Arc in a circuit behaves as

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Electrical Engineering MCQ on Power System Protection

Arc in a circuit behaves as

  1. A capacitive reactance
  2. A resistance decreasing with voltage rise across the arc
  3. A resistance increasing with voltage rise across the arc
  4. An inductive reactance

Correct answer: 2. A resistance decreasing with voltage rise across the arc

About Circuit breakers

Circuit breakers are the “final control elements” of the electric power industry, akin to control valves in the process industries. They are strictly on/off devices, used to make and break connections under load in power systems. Circuit breakers automatically open when dangerous circuit conditions are detected. Continue reading here

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