Discussion
The two tests together allow the efficiency of a transformer to be computed without
Answer: D
Correct answer: supplying its full output power
This is the practical value of the two tests. Each draws only a small fraction of rated power - the open circuit test rated voltage at no-load current, the short circuit test rated current at a few per cent of voltage - yet between them they give both loss components, from which the efficiency at any load can be computed. Loading a large transformer to full output for a test would be impractical.
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