Find the all-day efficiency of the transformer

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Reference no: EM131266935

A transformer has its maximum efficiency of 0.98 at 20-kVA at unity power factor. During the day it is loaded as follows:

12 hours; 2 kW at power factor 0.6

6 hours; 10 kW at power factor 0.8

6 hours; 20 kW at power factor 0.9

Find the ‘all-day' efficiency of the transformer.

Reference no: EM131266935

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