What is the all day efficiency of the transformer

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Reference no: EM13259623

A 25KVA transformer supplies a load with the following schedule:
8hrs-full load with 0.8 lagging power factor.
4hrs-75% full load at unity power factor.
12hrs-No load.
The transformer is energised 24hrs per day and has iron losses of350w.
The transformer has maximum efficiency at 60% full load.
With info given what is the all day efficiency of this transformer?

Reference no: EM13259623

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