Question

What is the dimension of the round copper wire made use of in the windings of current transformer?

(a) 3 cm^2

(b) 3 mm^2

(c) 3 m^2

(d) 3 cm

This question was posed to me during an online interview.

This is a very interesting question from Turns Compensation topic in section Design of Current Transformers (CT) of Design of Electrical Machines

Answer 1

Right answer is (b) 3 mm^2

For explanation I would say: Copper strip is used for primary windings. The dimension of the round copper wire made use of in the windings of current transformer is 3 mm^2.