Which of the following are variable losses

Electrical Engineering XYZ MCQs

Which of the following are variable losses:

  1. Armature copper loss
  2. Eddy current loss
  3. Hysteresis loss
  4. Shunt field copper loss

Correct answer: 1. Armature copper loss

Explanation: Armature copper loss is a variable loss because it is dependent on the armature current, which can vary with the load on the motor or generator. The armature copper loss can be calculated using the formula 𝑃cu=πΌπ‘Ž2π‘…π‘Žβ€‹, where Ia​ is the armature current and Ra​ is the resistance of the armature windings. As the load varies, the armature current varies, hence the armature copper loss varies accordingly.

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