A balanced star-connected and purely resistive load is connected at the secondary of a star-delta transformer as shown in figure. The line-to line voltage rating of the transformer is 110 V/200 V. Neglecting the non-idealities of the transformer, the impedance Z of the equivalent star-connected load, referred to the primary side of the transformer, is Ro Yo Bo Ro Yo Bo ww Z ED PAPER - EE (A) (3 + j0) (C) (0.866+0.5) 2 m r Y b 4 ww 34 22 492 mn ELECTRICAL MACHINES (B) (0.866-0.5) 2 (D) (1+0) 2