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'Speed' is only one of the factors that determine the output voltage of an a.c. generator, so your question cannot be answered. In practise, speed is more important establishing frequency rather than voltage.

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10y ago
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10y ago

A 50 Hz alternator runs at 3000 rpm.

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In North America a 4 pole 60 Hz standby generator operates at 1800 RPM. This speed is used for generators in the 25 kW to 2000 kW range.

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Q: What is the RPM for ac generator to get 240 volt?
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