Question:hard

The current flowing through the armature of a d.c. shunt machine at maximum efficiency is given by :

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To easily remember maximum efficiency conditions for any electrical machine:
Set Copper Loss (\(I^2 R\)) = Constant Loss (\(P_i\)).
Solve for Current: \(I = \sqrt{\frac{P_i}{R}}\).
  • \(\sqrt{(P_i / R_a)}\)
  • \(\sqrt{(R_a / P_i)}\)
  • \(\sqrt{(P_i / R_a^2)}\)
  • \(\sqrt{(R_a / P_i^2)}\)
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The Correct Option is A

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