Machine-translated by Google. Questions are authored in English.
Top

Discussion

Frequency control of an induction motor changes the

  • A.synchronous speed of the rotating field
  • B.slip at which the machine develops its maximum torque only
  • C.rotor resistance of the machine and hence its characteristic
  • D.number of poles for which the stator is wound

Answer: A

Since the synchronous speed is proportional to frequency, lowering the frequency lowers the whole characteristic without increasing the slip. That is what makes it an efficient method, unlike voltage or resistance control.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.