Question no$.2$

A $3-$phase $50Hz,8$ pole, $2$ kW slip ring induction motor drives a constant load torque.

The per phase rotor resistance is $0\mathrm{.}06$ and rotor leakage reactance is $0\mathrm{.}3.$

The motor runs at a speed of $700$ rpm $.$

What resistance should be added in rotor circuit to reduce the motor speed to $500$ rpm with the same load torque.

What resistance should be added in rotor circuit to have maximum torque at starting.