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External methods of induction motor starting is employed to __________

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External methods of induction motor starting is employed to __________

(a) Reduce the voltage

(b) Reduce the current

(c) Improve efficiency

(d) All of the mentioned

This question was addressed to me in class test.

Enquiry is from Starting of Polyphase Induction Motors-I topic in section Starting of Induction Motors of Electrical Machines

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Best answer
The correct option is (a) Reduce the voltage

Explanation: External methods like auto transformer is used to mainly reduce voltage.

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