A 200/400 V, 20 kVA, 50Hz transformer is connected as an auto-transformer to work off 600/200 supplies with a load of 20 kVA, 0.8 PF lagging connected to the 200 V terminals. Find the current in common winding and KVA rating of auto transformer respectively.
1
33.33 A, 20
2
33.33 A, 30
3
66.66A, 30
4
66.66A, 20