Question

What is the permissible current density in the armature conductors?

(a) 3-4 A per mm^2

(b) 3-6 A per mm^2

(c) 4-6 A per mm^2

(d) 3-5 A per mm^2

The question was posed to me during an interview for a job.

My enquiry is from Armature Design in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct answer is (d) 3-5 A per mm^2

To explain I would say: The minimum permissible value of the current density in the armature conductors is 3 A per mm^2. The maximum allowed value of the current density in the armature conductors is 6 A per mm^2.