Discussion
Which of the following is a DISADVANTAGE of an autotransformer?
Answer: C
An autotransformer has a single winding, part of which is common to the primary and secondary. Its advantages are better voltage regulation, a smaller size and less copper for the same VA rating than a two winding transformer. Its disadvantage is that there is no electrical isolation between the primary and the secondary circuits, so a fault on the high-voltage side can reach the low-voltage side. So the disadvantage is no isolation between the secondary and primary circuit, option (C).
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