Red Seal Electrician Practice
MotorsQuestion 1259 of 1506

Which NEMA design is the default motor for most applications such as pumps, fans and machine tools?

  1. Class A
  2. Class C
  3. Class B
  4. Class D
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Correct answer: Class B

Class B starts most loads with moderate starting current and has high efficiency and power factor.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.7: Tesla Polyphase Induction Motors

Practice motors

Questions last reviewed: 18 October 2026