Red Seal Electrician Practice
Magnetism and electromagnetismQuestion 205 of 1506

Which core steel gives the lowest hysteresis loss in an AC motor?

  1. Grain-oriented silicon steel
  2. Hard high-carbon alloy steel bar
  3. Hardened solid magnet steel
  4. Plain unlaminated cast iron
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Correct answer: Grain-oriented silicon steel

Soft iron alloys lose less than hard high-carbon steel, and grain-oriented silicon steel loses even less.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.1: Introduction to AC Motors

Practice magnetism and electromagnetism

Questions last reviewed: 18 October 2026