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Similarity between Hopkinonson’s and field’s test is that _______

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Similarity between Hopkinonson’s and field’s test is that _______

(a) both need similar mechanically coupled motor

(b) both need similar electrically coupled motor

(c) regenerative power

(d) negligible power

This question was posed to me in a job interview.

Query is from Efficiency and Testing of DC Machines topic in chapter DC Machines of Electrical Machines

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The correct option is (a) both need similar mechanically coupled motor

The explanation is: The machines have to be mechanically coupled together.

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