The efficiency of two identical transformers under load conditions can be determined by_______________?
Correct answer: B. back-to-back test
- A. short-circuit test
- B. back-to-back test
- C. open circuit test
- D. any of the above
Explanation
The back-to-back, or Sumpner, test uses two identical transformers to reproduce full-load conditions while measuring losses, temperature rise, regulation and efficiency. Open-circuit and short-circuit tests mainly determine individual parameters and losses.
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