Discussion
The chief limitation of Swinburne's test is that it
Answer: C
Correct answer: does not check the machine’s behaviour under load
Swinburne’s test measures the no-load losses and the resistances and computes the efficiency at any load from them, so it is cheap and needs very little power. But the machine never carries load during the test, so nothing is learnt about commutation at load, about temperature rise, or about the effect of armature reaction. A regenerative or Hopkinson test, which loads two identical machines against each other, answers those questions at the cost of needing a matched pair.
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