Question

What is the formula to calculate the number of turns/phase?

(a) number of turns = secondary voltage * voltage per turn

(b) number of turns = secondary voltage / voltage per turn

(c) number of turns = secondary voltage + voltage per turn

(d) number of turns = secondary voltage – voltage per turn

I had been asked this question in an interview for internship.

Query is from Overall Dimensions in section Design of Transformers of Design of Electrical Machines

Answer 1

Right option is (b) number of turns = secondary voltage / voltage per turn

Explanation: First the voltage across the secondary winding of the transformer is obtained. Next, the voltage across each turn is obtained. On substituting we get the number of turns.