  • Balanced transmission lines
  • Coaxial transmission lines

    • What circuit device is used to connect a balanced transmission line to an unbalanced load?

    <p>Balun</p> Signup and view all the answers

    How can an unbalanced coaxial transmission line be connected to a balanced load like an antenna?

    <p>Using a transformer with an unbalanced primary and center-tapped secondary winding</p> Signup and view all the answers

    What is the primary advantage of unbalanced transmission lines over balanced ones?

    <p>Requiring only one wire for each signal</p> Signup and view all the answers

    In a balanced wire pair, common-mode interference induces noise equally in both wires, resulting in:

    <p>Longitudinal currents that cancel in the load</p> Signup and view all the answers

    What is the term used to describe the cancellation of common-mode signals in a balanced transmission line?

    <p>Common-mode rejection</p> Signup and view all the answers

    What is a key requirement for a pair of wires to operate in balanced mode?

    <p>Neither wire is at ground potential</p> Signup and view all the answers

    What is the primary difference between a balanced transmission line and an unbalanced transmission line?

    <p>Ground potential of one wire</p> Signup and view all the answers

    Why is the shield of a coaxial cable connected to ground?

    <p>To prevent static interference from reaching the center conductor</p> Signup and view all the answers

    What does the term 'single-ended signal transmission' refer to?

    <p>One wire is at ground potential while the other carries the signal</p> Signup and view all the answers

    What is the main difference between balanced and unbalanced transmission lines?

    <p>Balanced lines have both conductors carrying current in opposite directions, while unbalanced lines have only one conductor carrying current.</p> Signup and view all the answers

    In a balanced transmission line system, how are the signal currents distributed?

    <p>Equal in magnitude with respect to electrical ground and flow in opposite directions.</p> Signup and view all the answers

    What defines differential (balanced) signal transmission on a two-wire balanced line?

    <p>The potential difference between the two wires carrying the signal.</p> Signup and view all the answers

    Why are balanced transmission lines less susceptible to external interference compared to unbalanced lines?

    <p>Because balanced lines have metallic circuit currents flowing in opposite directions cancelling out external noise better.</p> Signup and view all the answers

    What characteristic of a transverse wave indicates the displacement and velocity as it propagates down a transmission line?

    <p>Differential signal</p> Signup and view all the answers

    When measuring voltage in a balanced transmission line, why does it fluctuate from zero to maximum positive, back to zero, and then to maximum negative?

    <p>Due to the alternating signal propagation between the two wires carrying potential difference.</p> Signup and view all the answers

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