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The brushless excitation and conventional DC excitation systems are comparable but one significant change is _______

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The brushless  excitation and conventional DC excitation systems are comparable but one significant change is _______

(a) pilot exciter is brushless permanent magnet motor

(b) three phase rectifier feeds directly to main exciter

(c) a three phase rectifier is fed by main exciter

(d) no direct rectification is provided to the pilot exciter

This question was addressed to me by my college director while I was bunking the class.

Asked question is from Excitation Systems for Synchronous Machines topic in section Synchronous Machines of Electrical Machines

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Correct choice is (a) pilot exciter is brushless permanent magnet motor

For explanation: The brushless excitation involves a brushless permanent motor which acts as an auxiliary exciter.

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