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In a transformer, routine efficiency depends upon load current and power factor of load.

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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.

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