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For what peripheral speed is the poles bolted to the yoke?

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For what peripheral speed is the poles bolted to the yoke?

(a) 20 m per s

(b) 30 m per s

(c) 25 m per s

(d) 27 m per s

This question was addressed to me in semester exam.

This key question is from Construction of Hydro-Generators topic in chapter Design of Synchronous Machines of Design of Electrical Machines

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The correct answer is (c) 25 m per s

The best explanation: The poles are clamped or fixed to the rim in different ways. In case of the generators the poles are bolted to the yoke when the peripheral speed is upto 25 m per s.

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