Question

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

(a) 50-100 kVA

(b) 50-150 kVA

(c) 50-200 kVA

(d) 100-200 kVA

The question was asked during an internship interview.

My question is from Window Space Factor in section Design of Transformers of Design of Electrical Machines

Answer 1

Right choice is (c) 50-200 kVA

Easy explanation: 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.