In a transformer, routine efficiency depends upon load current and power factor of load.
Answer : The leakage flux in a transformer depends upon load current.
Description : State why a transformer always have an efficiency of more than 90%.
Answer : As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.
Answer : The efficiency of a power transformer is of the order of 98 percent.
Answer : The maximum efficiency of a distribution transformer is at 50% full load.
Answer : An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.