The rotor frequency of a 4 pole, 60 Hz induction motor having full load slip of 5% at rated load is | Induction Motor MCQ#11

The rotor frequency of a 4 pole, 60 Hz induction motor having full load slip of 5% at rated load is:

1. 3 Hz
2. 6 Hz
3. 600 Hz
4. 1200 Hz

Correct answer: 1. 3 Hz

From formula: f_r = sf_e

where f_r = Rotor’s frequency

f_e = 60 Hz

s = slip

f_r = 0.05 * 60 Hz = 3 Hz