Open circuit and short circuit tests conducted on a 10 kVA 2000 V/200 V, 50Hz single-phase transformer gave the following readings.
OC test: 200 V, 1.1 A, 81 W
SC test: 30 V, 5 A, 100 W
At what fraction of full load will the transformer operate at maximum efficiency?
1
0.9
2
0.8
3
0.6
4
0.7