A synchronous motor working at leading power factor can be used as

voltage booster
phase advancer
noise generator
mechanical synchronizer

The correct answer is: A. voltage booster.

A synchronous motor working at leading power factor can be used as a voltage booster because it can provide reactive power to the system. This reactive power can help to improve the power factor of the system, which can lead

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to lower losses and increased efficiency.

Option B is incorrect because a synchronous motor working at leading power factor cannot advance the phase of the voltage.

Option C is incorrect because a synchronous motor working at leading power factor does not generate noise.

Option D is incorrect because a synchronous motor working at leading power factor is not a mechanical synchronizer.

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