Question

What is utilization factor?

(a) utilization factor= cross sectional area + gross area of the core

(b) utilization factor= cross sectional area – gross area of the core

(c) utilization factor= cross sectional area * gross area of the core

(d) utilization factor= cross sectional area / gross area of the core

I had been asked this question during a job interview.

Question is from Design of Core and Winding topic in section Design of Transformers of Design of Electrical Machines

Answer 1

Right choice is (d) utilization factor= cross sectional area / gross area of the core

The explanation: The utilization factor is equal to the ratio of the cross sectional area to the gross area of the core. The cross sectional area and the gross area of the core are first found out, and the ratio gives utilization factor.