q a transformer has its maximum efficiency of, Electrical Engineering

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q a transformer has its maximum efficiency of

Q. A transformer has its maximum efficiency of 0.9800 when it delivers 15 kVA at unity power factor. During the day it is loaded as follows:

12 hours 2 kW at power factor 0.5

6 hours 12 kW at power factor 0.8

6 hours 18 kW at power factor 0.9

Determine the all-day efficiency.

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