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In Hopkinson’s test, two machines are connected in ______________

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In Hopkinson’s test, two machines are connected in ______________

(a) Series

(b) Parallel

(c) Can be connected in parallel or series

(d) Two machines are not required

This question was addressed to me in a job interview.

My query is from Hopkinson’s Test in chapter Efficiency and Testing of DC Machines

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Correct option is (b) Parallel

To explain: The two machines are made parallel by means of switch S after checking that similar polarities of the machine are connected across the switch. Here, one machine is driving another machine.

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