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When the supply frequency of a three phase induction motor is increased, then its synchronous speed is
  • a)
    decreases.
  • b)
    increases.
  • c)
    remain same.
  • d)
    none of the above. 
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
When the supply frequency of a three phase induction motor is increase...
Explanation:

  • When the supply frequency of a three-phase induction motor is increased, the synchronous speed of the motor also increases.

  • The synchronous speed of an induction motor is given by the formula:


    • Synchronous speed = (120 x Frequency) / Number of Poles


  • As we can see from the formula, the synchronous speed is directly proportional to the frequency of the supply.

  • Therefore, when the supply frequency is increased, the synchronous speed of the motor also increases.

  • This means that the motor will run at a higher speed than before, which can be beneficial in some applications.


Therefore, the correct answer is option B - Increases.
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When the supply frequency of a three phase induction motor is increased, then its synchronous speed isa)decreases.b)increases.c)remain same.d)none of the above.Correct answer is option 'B'. Can you explain this answer?
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