Question

For the given circuit below, the voltage across the terminal ‘a’ and ‘b’ is?

(a) 1.73*V

(b) V/1.73

(c) V

(d) 3*V

I had been asked this question by my college professor while I was bunking the class.

My question is based upon Three Phase Transformers in section Transformers of Electrical Machines

Answer 1

Correct choice is (a) 1.73*V

The explanation is: From delta  to star,  the voltage between the lines will increase by 1.73.