Formula for Synchronous Speed of Induction Machine: Induction Motor MCQ#4

The correct formula for Synchronous Speed of Induction Machine:

  1. ηsync= 240*f /P
  2. ηsync= 120*f /P
  3. ηsync= 120/(f*P)
  4. ηsync= 120*f /3P

Correct answer: 2. ηsync= 120*f /P

The sychronous speed or speed of rotation of magnetic fields can be mathematically expressed by the following relationship:

ηsync= 120*f /P

where

f = frequency

P = Number of poles

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