Question

What is the range of the ratio of the total cross section of rotor bars to the total stator copper section for main winding for aluminium?

(a) 1-1.3

(b) 1-1.4

(c) 1-1.6

(d) 1.2-1.5

The question was asked at a job interview.

This interesting question is from Design of Rotor in portion Design of Single Phase Induction Motor of Design of Electrical Machines

Answer 1

The correct answer is (c) 1-1.6

The best explanation: The minimum value of range of the ratio of the total cross section of rotor bars to the total stator copper section for main winding is 1. The maximum value range of the ratio of the total cross section of rotor bars to the total stator copper section for main winding is 1.6.