Question: A 6 pole 3-phase wound-rotor induction machine is driven by another machine at 1800 rpm. The rotor of the induction machine is connected to

A 6 pole 3-phase wound-rotor induction machine is driven by another machine

A 6 pole 3-phase wound-rotor induction machine is driven by another machine at 1800 rpm. The rotor of the induction machine is connected to a 50Hz system. If the mechanical rotation of the rotor is in the same direction as the rotor winding flux rotation, then frequency of the stator voltage will be (a) 50Hz (b) 140 Hz (c) 150 Hz (d) 200 Hz

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