Red Seal Electrician Practice
Power factor and three-phaseQuestion 1216 of 1506

What is a synchronous condenser?

  1. A capacitor bank that is switched in steps by a synchronous relay
  2. A synchronous motor run at full load to correct the frequency
  3. A transformer that raises the line voltage during a sag
  4. A synchronous motor with no shaft load and an over-excited field
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Correct answer: A synchronous motor with no shaft load and an over-excited field

With no mechanical load it only exchanges reactive power with the line.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.3: Synchronous Condenser

Practice power factor and three-phase

Questions last reviewed: 18 October 2026