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Hopkinson’s test is also called regenerative test due to ____________

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Hopkinson’s test is also called regenerative test due to ____________

(a) energy of one machine is used to drive other

(b) feedback

(c) losses are least

(d) extra motor is used

This question was posed to me in final exam.

Origin of the question is Efficiency and Testing of DC Machines in chapter DC Machines of Electrical Machines

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Correct answer is (a) energy of one machine is used to drive other

The explanation is: Regenerative phenomena utilizes the energy of the running machine to tap the dynamically produced energy and use it to charge the battery.

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