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Auxiliary method of starting is not possib1e due to the fact that ____________

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Auxiliary method of starting is not possib1e due to the fact that ____________

(a) it can not be started under load

(b) it can be only started under load

(c) it is less efficient

(d) all of the mentioned

I have been asked this question during an online exam.

I would like to ask this question from Starting of Synchronous Motors topic in section Synchronous Motors of Electrical Machines

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The correct choice is (a) it can not be started under load

Easiest explanation: Auxiliary motors usually reduces the performance indices of the synchronous machine when started under load.

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