Current flowing through armature of d.c. shunt machine at maximum efficiency

Q.  The current flowing through the armature of a d.c. shunt machine at maximum efficiency is given by
- Published on 19 Oct 15

a. √(Pi / Ra)
b. √(Ra / Pi)
c. √(Pi / R2a)
d. √(Ra / P2i)

ANSWER: √(Pi / Ra)

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