A 6-pole, 50 Hz, 3-phase synchronous motor and on 8-pole,
50 Hz, 3-phase slip-ring induction motor are mechanically
coupled and operate on the same 3-phase, 50 Hz supply. If
they are left open-circuited, then the frequency of the
voltage produced across any two slip rings would be
Answer Posted / kannan
50 HZ
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