Red Seal Electrician Practice
MotorsQuestion 1294 of 1506

Why does a capacitor-start motor suit an air conditioning compressor?

  1. It has no switch that can fail in service on the motor.
  2. It only runs on three-phase power from the supply.
  3. It has a very low full load current when running
  4. It gives more starting torque for heavy loads.
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Correct answer: It gives more starting torque for heavy loads.

A larger start capacitor and heavier auxiliary winding make high starting torque.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.9: Single-phase Induction Motors

Practice motors

Questions last reviewed: 18 October 2026