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Two tranformer having same voltage but different KVA are operating in parallel. For a good load sharing __________

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Two tranformer having same voltage but different KVA are operating in parallel. For a good load sharing __________

(a) impedance must be equal

(b) pu impedances must be equal

(c) pu impedance and X/R ratios must be equal

(d) impedance and X/R ratios must be equal

This question was posed to me during an internship interview.

I need to ask this question from Autotransformers topic in division Transformers of Electrical Machines

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Correct answer is (c) pu impedance and X/R ratios must be equal

The best I can explain: Both the conditions are to be met in order to have an efficient operation while in parallel condition.

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