Discussion
For that machine, the armature copper loss is nearest
Answer: D
Correct answer: 3.3 kW
The armature copper loss uses the armature current, not the load current:
\[ P_{cu} = I_a^2R_a = 404^2 \times 0.02 = 163\,216 \times 0.02 \approx 3264 \text{ W} \approx 3.3 \text{ kW} \]This is the variable loss, rising with the square of the current, and it is what the maximum efficiency condition sets against the constant losses.
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