Discussion
The efficiency of the two identical transformers under load conditions can be determined by:
Answer: A
The efficiency of two identical transformers on load is found by the Back to back test.
In the back to back (Sumpner's) test the primaries of the two transformers are connected in parallel across the supply and the secondaries in series opposition. One wattmeter reads the core loss of both at rated voltage, and a second supply circulates full-load current to give the copper loss of both, so the transformers run at full load while drawing only their losses.
The open circuit and short circuit tests each give one kind of loss, and neither loads the transformer under actual working conditions, so 'Any of the above' is also wrong.
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