For the parallel operation of single phase transformers it is necessary that they should have___________?
Correct answer: B. same polarity
- A. same efficiency
- B. same polarity
- C. same kVA rating
- D. same number of turns on the secondary side.
Explanation
Transformers connected in parallel must have the same polarity so their secondary induced voltages aid rather than oppose each other. Equal efficiency, kVA rating or turns are not essential requirements, although compatible voltage ratios and impedances are needed.
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