Discussion
The loss summation method of determining efficiency
Answer: A
Correct answer: measures each loss separately and adds them together
Loss summation determines the iron loss, the friction and windage, the copper losses and the stray load loss by separate tests, sums them, and computes the efficiency from the sum. Since each loss is measured directly rather than inferred as a difference, a moderate error in any one has only a small effect on the result.
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