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In field’s test generator field and motor field are connected in ______________

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In field’s test generator field and motor field are connected in ______________

(a) Series

(b) Parallel

(c) Alternatively, series and parallel

(d) Not connected

I had been asked this question during a job interview.

The doubt is from Hopkinson’s Test topic in section Efficiency and Testing of DC Machines

1 Answer

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Best answer
The correct choice is (a) Series

Best explanation: The generator field is connected in series with motor field circuit. The generator is thus separately excited and its excitation is identical to that of motor at all loads. This ensures that the iron-loss of both the machines are always equal.

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