Question

What happens if the resistance of the end rings is negligible?

(a) resistance coming in each current path is resistance of three bars

(b) resistance coming in each current path is resistance of four bars

(c) resistance coming in each current path is resistance of two bars

(d) resistance coming in each current path is resistance of five bars

The question was asked by my school principal while I was bunking the class.

Query is from Design of End Rings in section Three Phase Induction Motor of Design of Electrical Machines

Answer 1

The correct answer is (c) resistance coming in each current path is resistance of two bars

For explanation I would say: If the resistance of end rings is negligible then the resistance of combined bars are taken into account. Generally the resistance of two bars are taken into account.