Question

What is the ratio of the net core area to the area of the circumscribing circle in square cores?

(a) 0.58

(b) 0.64

(c) 0.70

(d) 0.80

This question was addressed to me during an interview for a job.

The above asked question is from Design of Core and Winding topic in division Design of Transformers of Design of Electrical Machines

Answer 1

The correct answer is (a) 0.58

For explanation: 0.64 is the ratio of the gross core area to the area of the circumscribing circle. Net core area is the product of stacking factor and gross iron area.