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What is the speed of the turbo-alternators?

(a) 100-1000 rpm

(b) 5000 rpm

(c) 1500 rpm

(d) 3000 rpm

This question was addressed to me in exam.

The above asked question is from Types of Synchronous Machines in division Design of Synchronous Machines of Design of Electrical Machines

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Right answer is (d) 3000 rpm

For explanation: The turbo alternators are one category among the synchronous machines. They are driven by steam turbines. The rating of the turbo-alternators is 3000 rpm.

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