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What factor does the rotor body depends upon in the construction of hydro-generators?

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What factor does the rotor body depends upon in the construction of hydro-generators?

(a) speed

(b) voltage

(c) peripheral voltage

(d) power

I got this question by my school principal while I was bunking the class.

My question is taken from Construction of Hydro-Generators in portion Design of Synchronous Machines of Design of Electrical Machines

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The correct option is (c) peripheral voltage

The explanation: In the hydro-generators the salient poles are attached to the rotor body. The type of rotor body used depends in general on the peripheral speed.

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