Discussion
A wound rotor induction machine differs from a cage machine in having
Answer: D
Correct answer: a three-phase rotor winding brought out to slip rings
The wound rotor carries a proper three-phase winding whose terminals reach the outside through slip rings, so external resistance may be inserted. That is its whole purpose: resistance in the rotor circuit raises the starting torque and allows some speed control, at the cost of brushes to maintain.
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