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A student is given a differential compound motor and he has been asked to make it start. How will he try?

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A student is given a differential compound motor and he has been asked to make it start. How will he try?

(a) By shorting series field at start

(b) To run as shunt motor at start

(c) By making rated current at start

(d) All of the mentioned

I have been asked this question in exam.

The query is from Operating Characteristics of DC Motors in chapter DC Motors of Electrical Machines

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Correct answer is (d) All of the mentioned

To explain I would say: At starting, the flux should be rated so that there is no abnormal situation arise.

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