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By how many minutes is the complete energy of the rotating parts and the machine is brought to rest?

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in Design of Electrical Machines by (687k points)
By how many minutes is the complete energy of the rotating parts and the machine is brought to rest?

(a) 2 minutes

(b) 1 minute

(c) 3 minutes

(d) 4 minutes

I had been asked this question during an interview.

My doubt is from Construction of Hydro-Generators in division Design of Synchronous Machines of Design of Electrical Machines

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Correct option is (c) 3 minutes

The explanation: The brakes are so designed such that the complete energy of the rotating parts and the machine is brought to rest. It is brought to rest by 3 minutes.

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