Discussion
A 3-phase induction motor has supply frequency of 60 Hz. When the rotor is stationary, the frequency of rotor current is _______.
Answer: C
The frequency of the rotor current is 60 Hz. The rotor frequency is the slip times the supply frequency, and when the rotor is stationary the slip is 1.
\[ f_r = s f = 1 \times 60 = 60\ \text{Hz} \]
The value 0 Hz would be for a rotor running at synchronous speed, where the slip is zero, 30 Hz would be for a slip of 0.5, and 120 Hz would be for a slip of 2. So the third option is correct.
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