Question

What is the range of the permissible values of the flux densities in pole body?

(a) 1.4-1.7 Wb per m^2

(b) 1.5-1.7 Wb per m^2

(c) 1.4-1.6 Wb per m^2

(d) 1.5-1.6 Wb per m^2

This question was addressed to me at a job interview.

I would like to ask this question from Design of Rotor topic in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right answer is (b) 1.5-1.7 Wb per m^2

To explain: The minimum value of the flux density in the pole body is given to be 1.5 Wb per m^2.The maximum permissible value of the flux density in the pole body is given to be 1.7 Wb per m^2.