Why field test is conducted even if Hopkinson’s test is present?

Why field test is conducted even if Hopkinson’s test is present? Correct Answer Both instability and possibility of run-away speed

Regenerative test on two identical series motors is not feasible because of instability of such an operation and the possibility of run-away speed. Therefore, we have toconduct a loading test.

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Hopkinson's test on D.C. machines is conducted at
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