A 200/400 V, 20 kVA, and 50 Hz transformer is connected as an autotransformer to transform 600 V to 200 V.
(a) Determine the autotransformer ratio a'.
(b) Determine the kVA rating of the autotransformer.
(c) With a load of 20 kVA, 0.8 pf lagging connected to 200 V terminals, determine the currents in the load and the two transformer windings.