20. A transformer has its maximum efficiency of 0.98 at 15 kVA at unity p.f. During a day, it is loaded as follows : 12

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answerhappygod
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20. A transformer has its maximum efficiency of 0.98 at 15 kVA at unity p.f. During a day, it is loaded as follows : 12

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20. A transformer has its maximum efficiency of 0.98 at 15 kVA at unity p.f.
During a day, it is loaded as follows :
12 hours : 2 kW at 0.8 p.f.
6 hours : 12 kW at 0.8 p.f.
6 hours : 18 kW at 0.9 p.f.
Find the all day efficiency.
Use two decimal places for final answer
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