Discussion
A 2000/200 V, 20 kVA is connected as an autotransformer. What are the ratings of primary and secondary voltages of the autotransformer?
Answer: A
A two winding transformer of 2000/200 V has a high voltage winding of 2000 V and a low voltage winding of 200 V. If the two windings are joined in series so that their voltages add (additive connection), the autotransformer has a primary of 2000 V and a secondary of \(2000 + 200 = 2200\) V, which is the step up connection in option A.
The same two windings can also be connected to subtract, giving 1800 V, but that is not listed. The value 1500 V and 220 V do not arise from any series connection of the two windings, and 200 V is just the low voltage winding on its own, not an autotransformer rating. The answer is option A.
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