For a single phase transformer, wattmeter readings for OC and SC test result are as given below.
Wattmeter reading in OC test - 2.5 KW
Wattmeter reading in SC test - 5 KW
Find maximum efficiency of 5 KVA transformer for unity power factor.
1
70%
2
66.67%
3
33.34%
4
41.38%