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In what type of generator is the thick rolled steel discs made use of?

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in Design of Electrical Machines by (687k points)
In what type of generator is the thick rolled steel discs made use of?

(a) generators running at 400 rpm

(b) generators running at 500 rpm

(c) generators running at 600 rpm

(d) generators running at 600 rpm and above

I got this question in an online interview.

Enquiry is from Construction of Hydro-Generators topic in section Design of Synchronous Machines of Design of Electrical Machines

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Right answer is (d) generators running at 600 rpm and above

For explanation I would say: Another type of rotor construction made use of in the hydro-generators is the thick rolled steel discs. It is made use for the generators running at 600 rpm and above.

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