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Separately excited dc generators are used in __________

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Separately excited dc generators are used in __________

(a) Ward leonard system of speed control

(b) Hopkinson’s testing

(c) Voltage control

(d) None of the mentioned

This question was addressed to me in an interview for job.

My question is based upon DC Machine Applications topic in portion DC Machines of Electrical Machines

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Correct answer is (a) Ward leonard system of speed control

The explanation is: Separately excited dc generators are used in Ward leonard system of speed control.

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