Discussion
Voltage regulation of a transformer is
Answer: D
Correct answer: the fall in secondary voltage from no load to full load
Regulation measures how much the secondary voltage sags when load is applied, expressed as a fraction of the no-load value. It is caused by the voltage dropped across the winding resistance and, more importantly, the leakage reactance. A low regulation means a stiff supply, which is why distribution transformers are designed for a few per cent.
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