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Question

The efficiency of a transformer is 90%. The maximum loss has occured in
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A
resistance of primary and secondary coils
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B
eddy current
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C
hysteresis loss
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D
magnetostriction loss.
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Solution

The correct option is C resistance of primary and secondary coils
losses consist of I2R losses in the primary and secondary windings, and hysteresis and eddy-current losses in core.
Hysteresis losses are minimized by the use of iron having a narrow hysteresis loop; and eddy currents are minimized by laminating the core; nothing much can be done about the I2R, other than using wires of low resistivity.
Maximum losses occurs as the I2R losses compared to the hysteresis and eddy currents loss which are controlled by the mentioned ways.

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