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Three Phase Induction Motors MCQs with Explanatory Answers

Three Phase Induction Motors MCQs with Explanatory Answers

1. If the frequency of 3-phase supply to the stator of 3-phase induction motor is increased, then synchronous speed is ________?
  1. Increased
  2. Decreased
  3. Remain unchanged
  4. None of the above

Show Explanatory Answer

Answer:        1.           Increased
Explanation:   As we know that;   f = NSP/ 120
It is clear that f ∝ NS i.e., frequency (f) is directly proportional to the Synchronous speed (NS).
In more clear words, when frequency increases, Speed also increases.


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