The supply frequency of a 4 pole induction motor having a synchronous speed of 1800 RPM is

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The supply frequency of a 4 pole induction motor having a synchronous speed of 1800 RPM is:

  1. 50 Hz
  2. 60 Hz
  3. 120 Hz
  4. 240 Hz

Correct answer: 2. 60 Hz.

Explanation: The basic formula for Synchronous Speed of machines is:

synchronous-speed-formula

From this we obtain:
f = P * Speed / 120 = 4 * 1800 / 120 = 60 Hz

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