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How are the bearing cooled in the construction?

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in Design of Electrical Machines by (687k points)
How are the bearing cooled in the construction?

(a) natural cooling

(b) forced cooling

(c) air cooling

(d) oil cooling

I have been asked this question in an interview for job.

I want to ask this question from Construction of Hydro-Generators in chapter Design of Synchronous Machines of Design of Electrical Machines

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The correct option is (d) oil cooling

The explanation: Oil is the material which is used for the cooling of the bearings. It is being supplied to the bearings by the pump.

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