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Which machine makes use of the forged steel construction?

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in Design of Electrical Machines by (687k points)
Which machine makes use of the forged steel construction?

(a) low speed

(b) high speed

(c) very high speed

(d) medium speed

This question was posed to me in a job interview.

This interesting question is from Construction of Hydro-Generators topic in division Design of Synchronous Machines of Design of Electrical Machines

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The correct option is (b) high speed

Best explanation: The forged steel construction is made use for the high speed machines. The earliest construction particularly at relatively low outputs consisted of a body and shaft extension made as single forging.

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