Question

In a 4 pole machine, what is the flux per pole produced, if the armature length is l and radius is r and Bp is peak value of sinusoidal flux?

(a) 4Bplr

(b) 2Bplr

(c) Bplr

(d) Bplr/2

The question was posed to me during an internship interview.

This interesting question is from Terms Pertaining To Rotating Machines in section Basic Concepts in Rotating Machines of Electrical Machines

Answer 1

Right option is (c) Bplr

To elaborate: Total flux per pole = 4/PBplr, since P=4, Φ=Bplr.