Question

What is the formula for the resistance of running winding?

(a) resistance of running winding = 0.021 * no of turns in running winding * length of mean turns of running winding * area of running winding conductor

(b) resistance of running winding = 0.021 / no of turns in running winding * length of mean turns of running winding * area of running winding conductor

(c) resistance of running winding = 0.021 * no of turns in running winding / length of mean turns of running winding * area of running winding conductor

(d) resistance of running winding = 0.021 * no of turns in running winding * length of mean turns of running winding / area of running winding conductor

I got this question in my homework.

Query is from Parameters in division Design of Single Phase Induction Motor of Design of Electrical Machines

Answer 1

Right answer is (d) resistance of running winding = 0.021 * no of turns in running winding * length of mean turns of running winding / area of running winding conductor

Easy explanation: First the no of turns in running winding along with length of mean turns of running winding and area of running winding conductor is calculated. On substitution the resistance of running winding is calculated.