Discussion
As compared to conventional two-winding transformers, in case of an autotransformer, the voltage regulation is ______ and the efficiency is ______.
Answer: B
An autotransformer has part of its winding common to the primary and the secondary, so it needs less copper and has lower winding resistance and leakage reactance. Lower resistance and reactance mean a smaller voltage drop under load, so the voltage regulation is better, and lower copper loss means the efficiency is higher than that of a two winding transformer of the same rating.
The options with poor regulation or less efficiency state the opposite of the effect. The answer is better regulation and more efficiency, option B.
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