A 20 kW, 500 V shunt motor has an efficiency of 90% at full load. The armature copperloss is 40% of the full-load loss. The field resistance is 250 Ω. Calculate the resistance values of a 4-section starter suitable for this motor in the following two cases:
![1565_5fa11385-02bc-4a7d-a0f5-b92794775efb.png](https://secure.tutorsglobe.com/CMSImages/1565_5fa11385-02bc-4a7d-a0f5-b92794775efb.png)