Answer / r g sabnis

Well, the slip rings are used in AC ( Crane duty Motors )

to add extrenal resistance to increse starting torque.

DC motors are with different construction. A commutator is
used to supply DC to armature.

Answer / dj

Actualy for better torque in induction motor we should have high resistance and low inductance but in induction motor we have coil which have high inductance so we give high resistance from rheostat to rotor. And we use slip ring because it is use for rotating device only in ac motor

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