Question

A 250 kW, 400 V, 6-pole dc generator has 720 lap wound conductors. Armature current is ____

(a) 625A

(b) 6.25A

(c) 62.5A

(d) 0.625A

This question was addressed to me by my college director while I was bunking the class.

Question is from Armature Reaction topic in division Armature Reaction of DC Machines

Answer 1

Right choice is (a) 625A

To explain: Armature current multiplied by the armature voltage is called as rating of a DC generator. Thus, 250 kW is the given rating while 400 V is the armature voltage. So, armature current is equal to 250*1000/400 = 625A.