Red Seal Electrician Practice
Motor controlsQuestion 1233 of 1506

Why is a servo motor system more costly and complex than a stepper system?

  1. It needs a centrifugal switch and a start capacitor.
  2. It needs slip rings and a resistor bank.
  3. It needs a position sensor and an error amplifier for feedback.
  4. It needs a three-phase transformer.
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Correct answer: It needs a position sensor and an error amplifier for feedback.

The extra feedback parts add cost. A stepper drive is only on and off switches.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.5: Stepper Motors

Practice motor controls

Questions last reviewed: 18 October 2026