(Solved): An eight-pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 r .p.m. by a p ...

An eight-pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 r .p.m. by a prime mover in the opposite direction of revolving magnetic field. The frequency of rotor current is (a) 60 Hz (b) 120 Hz (c) 180 Hz (d) none of the above.