Question

Peak flux density in terms of total flux density is given by _________

(a) ATa (peak) = ATa (total) /P

(b) ATa (peak) = ATa (total) *P

(c) ATa (peak) = ATa (total) /P*P

(d) ATa (peak) = ATa (total) *P^2

This question was addressed to me in a national level competition.

Query is from Armature Reaction -1 topic in section Armature Reaction of DC Machines

Answer 1

The correct answer is (a) ATa (peak) = ATa (total) /P

To elaborate: Peak flux density is defined as ratio of total flux density given to the number of poles for a given DC machine. Peak flux density in terms of total flux density is given by ATa (peak) = ATa (total) /P.