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A 4 pole, 60 Hz Induction Motor Has a Slip of 5%. The Speed of motor is | Induction Motor MCQ#7

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A 4 pole, 60 Hz Induction Motor Has a Slip of 5%. The Speed of motor is:

  1. 1710 RPM
  2. 1800 RPM
  3. 1894 RPM
  4. 2245 RPM

Correct answer: 1. 1710 RPM

The basic formula for formula for Synchronous Speed of Induction Machine is: ηsync= 120*f /P

ηsync= 120*f /P = 120 * 60/4 = 1800 RPM

ηm = (1-s) * ηsync

Here s = 0.05

ηm = (1 – 0.05) * 1800 = 0.95 * 1800 = 1710 RPM

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