Question

What is the formula of the resistance of the winding is calculated at 75°C?

(a) resistance of the winding = (Number of field turns * pole proportion * length of mean turns of the coil) / area of the field conductors

(b) resistance of the winding = (Number of field turns * pole proportion * length of mean turns of the coil) * area of the field conductors

(c) resistance of the winding = (Number of field turns / pole proportion * length of mean turns of the coil) / area of the field conductors

(d) resistance of the winding = (Number of field turns * pole proportion / length of mean turns of the coil) / area of the field conductors

The question was posed to me in an interview for job.

I want to ask this question from Design of Field Winding topic in portion Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right option is (a) resistance of the winding = (Number of field turns * pole proportion * length of mean turns of the coil) / area of the field conductors

To elaborate: The number of field turns is calculated along with the pole proportion. The length of mean turns of the coil and the area of the field conductors is calculated and on substituting the values the resistance of the winding is obtained.