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Answer Posted / parth belani
The efficiency can be found by finding the losses. because,
efficiency= output/input = output/(output+losses)
Now there are mainly two types of losses in a transformer.
1) Iron losses which can be found by the "No load" test.
2) Copper losses which can be found by the "Full load"
or "Short Circuit" test.
by knowing the losses, and the output rating of the
transformer, we can find efficiency.
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