A 5 kVA, single-phase, 50 Hz transformer has 50 W iron loss and 150 W full load copper loss. Its efficiency at full load 0.8 p.f lagging will be approximately
1
80%
2
85%
3
75%
4
95%
5
Question Not Attempted
A 5 kVA, single-phase, 50 Hz transformer has 50 W iron loss and 150 W full load copper loss. Its efficiency at full load 0.8 p.f lagging will be approximately