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A single-phase 10 kVA, 460/120 V, 60 Hz, transformer has an efficiency of 96% when it...

  1. A single-phase 10 kVA, 460/120 V, 60 Hz, transformer has an efficiency of 96% when it delivers 9 kW at 0.9 pf lagging. The transformer is connected as an autotransformer to supply load to a 460 V circuit from a 580 V source.
  1. Show the autotransformer connection
  2. Determine kVA rating of the autotransformer
  3. Determine the efficiency of the autotransformer at full-load with 0.9 pf lagging
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