Question

What is window space factor?

(a) window space factor = copper area in the window – total window area

(b) window space factor = copper area in the window + total window area

(c) window space factor = copper area in the window * total window area

(d) window space factor = copper area in the window / total window area

I had been asked this question in final exam.

Question is taken from Window Space Factor topic in section Design of Transformers of Design of Electrical Machines

Answer 1

Right choice is (d) window space factor = copper area in the window / total window area

For explanation: Window space factor is the ratio of the copper area in the window to the total window area. It is a constant used in the output equation of transformers.