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The voltage range for large turbo-alternators typically varies but commonly falls within the range of 10,000 volts (10 kV) to as high as 30,000 volts (30 kV) or more. These voltage levels are directly related to the alternator’s design and the requirements of the electrical grid or application they are intended for. High voltage levels are used to efficiently transmit electricity over long distances with minimal losses.
Answer: d
Explanation: The generation voltage normally used are 15 kV for 100-200 MW
machines. The voltage range for the large turbo-alternators are 20-25 kV.