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Hopkinson’s test of D.C. machines is conducted at _______________

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Hopkinson’s test of D.C. machines is conducted at _______________

(a) No-load

(b) Part load

(c) Full-load

(d) Overload

This question was posed to me during an internship interview.

Origin of the question is Hopkinson’s Test topic in chapter Efficiency and Testing of DC Machines

1 Answer

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Best answer
Right answer is (c) Full-load

The best I can explain: Unlike Swinburne’s test Hopkinson’s test is carried out at loaded condition. Thus, we get stray load loss also, while finding out the efficiency. Hence, efficiency is not over-estimated like Swinburne’s test.

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