Discussion
Consider the following statements about efficiency.
1. Maximum efficiency occurs when copper loss equals iron loss.
2. Iron loss is nearly constant with load.
3. Copper loss is nearly constant with load.
Which are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: maximum efficiency occurs where copper loss equals iron loss, and iron loss is nearly constant because the flux is fixed by the applied voltage. Statement 3 is wrong - copper loss varies as the square of the load current, which is precisely the variation that makes the efficiency curve peak where it does.
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