What is the ratings of the transformers for using the empirical value of window space factor?

What is the ratings of the transformers for using the empirical value of window space factor? Correct Answer 50-200 kVA

The empirical formula of the window space factor is used for the transformers of the rating 50-200 kVA. If the transformer rating is higher than 200 kVA then the empirical formula isn’t used.
Bissoy MCQ

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