Question

For a p-pole machine, which of the following statements are correct regarding the rotating field speed?

(a) The rotating field speed is 1/(p/2) revolutions in one cycle

(b) f/(p/2) revolutions in f cycles

(c) f/(p/2) revolutions in one second

(d) Any of the mentioned

This question was posed to me in an international level competition.

The doubt is from Rotating Magnetic Field in division Basic Concepts in Rotating Machines of Electrical Machines

Answer 1

Right answer is (d) Any of the mentioned

Explanation: f/(p/2) revolutions in one second is also correct because f cycles are completed in one second. ns(rotating field speed in revolutions per second) = 2f/p or Ns = 120f/p r.p.m.