If per phase rotor resistance and reactance of a 3-ϕ slip ring induction motor at standstill and 0.02 Ω and 0.2 Ω respectively then to obtain maximum starting torque, the external resistance to be connected in each phase of rotor is:
1
0.22 Ω
2
0.18 Ω
3
100 Ω
4
0.20 Ω
5
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