Discussion
The saving in copper in an autotransformer compared with a two-winding transformer of the same rating is greatest when the ratio is
Answer: D
The saving is \( 1 - 1/k \) of the copper for a ratio \( k \), so a ratio of 1.1 saves nearly everything and a ratio of ten saves little. That is why autotransformers are used for modest voltage adjustments and starting duty.
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