The synchronous motor is cheaper than 3 phase induction motor for which condition

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The synchronous motor is cheaper than 3 phase induction motor for which condition:

  1. High speed, low output
  2. High speed, High output
  3. Low speed, High output
  4. All of these

Correct answer: 3. Low speed, High output

Explanation: Under the subject conditon the induction motors use large amount of iron so that air flux density doesn’t exceed 0.7 Wb/m2.

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