The open circuit and short circuit tests on a transformer give the following losses. At what load will the efficiency of the transformer be maximum?
1
At load of 40 kVA - Loss on OC test: 320 W and Loss on SC test: 320 W
2
At load of 50 kVA - Loss on OC test: 320 W and Loss on SC test: 80 W
3
At load of 30 kVA - Loss on OC test: 320 W and Loss on SC test: 180 W
4
At load of 50 kVA - Loss on OC test: 320 W and Loss on SC test: 500 W