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______ alternator is used in thermal stations and ______ alternator is used in hydel plants.

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______ alternator is used in thermal stations and ______ alternator is used in hydel plants.

(a) Cylindrical-rotor, salient pole

(b) Salinet pole, cylindrical-rotor

(c) Salient pole, Reluctance

(d) Cylindrical-rotor, cylindrical-rotor

I had been asked this question in an interview for job.

Query is from Synchronous Machine Applications in section Synchronous Machines of Electrical Machines

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The correct choice is (a) Cylindrical-rotor, salient pole

The explanation: Due to salient poles, the machine will not run at very large speed and it becomes less rugged.

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