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Because it rotates at a constant (i.e.synchronous speed ) no matter whats the load on alternator.For instance if its a 2 pole machine it will rotate at 3000 rpm to produce a frequency of 50 Hz in India.

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Q: Why alternator are called synchronous generator?
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Related questions

How many types of AC generator are there?

Induction type alternator and synchronous generator.


What is synchronous machein?

mainly alternator,synchronous motor comes under the synchronous machine.a synchronous motor is not a self starting motor.if a synchronous motor moves with more than synchronous speed then it acts as a synchronous generator.


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when its speed becomes greater than the synchronous speed.


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