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Maximum efficiency of a transformer for a constant load current, occurs at __________

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Maximum efficiency of a transformer for a constant load current, occurs at __________

(a) at any p.f

(b) zero p.f leading

(c) zero p.f lagging

(d) unity p.f

This question was addressed to me during an interview for a job.

My question comes from Autotransformers topic in chapter Transformers of Electrical Machines

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Correct option is (d) unity p.f

To explain: Efficiency = KVA*p.f/(KVA*p.f + Losses); So the efficiency is maximum at unity power factor.

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